hi,
adding the support to have buildid stored in mmap2 event,
so we can bypass the final perf record hunt on build ids.
This patchset allows perf to record build ID in mmap2 event,
and adds perf tooling to store/download binaries to .debug
cache based on these build IDs.
Note that the build id retrieval code is stolen from bpf
code, where it's been used (together with file offsets)
to replace IPs in user space stack traces. It's now added
under lib directory.
On recording server:
- on the recording server we can run record with --buildid-mmap
option to store build ids in mmap2 events:
# perf record --buildid-mmap
^C[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.836 MB perf.data ]
- it stores nothing to ~/.debug cache:
# find ~/.debug
find: ‘/root/.debug’: No such file or directory
- and still reports properly:
# perf report --stdio
...
99.82% swapper [kernel.kallsyms] [k] native_safe_halt
0.03% swapper [kernel.kallsyms] [k] finish_task_switch
0.02% swapper [kernel.kallsyms] [k] __softirqentry_text_start
0.01% kcompactd0 [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore
0.01% ksoftirqd/6 [kernel.kallsyms] [k] slab_free_freelist_hook
0.01% kworker/17:1H-x [kernel.kallsyms] [k] slab_free_freelist_hook
- display used/hit build ids:
# perf buildid-list | head -5
5dcec522abf136fcfd3128f47e131f2365834dd7 /proc/kcore
589e403a34f55486bcac848a45e00bcdeedd1ca8 /usr/lib64/libcrypto.so.1.1.1g
94569566d4eac7e9c87ba029d43d4e2158f9527e /usr/lib64/libpthread-2.30.so
559b9702bebe31c6d132c8dc5cc887673d65d5b5 /usr/lib64/libc-2.30.so
40da7abe89f631f60538a17686a7d65c6a02ed31 /usr/lib64/ld-2.30.so
- store build id binaries into build id cache:
# perf buildid-cache -a perf.data
OK 5dcec522abf136fcfd3128f47e131f2365834dd7 /proc/kcore
OK 589e403a34f55486bcac848a45e00bcdeedd1ca8 /usr/lib64/libcrypto.so.1.1.1g
OK 94569566d4eac7e9c87ba029d43d4e2158f9527e /usr/lib64/libpthread-2.30.so
OK 559b9702bebe31c6d132c8dc5cc887673d65d5b5 /usr/lib64/libc-2.30.so
OK 40da7abe89f631f60538a17686a7d65c6a02ed31 /usr/lib64/ld-2.30.so
OK a674f7a47c78e35a088104647b9640710277b489 /usr/sbin/sshd
OK e5cb4ca25f46485bdbc691c3a92e7e111dac3ef2 /usr/bin/bash
OK 9bc8589108223c944b452f0819298a0c3cba6215 /usr/bin/find
# find ~/.debug | head -5
/root/.debug
/root/.debug/proc
/root/.debug/proc/kcore
/root/.debug/proc/kcore/5dcec522abf136fcfd3128f47e131f2365834dd7
/root/.debug/proc/kcore/5dcec522abf136fcfd3128f47e131f2365834dd7/kallsyms
- run debuginfod daemon to provide binaries to another server (below)
# debuginfod -F /
On another server:
- copy perf.data from 'record' server and run:
$ find ~/.debug/
find: ‘/home/jolsa/.debug/’: No such file or directory
$ perf buildid-list | head -5
No kallsyms or vmlinux with build-id 5dcec522abf136fcfd3128f47e131f2365834dd7 was found
5dcec522abf136fcfd3128f47e131f2365834dd7 [kernel.kallsyms]
5784f813b727a50cfd3363234aef9fcbab685cc4 /lib/modules/5.10.0-rc2speed+/kernel/fs/xfs/xfs.ko
589e403a34f55486bcac848a45e00bcdeedd1ca8 /usr/lib64/libcrypto.so.1.1.1g
94569566d4eac7e9c87ba029d43d4e2158f9527e /usr/lib64/libpthread-2.30.so
559b9702bebe31c6d132c8dc5cc887673d65d5b5 /usr/lib64/libc-2.30.so
- report does not show anything (kernel build id does not match):
$ perf report --stdio
...
76.73% swapper [kernel.kallsyms] [k] 0xffffffff81aa8ebe
1.89% find [kernel.kallsyms] [k] 0xffffffff810f2167
0.93% sshd [kernel.kallsyms] [k] 0xffffffff8153380c
0.83% swapper [kernel.kallsyms] [k] 0xffffffff81104b0b
0.71% kworker/u40:2-e [kernel.kallsyms] [k] 0xffffffff810f3850
0.70% kworker/u40:0-e [kernel.kallsyms] [k] 0xffffffff810f3850
0.64% find [kernel.kallsyms] [k] 0xffffffff81a9ba0a
0.63% find [kernel.kallsyms] [k] 0xffffffff81aa93b0
- add build ids does not work, because existing binaries (on another server)
have different build ids:
$ perf buildid-cache -a perf.data
No kallsyms or vmlinux with build-id 5dcec522abf136fcfd3128f47e131f2365834dd7 was found
FAIL 5dcec522abf136fcfd3128f47e131f2365834dd7 [kernel.kallsyms]
FAIL 5784f813b727a50cfd3363234aef9fcbab685cc4 /lib/modules/5.10.0-rc2speed+/kernel/fs/xfs/xfs.ko
FAIL 589e403a34f55486bcac848a45e00bcdeedd1ca8 /usr/lib64/libcrypto.so.1.1.1g
FAIL 94569566d4eac7e9c87ba029d43d4e2158f9527e /usr/lib64/libpthread-2.30.so
FAIL 559b9702bebe31c6d132c8dc5cc887673d65d5b5 /usr/lib64/libc-2.30.so
FAIL 40da7abe89f631f60538a17686a7d65c6a02ed31 /usr/lib64/ld-2.30.so
FAIL a674f7a47c78e35a088104647b9640710277b489 /usr/sbin/sshd
FAIL e5cb4ca25f46485bdbc691c3a92e7e111dac3ef2 /usr/bin/bash
FAIL 9bc8589108223c944b452f0819298a0c3cba6215 /usr/bin/find
- add build ids with debuginfod setup pointing to record server:
$ perf buildid-cache -a perf.data --debuginfod http://192.168.122.174:8002
No kallsyms or vmlinux with build-id 5dcec522abf136fcfd3128f47e131f2365834dd7 was found
OK 5dcec522abf136fcfd3128f47e131f2365834dd7 [kernel.kallsyms]
OK 5784f813b727a50cfd3363234aef9fcbab685cc4 /lib/modules/5.10.0-rc2speed+/kernel/fs/xfs/xfs.ko
OK 589e403a34f55486bcac848a45e00bcdeedd1ca8 /usr/lib64/libcrypto.so.1.1.1g
OK 94569566d4eac7e9c87ba029d43d4e2158f9527e /usr/lib64/libpthread-2.30.so
OK 559b9702bebe31c6d132c8dc5cc887673d65d5b5 /usr/lib64/libc-2.30.so
OK 40da7abe89f631f60538a17686a7d65c6a02ed31 /usr/lib64/ld-2.30.so
OK a674f7a47c78e35a088104647b9640710277b489 /usr/sbin/sshd
OK e5cb4ca25f46485bdbc691c3a92e7e111dac3ef2 /usr/bin/bash
OK 9bc8589108223c944b452f0819298a0c3cba6215 /usr/bin/find
- and report works:
$ perf report --stdio
...
76.73% swapper [kernel.kallsyms] [k] native_safe_halt
1.91% find [kernel.kallsyms] [k] queue_work_on
0.93% sshd [kernel.kallsyms] [k] iowrite16
0.83% swapper [kernel.kallsyms] [k] finish_task_switch
0.72% kworker/u40:2-e [kernel.kallsyms] [k] process_one_work
0.70% kworker/u40:0-e [kernel.kallsyms] [k] process_one_work
0.64% find [kernel.kallsyms] [k] syscall_enter_from_user_mode
0.63% find [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore
- because we have the data in build id cache:
$ find ~/.debug | head -10
.../.debug
.../.debug/home
.../.debug/home/jolsa
.../.debug/home/jolsa/.cache
.../.debug/home/jolsa/.cache/debuginfod_client
.../.debug/home/jolsa/.cache/debuginfod_client/5dcec522abf136fcfd3128f47e131f2365834dd7
.../.debug/home/jolsa/.cache/debuginfod_client/5dcec522abf136fcfd3128f47e131f2365834dd7/executable
.../.debug/home/jolsa/.cache/debuginfod_client/5dcec522abf136fcfd3128f47e131f2365834dd7/executable/5dcec522abf136fcfd3128f47e131f2365834dd7
.../.debug/home/jolsa/.cache/debuginfod_client/5dcec522abf136fcfd3128f47e131f2365834dd7/executable/5dcec522abf136fcfd3128f47e131f2365834dd7/elf
.../.debug/home/jolsa/.cache/debuginfod_client/5dcec522abf136fcfd3128f47e131f2365834dd7/executable/5dcec522abf136fcfd3128f47e131f2365834dd7/debug
Available also in:
git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
perf/build_id
thanks,
jirka
Cc: Frank Ch. Eigler <[email protected]>
Cc: Mark Wielaard <[email protected]>
---
Jiri Olsa (24):
bpf: Move stack_map_get_build_id into lib
bpf: Add build_id_parse_size function
perf: Add build id data in mmap2 event
tools headers uapi: Sync tools/include/uapi/linux/perf_event.h
perf tools: Do not swap mmap2 fields in case it contains build id
perf tools: Add build_id__is_defined function
perf tools: Add filename__decompress function
perf tools: Add support to read build id from compressed elf
perf tools: Add check for existing link in buildid dir
perf tools: Use struct extra_kernel_map in machine__process_kernel_mmap_event
perf tools: Try to load vmlinux from buildid database
perf tools: Store build id from mmap2 events
perf tools: Allow mmap2 event to synthesize kernel image
perf tools: Allow mmap2 event to synthesize modules
perf tools: Synthesize build id for kernel/modules/tasks
perf tools: Add support to display build id for mmap2 events
perf tools: Use machine__for_each_dso in perf_session__cache_build_ids
perf tools: Add __perf_session__cache_build_ids function
perf tools: Add is_perf_data function
perf tools: Add build_id_cache__add function
perf buildid-cache: Add support to add build ids from perf data
perf buildid-cache: Add --debuginfod option
perf buildid-list: Add support for mmap2's buildid events
perf record: Add --buildid-mmap option to enable mmap's build id
include/linux/buildid.h | 13 +++++++
include/uapi/linux/perf_event.h | 26 ++++++++++---
kernel/bpf/stackmap.c | 143 ++-----------------------------------------------------------------
kernel/events/core.c | 31 +++++++++++++--
lib/Makefile | 3 +-
lib/buildid.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/include/uapi/linux/perf_event.h | 26 ++++++++++---
tools/lib/perf/include/perf/event.h | 18 +++++++--
tools/perf/Documentation/perf-buildid-cache.txt | 16 +++++++-
tools/perf/Documentation/perf-record.txt | 3 ++
tools/perf/builtin-buildid-cache.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
tools/perf/builtin-buildid-list.c | 3 ++
tools/perf/builtin-record.c | 20 ++++++++++
tools/perf/tests/shell/trace+probe_vfs_getname.sh | 2 +-
tools/perf/util/build-id.c | 124 +++++++++++++++++++++++++++++++++++++---------------------
tools/perf/util/build-id.h | 8 ++++
tools/perf/util/data.c | 19 +++++++++
tools/perf/util/data.h | 1 +
tools/perf/util/dso.c | 31 +++++++++------
tools/perf/util/dso.h | 2 +
tools/perf/util/event.c | 41 +++++++++++++------
tools/perf/util/evsel.c | 10 +++--
tools/perf/util/machine.c | 80 ++++++++++++++++++++++---------------
tools/perf/util/map.c | 8 +++-
tools/perf/util/map.h | 3 +-
tools/perf/util/perf_api_probe.c | 10 +++++
tools/perf/util/perf_api_probe.h | 1 +
tools/perf/util/perf_event_attr_fprintf.c | 1 +
tools/perf/util/probe-event.c | 6 +--
tools/perf/util/record.h | 1 +
tools/perf/util/session.c | 11 ++++--
tools/perf/util/symbol-elf.c | 37 +++++++++++++++++-
tools/perf/util/symbol.c | 16 ++++++++
tools/perf/util/symbol_conf.h | 3 +-
tools/perf/util/synthetic-events.c | 122 +++++++++++++++++++++++++++++++++++++++++++--------------
35 files changed, 918 insertions(+), 310 deletions(-)
create mode 100644 include/linux/buildid.h
create mode 100644 lib/buildid.c
Moving stack_map_get_build_id into lib with
declaration in linux/buildid.h header:
int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id);
This function returns build id for given struct vm_area_struct.
There is no functional change to stack_map_get_build_id function.
Cc: Alexei Starovoitov <[email protected]>
Acked-by: Song Liu <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
---
include/linux/buildid.h | 11 ++++
kernel/bpf/stackmap.c | 143 ++--------------------------------------
lib/Makefile | 3 +-
lib/buildid.c | 136 ++++++++++++++++++++++++++++++++++++++
4 files changed, 153 insertions(+), 140 deletions(-)
create mode 100644 include/linux/buildid.h
create mode 100644 lib/buildid.c
diff --git a/include/linux/buildid.h b/include/linux/buildid.h
new file mode 100644
index 000000000000..3be5b49719f1
--- /dev/null
+++ b/include/linux/buildid.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_BUILDID_H
+#define _LINUX_BUILDID_H
+
+#include <linux/mm_types.h>
+
+#define BUILD_ID_SIZE 20
+
+int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id);
+
+#endif
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 06065fa27124..7df08f8af5a1 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -7,10 +7,9 @@
#include <linux/kernel.h>
#include <linux/stacktrace.h>
#include <linux/perf_event.h>
-#include <linux/elf.h>
-#include <linux/pagemap.h>
#include <linux/irq_work.h>
#include <linux/btf_ids.h>
+#include <linux/buildid.h>
#include "percpu_freelist.h"
#define STACK_CREATE_FLAG_MASK \
@@ -153,140 +152,6 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
return ERR_PTR(err);
}
-#define BPF_BUILD_ID 3
-/*
- * Parse build id from the note segment. This logic can be shared between
- * 32-bit and 64-bit system, because Elf32_Nhdr and Elf64_Nhdr are
- * identical.
- */
-static inline int stack_map_parse_build_id(void *page_addr,
- unsigned char *build_id,
- void *note_start,
- Elf32_Word note_size)
-{
- Elf32_Word note_offs = 0, new_offs;
-
- /* check for overflow */
- if (note_start < page_addr || note_start + note_size < note_start)
- return -EINVAL;
-
- /* only supports note that fits in the first page */
- if (note_start + note_size > page_addr + PAGE_SIZE)
- return -EINVAL;
-
- while (note_offs + sizeof(Elf32_Nhdr) < note_size) {
- Elf32_Nhdr *nhdr = (Elf32_Nhdr *)(note_start + note_offs);
-
- if (nhdr->n_type == BPF_BUILD_ID &&
- nhdr->n_namesz == sizeof("GNU") &&
- nhdr->n_descsz > 0 &&
- nhdr->n_descsz <= BPF_BUILD_ID_SIZE) {
- memcpy(build_id,
- note_start + note_offs +
- ALIGN(sizeof("GNU"), 4) + sizeof(Elf32_Nhdr),
- nhdr->n_descsz);
- memset(build_id + nhdr->n_descsz, 0,
- BPF_BUILD_ID_SIZE - nhdr->n_descsz);
- return 0;
- }
- new_offs = note_offs + sizeof(Elf32_Nhdr) +
- ALIGN(nhdr->n_namesz, 4) + ALIGN(nhdr->n_descsz, 4);
- if (new_offs <= note_offs) /* overflow */
- break;
- note_offs = new_offs;
- }
- return -EINVAL;
-}
-
-/* Parse build ID from 32-bit ELF */
-static int stack_map_get_build_id_32(void *page_addr,
- unsigned char *build_id)
-{
- Elf32_Ehdr *ehdr = (Elf32_Ehdr *)page_addr;
- Elf32_Phdr *phdr;
- int i;
-
- /* only supports phdr that fits in one page */
- if (ehdr->e_phnum >
- (PAGE_SIZE - sizeof(Elf32_Ehdr)) / sizeof(Elf32_Phdr))
- return -EINVAL;
-
- phdr = (Elf32_Phdr *)(page_addr + sizeof(Elf32_Ehdr));
-
- for (i = 0; i < ehdr->e_phnum; ++i) {
- if (phdr[i].p_type == PT_NOTE &&
- !stack_map_parse_build_id(page_addr, build_id,
- page_addr + phdr[i].p_offset,
- phdr[i].p_filesz))
- return 0;
- }
- return -EINVAL;
-}
-
-/* Parse build ID from 64-bit ELF */
-static int stack_map_get_build_id_64(void *page_addr,
- unsigned char *build_id)
-{
- Elf64_Ehdr *ehdr = (Elf64_Ehdr *)page_addr;
- Elf64_Phdr *phdr;
- int i;
-
- /* only supports phdr that fits in one page */
- if (ehdr->e_phnum >
- (PAGE_SIZE - sizeof(Elf64_Ehdr)) / sizeof(Elf64_Phdr))
- return -EINVAL;
-
- phdr = (Elf64_Phdr *)(page_addr + sizeof(Elf64_Ehdr));
-
- for (i = 0; i < ehdr->e_phnum; ++i) {
- if (phdr[i].p_type == PT_NOTE &&
- !stack_map_parse_build_id(page_addr, build_id,
- page_addr + phdr[i].p_offset,
- phdr[i].p_filesz))
- return 0;
- }
- return -EINVAL;
-}
-
-/* Parse build ID of ELF file mapped to vma */
-static int stack_map_get_build_id(struct vm_area_struct *vma,
- unsigned char *build_id)
-{
- Elf32_Ehdr *ehdr;
- struct page *page;
- void *page_addr;
- int ret;
-
- /* only works for page backed storage */
- if (!vma->vm_file)
- return -EINVAL;
-
- page = find_get_page(vma->vm_file->f_mapping, 0);
- if (!page)
- return -EFAULT; /* page not mapped */
-
- ret = -EINVAL;
- page_addr = kmap_atomic(page);
- ehdr = (Elf32_Ehdr *)page_addr;
-
- /* compare magic x7f "ELF" */
- if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0)
- goto out;
-
- /* only support executable file and shared object file */
- if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN)
- goto out;
-
- if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
- ret = stack_map_get_build_id_32(page_addr, build_id);
- else if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
- ret = stack_map_get_build_id_64(page_addr, build_id);
-out:
- kunmap_atomic(page_addr);
- put_page(page);
- return ret;
-}
-
static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
u64 *ips, u32 trace_nr, bool user)
{
@@ -327,18 +192,18 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
for (i = 0; i < trace_nr; i++) {
id_offs[i].status = BPF_STACK_BUILD_ID_IP;
id_offs[i].ip = ips[i];
- memset(id_offs[i].build_id, 0, BPF_BUILD_ID_SIZE);
+ memset(id_offs[i].build_id, 0, BUILD_ID_SIZE);
}
return;
}
for (i = 0; i < trace_nr; i++) {
vma = find_vma(current->mm, ips[i]);
- if (!vma || stack_map_get_build_id(vma, id_offs[i].build_id)) {
+ if (!vma || build_id_parse(vma, id_offs[i].build_id)) {
/* per entry fall back to ips */
id_offs[i].status = BPF_STACK_BUILD_ID_IP;
id_offs[i].ip = ips[i];
- memset(id_offs[i].build_id, 0, BPF_BUILD_ID_SIZE);
+ memset(id_offs[i].build_id, 0, BUILD_ID_SIZE);
continue;
}
id_offs[i].offset = (vma->vm_pgoff << PAGE_SHIFT) + ips[i]
diff --git a/lib/Makefile b/lib/Makefile
index ce45af50983a..f4858f5e9215 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -36,7 +36,8 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
flex_proportions.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
- nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o
+ nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o \
+ buildid.o
lib-$(CONFIG_PRINTK) += dump_stack.o
lib-$(CONFIG_SMP) += cpumask.o
diff --git a/lib/buildid.c b/lib/buildid.c
new file mode 100644
index 000000000000..e8d5feb7ef20
--- /dev/null
+++ b/lib/buildid.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/buildid.h>
+#include <linux/elf.h>
+#include <linux/pagemap.h>
+
+#define BUILD_ID 3
+/*
+ * Parse build id from the note segment. This logic can be shared between
+ * 32-bit and 64-bit system, because Elf32_Nhdr and Elf64_Nhdr are
+ * identical.
+ */
+static inline int parse_build_id(void *page_addr,
+ unsigned char *build_id,
+ void *note_start,
+ Elf32_Word note_size)
+{
+ Elf32_Word note_offs = 0, new_offs;
+
+ /* check for overflow */
+ if (note_start < page_addr || note_start + note_size < note_start)
+ return -EINVAL;
+
+ /* only supports note that fits in the first page */
+ if (note_start + note_size > page_addr + PAGE_SIZE)
+ return -EINVAL;
+
+ while (note_offs + sizeof(Elf32_Nhdr) < note_size) {
+ Elf32_Nhdr *nhdr = (Elf32_Nhdr *)(note_start + note_offs);
+
+ if (nhdr->n_type == BUILD_ID &&
+ nhdr->n_namesz == sizeof("GNU") &&
+ nhdr->n_descsz > 0 &&
+ nhdr->n_descsz <= BUILD_ID_SIZE) {
+ memcpy(build_id,
+ note_start + note_offs +
+ ALIGN(sizeof("GNU"), 4) + sizeof(Elf32_Nhdr),
+ nhdr->n_descsz);
+ memset(build_id + nhdr->n_descsz, 0,
+ BUILD_ID_SIZE - nhdr->n_descsz);
+ return 0;
+ }
+ new_offs = note_offs + sizeof(Elf32_Nhdr) +
+ ALIGN(nhdr->n_namesz, 4) + ALIGN(nhdr->n_descsz, 4);
+ if (new_offs <= note_offs) /* overflow */
+ break;
+ note_offs = new_offs;
+ }
+ return -EINVAL;
+}
+
+/* Parse build ID from 32-bit ELF */
+static int get_build_id_32(void *page_addr, unsigned char *build_id)
+{
+ Elf32_Ehdr *ehdr = (Elf32_Ehdr *)page_addr;
+ Elf32_Phdr *phdr;
+ int i;
+
+ /* only supports phdr that fits in one page */
+ if (ehdr->e_phnum >
+ (PAGE_SIZE - sizeof(Elf32_Ehdr)) / sizeof(Elf32_Phdr))
+ return -EINVAL;
+
+ phdr = (Elf32_Phdr *)(page_addr + sizeof(Elf32_Ehdr));
+
+ for (i = 0; i < ehdr->e_phnum; ++i) {
+ if (phdr[i].p_type == PT_NOTE &&
+ !parse_build_id(page_addr, build_id,
+ page_addr + phdr[i].p_offset,
+ phdr[i].p_filesz))
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/* Parse build ID from 64-bit ELF */
+static int get_build_id_64(void *page_addr, unsigned char *build_id)
+{
+ Elf64_Ehdr *ehdr = (Elf64_Ehdr *)page_addr;
+ Elf64_Phdr *phdr;
+ int i;
+
+ /* only supports phdr that fits in one page */
+ if (ehdr->e_phnum >
+ (PAGE_SIZE - sizeof(Elf64_Ehdr)) / sizeof(Elf64_Phdr))
+ return -EINVAL;
+
+ phdr = (Elf64_Phdr *)(page_addr + sizeof(Elf64_Ehdr));
+
+ for (i = 0; i < ehdr->e_phnum; ++i) {
+ if (phdr[i].p_type == PT_NOTE &&
+ !parse_build_id(page_addr, build_id,
+ page_addr + phdr[i].p_offset,
+ phdr[i].p_filesz))
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/* Parse build ID of ELF file mapped to vma */
+int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id)
+{
+ Elf32_Ehdr *ehdr;
+ struct page *page;
+ void *page_addr;
+ int ret;
+
+ /* only works for page backed storage */
+ if (!vma->vm_file)
+ return -EINVAL;
+
+ page = find_get_page(vma->vm_file->f_mapping, 0);
+ if (!page)
+ return -EFAULT; /* page not mapped */
+
+ ret = -EINVAL;
+ page_addr = kmap_atomic(page);
+ ehdr = (Elf32_Ehdr *)page_addr;
+
+ /* compare magic x7f "ELF" */
+ if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0)
+ goto out;
+
+ /* only support executable file and shared object file */
+ if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN)
+ goto out;
+
+ if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
+ ret = get_build_id_32(page_addr, build_id);
+ else if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
+ ret = get_build_id_64(page_addr, build_id);
+out:
+ kunmap_atomic(page_addr);
+ put_page(page);
+ return ret;
+}
--
2.26.2
Adding support to carry build id data in mmap2 event.
The build id data replaces maj/min/ino/ino_generation
fields, whichc are also used to identify map's binary,
so it's ok to replace them with build id data:
union {
struct {
u32 maj;
u32 min;
u64 ino;
u64 ino_generation;
};
struct {
u8 build_id[20];
u8 build_id_size;
u8 __reserved_1;
u16 __reserved_2;
};
};
Replaced maj/min/ino/ino_generation fields give us size
of 24 bytes. We use 20 bytes for build id data, 1 byte
for size and rest is unused.
There's new misc bit for mmap2 to signal there's build
id data in it:
#define PERF_RECORD_MISC_BUILD_ID (1 << 14)
Signed-off-by: Jiri Olsa <[email protected]>
---
include/uapi/linux/perf_event.h | 26 +++++++++++++++++++++-----
kernel/events/core.c | 31 +++++++++++++++++++++++++++----
2 files changed, 48 insertions(+), 9 deletions(-)
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index b95d3c485d27..b6caf61bf9fd 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -384,7 +384,8 @@ struct perf_event_attr {
aux_output : 1, /* generate AUX records instead of events */
cgroup : 1, /* include cgroup events */
text_poke : 1, /* include text poke events */
- __reserved_1 : 30;
+ build_id : 1, /* use build id in mmap2 events */
+ __reserved_1 : 29;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -688,6 +689,7 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_EXACT_IP - PERF_RECORD_SAMPLE of precise events
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT - PERF_RECORD_SWITCH* events
+ * PERF_RECORD_MISC_BUILD_ID - PERF_RECORD_MMAP2 event
*
*
* PERF_RECORD_MISC_EXACT_IP:
@@ -697,9 +699,13 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT:
* Indicates that thread was preempted in TASK_RUNNING state.
+ *
+ * PERF_RECORD_MISC_BUILD_ID:
+ * Indicates that mmap2 event carries build id data.
*/
#define PERF_RECORD_MISC_EXACT_IP (1 << 14)
#define PERF_RECORD_MISC_SWITCH_OUT_PREEMPT (1 << 14)
+#define PERF_RECORD_MISC_BUILD_ID (1 << 14)
/*
* Reserve the last bit to indicate some extended misc field
*/
@@ -911,10 +917,20 @@ enum perf_event_type {
* u64 addr;
* u64 len;
* u64 pgoff;
- * u32 maj;
- * u32 min;
- * u64 ino;
- * u64 ino_generation;
+ * union {
+ * struct {
+ * u32 maj;
+ * u32 min;
+ * u64 ino;
+ * u64 ino_generation;
+ * };
+ * struct {
+ * u8 build_id[20];
+ * u8 build_id_size;
+ * u8 __reserved_1;
+ * u16 __reserved_2;
+ * };
+ * };
* u32 prot, flags;
* char filename[];
* struct sample_id sample_id;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index da467e1dd49a..808473b6ce85 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -51,6 +51,7 @@
#include <linux/proc_ns.h>
#include <linux/mount.h>
#include <linux/min_heap.h>
+#include <linux/buildid.h>
#include "internal.h"
@@ -395,6 +396,7 @@ static atomic_t nr_ksymbol_events __read_mostly;
static atomic_t nr_bpf_events __read_mostly;
static atomic_t nr_cgroup_events __read_mostly;
static atomic_t nr_text_poke_events __read_mostly;
+static atomic_t nr_build_id_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4672,6 +4674,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (event->attr.mmap || event->attr.mmap_data)
atomic_dec(&nr_mmap_events);
+ if (event->attr.build_id)
+ atomic_dec(&nr_build_id_events);
if (event->attr.comm)
atomic_dec(&nr_comm_events);
if (event->attr.namespaces)
@@ -7942,6 +7946,8 @@ struct perf_mmap_event {
u64 ino;
u64 ino_generation;
u32 prot, flags;
+ u8 build_id[BUILD_ID_SIZE];
+ u32 build_id_size;
struct {
struct perf_event_header header;
@@ -7997,13 +8003,23 @@ static void perf_event_mmap_output(struct perf_event *event,
mmap_event->event_id.pid = perf_event_pid(event, current);
mmap_event->event_id.tid = perf_event_tid(event, current);
+ if (event->attr.mmap2 && event->attr.build_id)
+ mmap_event->event_id.header.misc |= PERF_RECORD_MISC_BUILD_ID;
+
perf_output_put(&handle, mmap_event->event_id);
if (event->attr.mmap2) {
- perf_output_put(&handle, mmap_event->maj);
- perf_output_put(&handle, mmap_event->min);
- perf_output_put(&handle, mmap_event->ino);
- perf_output_put(&handle, mmap_event->ino_generation);
+ if (event->attr.build_id) {
+ u8 size[4] = { (u8) mmap_event->build_id_size, 0, 0, 0 };
+
+ __output_copy(&handle, mmap_event->build_id, BUILD_ID_SIZE);
+ __output_copy(&handle, size, 4);
+ } else {
+ perf_output_put(&handle, mmap_event->maj);
+ perf_output_put(&handle, mmap_event->min);
+ perf_output_put(&handle, mmap_event->ino);
+ perf_output_put(&handle, mmap_event->ino_generation);
+ }
perf_output_put(&handle, mmap_event->prot);
perf_output_put(&handle, mmap_event->flags);
}
@@ -8132,6 +8148,11 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
+ if (atomic_read(&nr_build_id_events)) {
+ build_id_parse_size(vma, mmap_event->build_id,
+ &mmap_event->build_id_size);
+ }
+
perf_iterate_sb(perf_event_mmap_output,
mmap_event,
NULL);
@@ -11069,6 +11090,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (event->attr.mmap || event->attr.mmap_data)
atomic_inc(&nr_mmap_events);
+ if (event->attr.build_id)
+ atomic_inc(&nr_build_id_events);
if (event->attr.comm)
atomic_inc(&nr_comm_events);
if (event->attr.namespaces)
--
2.26.2
It's possible to have other build id types (other than default
SHA1). Currently there's also ld support for MD5 build id.
Adding build_id_parse_size function, that returns also size of
the parsed build id, so we can recognize the build id type.
Cc: Alexei Starovoitov <[email protected]>
Cc: Song Liu <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
---
include/linux/buildid.h | 2 ++
lib/buildid.c | 31 ++++++++++++++++++++++++-------
2 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/include/linux/buildid.h b/include/linux/buildid.h
index 3be5b49719f1..edba89834b4c 100644
--- a/include/linux/buildid.h
+++ b/include/linux/buildid.h
@@ -7,5 +7,7 @@
#define BUILD_ID_SIZE 20
int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id);
+int build_id_parse_size(struct vm_area_struct *vma, unsigned char *build_id,
+ __u32 *size);
#endif
diff --git a/lib/buildid.c b/lib/buildid.c
index e8d5feb7ef20..c52f86110635 100644
--- a/lib/buildid.c
+++ b/lib/buildid.c
@@ -12,6 +12,7 @@
*/
static inline int parse_build_id(void *page_addr,
unsigned char *build_id,
+ __u32 *size,
void *note_start,
Elf32_Word note_size)
{
@@ -38,6 +39,8 @@ static inline int parse_build_id(void *page_addr,
nhdr->n_descsz);
memset(build_id + nhdr->n_descsz, 0,
BUILD_ID_SIZE - nhdr->n_descsz);
+ if (size)
+ *size = nhdr->n_descsz;
return 0;
}
new_offs = note_offs + sizeof(Elf32_Nhdr) +
@@ -50,7 +53,8 @@ static inline int parse_build_id(void *page_addr,
}
/* Parse build ID from 32-bit ELF */
-static int get_build_id_32(void *page_addr, unsigned char *build_id)
+static int get_build_id_32(void *page_addr, unsigned char *build_id,
+ __u32 *size)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *)page_addr;
Elf32_Phdr *phdr;
@@ -65,7 +69,7 @@ static int get_build_id_32(void *page_addr, unsigned char *build_id)
for (i = 0; i < ehdr->e_phnum; ++i) {
if (phdr[i].p_type == PT_NOTE &&
- !parse_build_id(page_addr, build_id,
+ !parse_build_id(page_addr, build_id, size,
page_addr + phdr[i].p_offset,
phdr[i].p_filesz))
return 0;
@@ -74,7 +78,8 @@ static int get_build_id_32(void *page_addr, unsigned char *build_id)
}
/* Parse build ID from 64-bit ELF */
-static int get_build_id_64(void *page_addr, unsigned char *build_id)
+static int get_build_id_64(void *page_addr, unsigned char *build_id,
+ __u32 *size)
{
Elf64_Ehdr *ehdr = (Elf64_Ehdr *)page_addr;
Elf64_Phdr *phdr;
@@ -89,7 +94,7 @@ static int get_build_id_64(void *page_addr, unsigned char *build_id)
for (i = 0; i < ehdr->e_phnum; ++i) {
if (phdr[i].p_type == PT_NOTE &&
- !parse_build_id(page_addr, build_id,
+ !parse_build_id(page_addr, build_id, size,
page_addr + phdr[i].p_offset,
phdr[i].p_filesz))
return 0;
@@ -98,7 +103,8 @@ static int get_build_id_64(void *page_addr, unsigned char *build_id)
}
/* Parse build ID of ELF file mapped to vma */
-int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id)
+static int __build_id_parse(struct vm_area_struct *vma, unsigned char *build_id,
+ __u32 *size)
{
Elf32_Ehdr *ehdr;
struct page *page;
@@ -126,11 +132,22 @@ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id)
goto out;
if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
- ret = get_build_id_32(page_addr, build_id);
+ ret = get_build_id_32(page_addr, build_id, size);
else if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
- ret = get_build_id_64(page_addr, build_id);
+ ret = get_build_id_64(page_addr, build_id, size);
out:
kunmap_atomic(page_addr);
put_page(page);
return ret;
}
+
+int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id)
+{
+ return __build_id_parse(vma, build_id, NULL);
+}
+
+int build_id_parse_size(struct vm_area_struct *vma, unsigned char *build_id,
+ __u32 *size)
+{
+ return __build_id_parse(vma, build_id, size);
+}
--
2.26.2
Syncing tools's uapi with mmap2 build id data changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/include/uapi/linux/perf_event.h | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index b95d3c485d27..b6caf61bf9fd 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -384,7 +384,8 @@ struct perf_event_attr {
aux_output : 1, /* generate AUX records instead of events */
cgroup : 1, /* include cgroup events */
text_poke : 1, /* include text poke events */
- __reserved_1 : 30;
+ build_id : 1, /* use build id in mmap2 events */
+ __reserved_1 : 29;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -688,6 +689,7 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_EXACT_IP - PERF_RECORD_SAMPLE of precise events
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT - PERF_RECORD_SWITCH* events
+ * PERF_RECORD_MISC_BUILD_ID - PERF_RECORD_MMAP2 event
*
*
* PERF_RECORD_MISC_EXACT_IP:
@@ -697,9 +699,13 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT:
* Indicates that thread was preempted in TASK_RUNNING state.
+ *
+ * PERF_RECORD_MISC_BUILD_ID:
+ * Indicates that mmap2 event carries build id data.
*/
#define PERF_RECORD_MISC_EXACT_IP (1 << 14)
#define PERF_RECORD_MISC_SWITCH_OUT_PREEMPT (1 << 14)
+#define PERF_RECORD_MISC_BUILD_ID (1 << 14)
/*
* Reserve the last bit to indicate some extended misc field
*/
@@ -911,10 +917,20 @@ enum perf_event_type {
* u64 addr;
* u64 len;
* u64 pgoff;
- * u32 maj;
- * u32 min;
- * u64 ino;
- * u64 ino_generation;
+ * union {
+ * struct {
+ * u32 maj;
+ * u32 min;
+ * u64 ino;
+ * u64 ino_generation;
+ * };
+ * struct {
+ * u8 build_id[20];
+ * u8 build_id_size;
+ * u8 __reserved_1;
+ * u16 __reserved_2;
+ * };
+ * };
* u32 prot, flags;
* char filename[];
* struct sample_id sample_id;
--
2.26.2
If PERF_RECORD_MISC_BUILD_ID misc bit is set, mmap2
event carries build id, placed in following union:
union {
struct {
u32 maj;
u32 min;
u64 ino;
u64 ino_generation;
};
struct {
u8 build_id[20];
u8 build_id_size;
u8 __reserved_1;
u16 __reserved_2;
};
};
In this case we can't swap above fields.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/session.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 098080287c68..2891a49d3fe1 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -592,10 +592,13 @@ static void perf_event__mmap2_swap(union perf_event *event,
event->mmap2.start = bswap_64(event->mmap2.start);
event->mmap2.len = bswap_64(event->mmap2.len);
event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
- event->mmap2.maj = bswap_32(event->mmap2.maj);
- event->mmap2.min = bswap_32(event->mmap2.min);
- event->mmap2.ino = bswap_64(event->mmap2.ino);
- event->mmap2.ino_generation = bswap_64(event->mmap2.ino_generation);
+
+ if (!(event->header.misc & PERF_RECORD_MISC_BUILD_ID)) {
+ event->mmap2.maj = bswap_32(event->mmap2.maj);
+ event->mmap2.min = bswap_32(event->mmap2.min);
+ event->mmap2.ino = bswap_64(event->mmap2.ino);
+ event->mmap2.ino_generation = bswap_64(event->mmap2.ino_generation);
+ }
if (sample_id_all) {
void *data = &event->mmap2.filename;
--
2.26.2
Adding build_id__is_defined helper to check build id
is defined and is != zero build id.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 7 +++++++
tools/perf/util/build-id.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 6b410c3d52dc..7d9ecc37849c 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -912,3 +912,10 @@ void build_id__init(struct build_id *bid, const u8 *data, size_t size)
memcpy(bid->data, data, size);
bid->size = size;
}
+
+bool build_id__is_defined(const struct build_id *bid)
+{
+ static u8 zero[BUILD_ID_SIZE];
+
+ return bid && bid->size ? memcmp(bid->data, &zero, bid->size) : false;
+}
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index f293f99d5dba..d53415feaf69 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -21,6 +21,7 @@ struct feat_fd;
void build_id__init(struct build_id *bid, const u8 *data, size_t size);
int build_id__sprintf(const struct build_id *build_id, char *bf);
+bool build_id__is_defined(const struct build_id *bid);
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id);
int filename__sprintf_build_id(const char *pathname, char *sbuild_id);
char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
--
2.26.2
Factor filename__decompress from decompress_kmodule function.
It can decompress files with compressions supported in perf -
xz and gz, the support needs to be compiled in.
It will to be used in following changes to get build id out of
compressed elf objects.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/dso.c | 31 +++++++++++++++++++------------
tools/perf/util/dso.h | 2 ++
2 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 89b5fd2b5de3..d786cf6b0cfa 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -279,18 +279,12 @@ bool dso__needs_decompress(struct dso *dso)
dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
}
-static int decompress_kmodule(struct dso *dso, const char *name,
- char *pathname, size_t len)
+int filename__decompress(const char *name, char *pathname,
+ size_t len, int comp, int *err)
{
char tmpbuf[] = KMOD_DECOMP_NAME;
int fd = -1;
- if (!dso__needs_decompress(dso))
- return -1;
-
- if (dso->comp == COMP_ID__NONE)
- return -1;
-
/*
* We have proper compression id for DSO and yet the file
* behind the 'name' can still be plain uncompressed object.
@@ -304,17 +298,17 @@ static int decompress_kmodule(struct dso *dso, const char *name,
* To keep this transparent, we detect this and return the file
* descriptor to the uncompressed file.
*/
- if (!compressions[dso->comp].is_compressed(name))
+ if (!compressions[comp].is_compressed(name))
return open(name, O_RDONLY);
fd = mkstemp(tmpbuf);
if (fd < 0) {
- dso->load_errno = errno;
+ *err = errno;
return -1;
}
- if (compressions[dso->comp].decompress(name, fd)) {
- dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
+ if (compressions[comp].decompress(name, fd)) {
+ *err = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
close(fd);
fd = -1;
}
@@ -328,6 +322,19 @@ static int decompress_kmodule(struct dso *dso, const char *name,
return fd;
}
+static int decompress_kmodule(struct dso *dso, const char *name,
+ char *pathname, size_t len)
+{
+ if (!dso__needs_decompress(dso))
+ return -1;
+
+ if (dso->comp == COMP_ID__NONE)
+ return -1;
+
+ return filename__decompress(name, pathname, len, dso->comp,
+ &dso->load_errno);
+}
+
int dso__decompress_kmodule_fd(struct dso *dso, const char *name)
{
return decompress_kmodule(dso, name, NULL, 0);
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index d8cb4f5680a4..cd2fe64a3c5d 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -274,6 +274,8 @@ bool dso__needs_decompress(struct dso *dso);
int dso__decompress_kmodule_fd(struct dso *dso, const char *name);
int dso__decompress_kmodule_path(struct dso *dso, const char *name,
char *pathname, size_t len);
+int filename__decompress(const char *name, char *pathname,
+ size_t len, int comp, int *err);
#define KMOD_DECOMP_NAME "/tmp/perf-kmod-XXXXXX"
#define KMOD_DECOMP_LEN sizeof(KMOD_DECOMP_NAME)
--
2.26.2
Adding support to decompress file before reading build id.
Adding filename__read_build_id and change its current
versions to read_build_id.
Shutting down stderr output of perf list in the shell test:
82: Check open filename arg using perf trace + vfs_getname : Ok
because with decompression code in the place we the
filename__read_build_id function is more verbose in case
of error and the test did not account for that.
Signed-off-by: Jiri Olsa <[email protected]>
---
.../tests/shell/trace+probe_vfs_getname.sh | 2 +-
tools/perf/util/symbol-elf.c | 37 ++++++++++++++++++-
2 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/tools/perf/tests/shell/trace+probe_vfs_getname.sh b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
index 11cc2af13f2b..3660fcc02fef 100755
--- a/tools/perf/tests/shell/trace+probe_vfs_getname.sh
+++ b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
@@ -20,7 +20,7 @@ skip_if_no_perf_trace || exit 2
file=$(mktemp /tmp/temporary_file.XXXXX)
trace_open_vfs_getname() {
- evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
+ evts=$(echo $(perf list syscalls:sys_enter_open* >&1 2>/dev/nul | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
perf trace -e $evts touch $file 2>&1 | \
egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
}
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 44dd86a4f25f..f3577f7d72fe 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -534,7 +534,7 @@ static int elf_read_build_id(Elf *elf, void *bf, size_t size)
#ifdef HAVE_LIBBFD_BUILDID_SUPPORT
-int filename__read_build_id(const char *filename, struct build_id *bid)
+static int read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
int err = -1;
@@ -563,7 +563,7 @@ int filename__read_build_id(const char *filename, struct build_id *bid)
#else // HAVE_LIBBFD_BUILDID_SUPPORT
-int filename__read_build_id(const char *filename, struct build_id *bid)
+static int read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
int fd, err = -1;
@@ -595,6 +595,39 @@ int filename__read_build_id(const char *filename, struct build_id *bid)
#endif // HAVE_LIBBFD_BUILDID_SUPPORT
+int filename__read_build_id(const char *filename, struct build_id *bid)
+{
+ struct kmod_path m = { .name = NULL, };
+ char path[PATH_MAX];
+ int err;
+
+ if (!filename)
+ return -EFAULT;
+
+ err = kmod_path__parse(&m, filename);
+ if (err)
+ return -1;
+
+ if (m.comp) {
+ int error = 0, fd;
+
+ fd = filename__decompress(filename, path, sizeof(path), m.comp, &error);
+ if (fd < 0) {
+ pr_debug("Failed to decompress (error %d) %s\n",
+ error, filename);
+ return -1;
+ }
+ close(fd);
+ filename = path;
+ }
+
+ err = read_build_id(filename, bid);
+
+ if (m.comp)
+ unlink(filename);
+ return err;
+}
+
int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
--
2.26.2
When adding new build id link we fail if the link is already
there. Adding check for existing link and output debug message
that the build id is already linked.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 7d9ecc37849c..ef9a31b54ba2 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -754,8 +754,21 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
tmp = dir_name + strlen(buildid_dir) - 5;
memcpy(tmp, "../..", 5);
- if (symlink(tmp, linkname) == 0)
+ if (symlink(tmp, linkname) == 0) {
err = 0;
+ } else if (errno == EEXIST) {
+ char path[PATH_MAX];
+
+ if (readlink(linkname, path, sizeof(path)) == -1) {
+ pr_err("Cant read link: %s\n", linkname);
+ goto out_free;
+ }
+ if (strcmp(tmp, path)) {
+ pr_debug("build <%s> already linked to %s\n",
+ sbuild_id, linkname);
+ }
+ err = 0;
+ }
/* Update SDT cache : error is just warned */
if (realname &&
--
2.26.2
Currently we don't check on kernel's vmlinux the same way as
we do for normal binaries, but we either look for kallsyms
file in build id database or check on known vmlinux locations
(plus some other optional paths).
This patch adds the check for standard build id binary location,
so we are ready once we start to store it there from debuginfod
in following changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 13 ++++++++++---
tools/perf/util/build-id.h | 2 ++
tools/perf/util/symbol.c | 16 ++++++++++++++++
3 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index ef9a31b54ba2..2755d7b37a44 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -260,10 +260,9 @@ static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
"debug" : "elf"));
}
-char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
- bool is_debug)
+char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
+ bool is_debug, bool is_kallsyms)
{
- bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
bool is_vdso = dso__is_vdso((struct dso *)dso);
char sbuild_id[SBUILD_ID_SIZE];
char *linkname;
@@ -292,6 +291,14 @@ char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
return bf;
}
+char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
+ bool is_debug)
+{
+ bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
+
+ return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms);
+}
+
#define dsos__for_each_with_build_id(pos, head) \
list_for_each_entry(pos, head, node) \
if (!pos->has_build_id) \
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index d53415feaf69..f1a2f67df6e4 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -29,6 +29,8 @@ char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
bool is_debug);
+char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
+ bool is_debug, bool is_kallsyms);
int build_id__mark_dso_hit(struct perf_tool *tool, union perf_event *event,
struct perf_sample *sample, struct evsel *evsel,
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 0d14abdf3d72..64a039cbba1b 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2189,6 +2189,8 @@ static int dso__load_kernel_sym(struct dso *dso, struct map *map)
int err;
const char *kallsyms_filename = NULL;
char *kallsyms_allocated_filename = NULL;
+ char *filename = NULL;
+
/*
* Step 1: if the user specified a kallsyms or vmlinux filename, use
* it and only it, reporting errors to the user if it cannot be used.
@@ -2213,6 +2215,20 @@ static int dso__load_kernel_sym(struct dso *dso, struct map *map)
return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
}
+ /*
+ * Before checking on common vmlinux locations, check if it's
+ * stored as standard build id binary (not kallsyms) under
+ * .debug cache.
+ */
+ if (!symbol_conf.ignore_vmlinux_buildid)
+ filename = __dso__build_id_filename(dso, NULL, 0, false, false);
+ if (filename != NULL) {
+ err = dso__load_vmlinux(dso, map, filename, true);
+ if (err > 0)
+ return err;
+ free(filename);
+ }
+
if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
err = dso__load_vmlinux_path(dso, map);
if (err > 0)
--
2.26.2
When processing mmap2 event, check on the build id
misc bit: PERF_RECORD_MISC_BUILD_ID and if it's set,
store the build id in mmap's dso object.
Also adding the build id data arts to struct
perf_record_mmap2 event definition.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/lib/perf/include/perf/event.h | 18 ++++++++++++++----
tools/perf/util/machine.c | 24 +++++++++++++++++++-----
tools/perf/util/map.c | 8 ++++++--
tools/perf/util/map.h | 3 ++-
4 files changed, 41 insertions(+), 12 deletions(-)
diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index 988c539bedb6..91984cfe8010 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -23,10 +23,20 @@ struct perf_record_mmap2 {
__u64 start;
__u64 len;
__u64 pgoff;
- __u32 maj;
- __u32 min;
- __u64 ino;
- __u64 ino_generation;
+ union {
+ struct {
+ __u32 maj;
+ __u32 min;
+ __u64 ino;
+ __u64 ino_generation;
+ };
+ struct {
+ __u8 build_id[20];
+ __u8 build_id_size;
+ __u8 __reserved_1;
+ __u16 __reserved_2;
+ };
+ };
__u32 prot;
__u32 flags;
char filename[PATH_MAX];
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 1ae32a81639c..1a2d01cc24ec 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1599,7 +1599,8 @@ static int machine__process_extra_kernel_map(struct machine *machine,
}
static int machine__process_kernel_mmap_event(struct machine *machine,
- struct extra_kernel_map *xm)
+ struct extra_kernel_map *xm,
+ struct build_id *bid)
{
struct map *map;
enum dso_space_type dso_space;
@@ -1624,6 +1625,10 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
goto out_problem;
map->end = map->start + xm->end - xm->start;
+
+ if (build_id__is_defined(bid))
+ dso__set_build_id(map->dso, bid);
+
} else if (is_kernel_mmap) {
const char *symbol_name = (xm->name + strlen(machine->mmap_name));
/*
@@ -1681,6 +1686,9 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
machine__update_kernel_mmap(machine, xm->start, xm->end);
+ if (build_id__is_defined(bid))
+ dso__set_build_id(kernel, bid);
+
/*
* Avoid using a zero address (kptr_restrict) for the ref reloc
* symbol. Effectively having zero here means that at record
@@ -1718,11 +1726,17 @@ int machine__process_mmap2_event(struct machine *machine,
.ino = event->mmap2.ino,
.ino_generation = event->mmap2.ino_generation,
};
+ struct build_id __bid, *bid = NULL;
int ret = 0;
if (dump_trace)
perf_event__fprintf_mmap2(event, stdout);
+ if (event->header.misc & PERF_RECORD_MISC_BUILD_ID) {
+ bid = &__bid;
+ build_id__init(bid, event->mmap2.build_id, event->mmap2.build_id_size);
+ }
+
if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
sample->cpumode == PERF_RECORD_MISC_KERNEL) {
struct extra_kernel_map xm = {
@@ -1732,7 +1746,7 @@ int machine__process_mmap2_event(struct machine *machine,
};
strlcpy(xm.name, event->mmap2.filename, KMAP_NAME_LEN);
- ret = machine__process_kernel_mmap_event(machine, &xm);
+ ret = machine__process_kernel_mmap_event(machine, &xm, bid);
if (ret < 0)
goto out_problem;
return 0;
@@ -1746,7 +1760,7 @@ int machine__process_mmap2_event(struct machine *machine,
map = map__new(machine, event->mmap2.start,
event->mmap2.len, event->mmap2.pgoff,
&dso_id, event->mmap2.prot,
- event->mmap2.flags,
+ event->mmap2.flags, bid,
event->mmap2.filename, thread);
if (map == NULL)
@@ -1789,7 +1803,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
};
strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
- ret = machine__process_kernel_mmap_event(machine, &xm);
+ ret = machine__process_kernel_mmap_event(machine, &xm, NULL);
if (ret < 0)
goto out_problem;
return 0;
@@ -1805,7 +1819,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
map = map__new(machine, event->mmap.start,
event->mmap.len, event->mmap.pgoff,
- NULL, prot, 0, event->mmap.filename, thread);
+ NULL, prot, 0, NULL, event->mmap.filename, thread);
if (map == NULL)
goto out_problem_map;
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index f44ede437dc7..692e56dc832e 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -130,8 +130,8 @@ void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
struct map *map__new(struct machine *machine, u64 start, u64 len,
u64 pgoff, struct dso_id *id,
- u32 prot, u32 flags, char *filename,
- struct thread *thread)
+ u32 prot, u32 flags, struct build_id *bid,
+ char *filename, struct thread *thread)
{
struct map *map = malloc(sizeof(*map));
struct nsinfo *nsi = NULL;
@@ -194,6 +194,10 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
dso__set_loaded(dso);
}
dso->nsinfo = nsi;
+
+ if (build_id__is_defined(bid))
+ dso__set_build_id(dso, bid);
+
dso__put(dso);
}
return map;
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index b1c0686db1b7..9f32825c98d8 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -104,10 +104,11 @@ void map__init(struct map *map,
u64 start, u64 end, u64 pgoff, struct dso *dso);
struct dso_id;
+struct build_id;
struct map *map__new(struct machine *machine, u64 start, u64 len,
u64 pgoff, struct dso_id *id, u32 prot, u32 flags,
- char *filename, struct thread *thread);
+ struct build_id *bid, char *filename, struct thread *thread);
struct map *map__new2(u64 start, struct dso *dso);
void map__delete(struct map *map);
struct map *map__clone(struct map *map);
--
2.26.2
Adding support to display build id in mmap2 events:
$ perf script --show-mmap-events | head -4
swapper ... @ 0xffffffff81000000 <ff1969b3ba5e43911208bb46fa7d5b1eb809e422>]: ---p [kernel.kallsyms]_text
swapper ... @ 0 <5f62adb730272c9417883ae8b8a8ec224df8cddd>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/drivers/firmware/qemu_fw_cfg.ko
swapper ... @ 0 <c9ac6e1dafc1ebdadb048f967854e810706c8bab>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/drivers/char/virtio_console.ko
swapper ... @ 0 <86441a4c5b2c2ff5b440682f4c612bd4b426eb5c>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/lib/libcrc32c.ko
$ perf report -D | grep MMAP2 | head -4
0 0 ... @ 0xffffffff81000000 <ff1969b3ba5e43911208bb46fa7d5b1eb809e422>]: ---p [kernel.kallsyms]_text
0 0 ... @ 0 <5f62adb730272c9417883ae8b8a8ec224df8cddd>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/drivers/firmware/qemu_fw_cfg.ko
0 0 ... @ 0 <c9ac6e1dafc1ebdadb048f967854e810706c8bab>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/drivers/char/virtio_console.ko
0 0 ... @ 0 <86441a4c5b2c2ff5b440682f4c612bd4b426eb5c>]: ---p /lib/modules/5.9.0-rc5buildid+/kernel/lib/libcrc32c.ko
Adding build id data into <> brackets.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/event.c | 41 ++++++++++++++++++++++++++++++-----------
1 file changed, 30 insertions(+), 11 deletions(-)
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 05616d4138a9..7f17970293da 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -288,17 +288,36 @@ size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
{
- return fprintf(fp, " %d/%d: [%#" PRI_lx64 "(%#" PRI_lx64 ") @ %#" PRI_lx64
- " %02x:%02x %"PRI_lu64" %"PRI_lu64"]: %c%c%c%c %s\n",
- event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
- event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
- event->mmap2.min, event->mmap2.ino,
- event->mmap2.ino_generation,
- (event->mmap2.prot & PROT_READ) ? 'r' : '-',
- (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
- (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
- (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
- event->mmap2.filename);
+ if (event->header.misc & PERF_RECORD_MISC_BUILD_ID) {
+ char sbuild_id[SBUILD_ID_SIZE];
+ struct build_id bid;
+
+ build_id__init(&bid, event->mmap2.build_id,
+ event->mmap2.build_id_size);
+ build_id__sprintf(&bid, sbuild_id);
+
+ return fprintf(fp, " %d/%d: [%#" PRI_lx64 "(%#" PRI_lx64 ") @ %#" PRI_lx64
+ " <%s>]: %c%c%c%c %s\n",
+ event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
+ event->mmap2.len, event->mmap2.pgoff, sbuild_id,
+ (event->mmap2.prot & PROT_READ) ? 'r' : '-',
+ (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
+ (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
+ (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
+ event->mmap2.filename);
+ } else {
+ return fprintf(fp, " %d/%d: [%#" PRI_lx64 "(%#" PRI_lx64 ") @ %#" PRI_lx64
+ " %02x:%02x %"PRI_lu64" %"PRI_lu64"]: %c%c%c%c %s\n",
+ event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
+ event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
+ event->mmap2.min, event->mmap2.ino,
+ event->mmap2.ino_generation,
+ (event->mmap2.prot & PROT_READ) ? 'r' : '-',
+ (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
+ (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
+ (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
+ event->mmap2.filename);
+ }
}
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
--
2.26.2
Using machine__for_each_dso in perf_session__cache_build_ids,
so we can reuse perf_session__cache_build_ids with different
callback in following changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 41 +++++++++++++++-----------------------
1 file changed, 16 insertions(+), 25 deletions(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 2755d7b37a44..9f14d5851bb5 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -854,12 +854,16 @@ int build_id_cache__remove_s(const char *sbuild_id)
return err;
}
-static int dso__cache_build_id(struct dso *dso, struct machine *machine)
+static int dso__cache_build_id(struct dso *dso, struct machine *machine,
+ void *priv __maybe_unused)
{
bool is_kallsyms = dso__is_kallsyms(dso);
bool is_vdso = dso__is_vdso(dso);
const char *name = dso->long_name;
+ if (!dso->has_build_id)
+ return 0;
+
if (dso__is_kcore(dso)) {
is_kallsyms = true;
name = machine->mmap_name;
@@ -868,43 +872,30 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine)
is_kallsyms, is_vdso);
}
-static int __dsos__cache_build_ids(struct list_head *head,
- struct machine *machine)
+static int
+machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)
{
- struct dso *pos;
- int err = 0;
-
- dsos__for_each_with_build_id(pos, head)
- if (dso__cache_build_id(pos, machine))
- err = -1;
+ int ret = machine__for_each_dso(&machines->host, fn, priv);
+ struct rb_node *nd;
- return err;
-}
+ for (nd = rb_first_cached(&machines->guests); nd;
+ nd = rb_next(nd)) {
+ struct machine *pos = rb_entry(nd, struct machine, rb_node);
-static int machine__cache_build_ids(struct machine *machine)
-{
- return __dsos__cache_build_ids(&machine->dsos.head, machine);
+ ret |= machine__for_each_dso(pos, fn, priv);
+ }
+ return ret ? -1 : 0;
}
int perf_session__cache_build_ids(struct perf_session *session)
{
- struct rb_node *nd;
- int ret;
-
if (no_buildid_cache)
return 0;
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
return -1;
- ret = machine__cache_build_ids(&session->machines.host);
-
- for (nd = rb_first_cached(&session->machines.guests); nd;
- nd = rb_next(nd)) {
- struct machine *pos = rb_entry(nd, struct machine, rb_node);
- ret |= machine__cache_build_ids(pos);
- }
- return ret ? -1 : 0;
+ return machines__for_each_dso(&session->machines, dso__cache_build_id, NULL) ? -1 : 0;
}
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
--
2.26.2
Adding is_perf_data function that returns true if
the given path is perf data file. It will be used
in following patches.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/data.c | 19 +++++++++++++++++++
tools/perf/util/data.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index c47aa34fdc0a..be049e812f5a 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -457,3 +457,22 @@ char *perf_data__kallsyms_name(struct perf_data *data)
return kallsyms_name;
}
+
+bool is_perf_data(const char *path)
+{
+ bool ret = false;
+ FILE *file;
+ u64 magic;
+
+ file = fopen(path, "r");
+ if (!file)
+ return false;
+
+ if (fread(&magic, 1, 8, file) < 8)
+ goto out;
+
+ ret = is_perf_magic(magic);
+out:
+ fclose(file);
+ return ret;
+}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 75947ef6bc17..0ebb1568ca86 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -89,4 +89,5 @@ int perf_data__update_dir(struct perf_data *data);
unsigned long perf_data__size(struct perf_data *data);
int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz);
char *perf_data__kallsyms_name(struct perf_data *data);
+bool is_perf_data(const char *path);
#endif /* __PERF_DATA_H */
--
2.26.2
Adding support to specify perf data file as -a option file
argument,
If the file is detected to be perf data file, it is processed
and all dso objects with sample hit are stored to the build
id cache.
$ DEBUGINFOD_URLS=http://192.168.122.174:8002 perf buildid-cache -a perf.data
OK 5dcec522abf136fcfd3128f47e131f2365834dd7 /home/jolsa/.debug/.build-id/5d/cec522abf136fcfd3128f47e131f2365834dd7/elf
OK 5784f813b727a50cfd3363234aef9fcbab685cc4 /lib/modules/5.10.0-rc2speed+/kernel/fs/xfs/xfs.ko
By default we store only dso with hits, but it's possible to
specify 'all' to store all dso objects, like:
-a perf.data,all
$ DEBUGINFOD_URLS=http://192.168.122.174:8002 perf buildid-cache -a perf.data,all
OK 5dcec522abf136fcfd3128f47e131f2365834dd7 /home/jolsa/.debug/.build-id/5d/cec522abf136fcfd3128f47e131f2365834dd7/elf
OK 6ce92dc7c31f12fe5b7775a2bb8b14a3546ce2cd /lib/modules/5.10.0-rc2speed+/kernel/drivers/firmware/qemu_fw_cfg.ko
OK bf3f6d32dccc159f841fc3658c241d0e74c61fbb /lib/modules/5.10.0-rc2speed+/kernel/drivers/block/virtio_blk.ko
OK e896b4329cf9f190f1a0fae933f425ff8f71b052 /lib/modules/5.10.0-rc2speed+/kernel/drivers/char/virtio_console.ko
OK 5bedc933cb59e053ecb472f327bd73c548364479 /lib/modules/5.10.0-rc2speed+/kernel/drivers/input/serio/serio_raw.ko
OK cecc506368a8b7a473a5f900d26f0d3d914a9c23 /lib/modules/5.10.0-rc2speed+/kernel/arch/x86/crypto/crc32c-intel.ko
OK 91076fb3646d061a0a42cf7bddb339a665ee4f80 /lib/modules/5.10.0-rc2speed+/kernel/arch/x86/crypto/ghash-clmulni-intel.ko
OK 4e2a304d788bb8e2e950bc82a5944e042afa0bf2 /lib/modules/5.10.0-rc2speed+/kernel/drivers/media/cec/core/cec.ko
OK 31ab0da5ad81e6803280177f507a95f3053d585e /lib/modules/5.10.0-rc2speed+/kernel/lib/libcrc32c.ko
OK f6154bca47c149f48c942fcc3d653041dd285c65 /lib/modules/5.10.0-rc2speed+/kernel/drivers/gpu/drm/ttm/ttm.ko
OK 723f5852de81590d54b23b38c160d3618b41951b /lib/modules/5.10.0-rc2speed+/kernel/arch/x86/crypto/crct10dif-pclmul.ko
OK 06b1eab7f141cbc3e5a5db47909c8ab5cb242e40 /lib/modules/5.10.0-rc2speed+/kernel/drivers/gpu/drm/drm_ttm_helper.ko
OK 38292b862cf3ff87489508fdb4895efa45780813 /lib/modules/5.10.0-rc2speed+/kernel/drivers/gpu/drm/qxl/qxl.ko
OK cdf51e58609bf2ce4837a7b195e0ccae0a930907 /lib/modules/5.10.0-rc2speed+/kernel/arch/x86/crypto/crc32-pclmul.ko
OK 5ca8958388f6688452ecc2cb83d6031394c659ad /lib/modules/5.10.0-rc2speed+/kernel/drivers/gpu/drm/drm.ko
OK 236bc4e4f38bf3559007566cb32b3dcc1bc28d2d /lib/modules/5.10.0-rc2speed+/kernel/drivers/gpu/drm/drm_kms_helper.ko
OK 5784f813b727a50cfd3363234aef9fcbab685cc4 /lib/modules/5.10.0-rc2speed+/kernel/fs/xfs/xfs.ko
OK 66db2be3efaa43bb5a5c481986e9554e1885cc69 /usr/lib/systemd/systemd
OK 7db607d9f2de89860d9639712da64c8bacd31e4b /usr/lib64/libm-2.30.so
OK 55b5f9652e1d17c1dd58f62628d5063428e5db91 /usr/lib64/libudev.so.1.6.15
OK 63b97070bf097130713bb6c89cf7100b5f3c9b17 /usr/lib64/libunistring.so.2.1.0
...
Once perf data is specified, no other file can be specified in
the option, otherwise it causes syntax error.
Signed-off-by: Jiri Olsa <[email protected]>
---
.../perf/Documentation/perf-buildid-cache.txt | 12 +-
tools/perf/builtin-buildid-cache.c | 208 +++++++++++++++++-
tools/perf/util/probe-event.c | 6 +-
3 files changed, 220 insertions(+), 6 deletions(-)
diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
index f6de0952ff3c..b77da5138bca 100644
--- a/tools/perf/Documentation/perf-buildid-cache.txt
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -23,7 +23,17 @@ OPTIONS
-------
-a::
--add=::
- Add specified file to the cache.
+ Add specified file or perf.data binaries to the cache.
+
+ If the file is detected to be perf data file, it is processed
+ and all dso objects with sample hit are stored to the cache.
+
+ It's possible to specify 'all' to store all dso objects, like:
+ -a perf.data,all
+
+ Once perf data is specified, no other file can be specified in
+ the option, otherwise it causes syntax error.
+
-f::
--force::
Don't complain, do it.
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index a25411926e48..e4a42aa2b497 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -29,6 +29,11 @@
#include "util/probe-file.h"
#include <linux/string.h>
#include <linux/err.h>
+#include <linux/zalloc.h>
+#include <sys/stat.h>
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+#include <elfutils/debuginfod.h>
+#endif
static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
{
@@ -348,6 +353,198 @@ static int build_id_cache__show_all(void)
return 0;
}
+#ifdef HAVE_DEBUGINFOD_SUPPORT
+static int call_debuginfod(const char *sbuild_id, char **path, bool debuginfo)
+{
+ debuginfod_client *c;
+ int fd;
+
+ c = debuginfod_begin();
+ if (c == NULL)
+ return -1;
+
+ pr_debug("trying debuginfod for executable <%s> ... ", sbuild_id);
+
+ if (debuginfo) {
+ fd = debuginfod_find_debuginfo(c, (const unsigned char *) sbuild_id,
+ 0, path);
+ } else {
+ fd = debuginfod_find_executable(c, (const unsigned char *) sbuild_id,
+ 0, path);
+ }
+ if (fd >= 0)
+ close(fd); /* retaining reference by realname */
+
+ debuginfod_end(c);
+ pr_debug("%s%s\n", *path ? "OK " : "FAILED", *path ? *path : "");
+ return *path ? 0 : -1;
+}
+#else
+static int call_debuginfod(const char *sbuild_id __maybe_unused,
+ char **path __maybe_unused,
+ bool debuginfo __maybe_unused)
+{
+ return -1;
+}
+#endif
+
+struct dso_store_data {
+ bool hits;
+ bool force_download;
+};
+
+static int dso_store(struct dso *dso, struct machine *machine, void *priv)
+{
+ struct dso_store_data *data = priv;
+ char sbuild_id[SBUILD_ID_SIZE];
+ struct build_id bid;
+ char *path = NULL, *link = NULL;
+ bool is_kallsyms;
+ int err = -1;
+
+ /*
+ * There's no build id in dso, nothing to do..
+ */
+ if (!dso->has_build_id || !build_id__is_defined(&dso->bid))
+ return 0;
+
+ if (data->hits && !dso->hit)
+ return 0;
+
+ /*
+ * The storing process is:
+ * - get build id of the dso
+ * - check if it is already in cache
+ * - check if it matches provided build id from mmap2 event
+ * - if not, try debuginfod to download the binary
+ * - store binary to build id database
+ */
+ is_kallsyms = !strcmp(machine->mmap_name, dso->short_name);
+ build_id__sprintf(&dso->bid, sbuild_id);
+
+ link = build_id_cache__linkname(sbuild_id, NULL, 0);
+ if (!link)
+ return -ENOMEM;
+
+ if (!data->force_download && !access(link, X_OK)) {
+ pr_debug("already in cache - %s <%s>\n", dso->long_name, sbuild_id);
+ err = 0;
+ goto out;
+ }
+
+ path = strdup(dso->long_name);
+ if (!path)
+ goto out;
+
+ if (is_kallsyms) {
+ /*
+ * Find out if we are on the same kernel as perf.data
+ * and store kallsyms in that case.
+ */
+ err = sysfs__read_build_id("/sys/kernel/notes", &bid);
+ if (err < 0)
+ goto out;
+ } else {
+ struct nscookie nsc;
+ struct stat st;
+
+ nsinfo__mountns_enter(dso->nsinfo, &nsc);
+
+ /*
+ * Does the file exists in the first place, if it does,
+ * resolve path and read the build id.
+ */
+ if (stat(dso->long_name, &st)) {
+ nsinfo__mountns_exit(&nsc);
+ zfree(&path);
+ goto try_download;
+ }
+
+ err = filename__read_build_id(dso->long_name, &bid);
+ nsinfo__mountns_exit(&nsc);
+
+ if (err <= 0)
+ goto out;
+ }
+
+ /*
+ * If we match, then what we want in mmap2 event
+ * is what we got in the binary,
+ */
+ if (bid.size != dso->bid.size || memcmp(&bid, &dso->bid, bid.size)) {
+ char sbid[SBUILD_ID_SIZE];
+
+ build_id__sprintf(&bid, sbid);
+ pr_debug("mmap build id <%s> does not match for %s <%s>\n",
+ sbuild_id, path, sbid);
+ zfree(&path);
+ }
+
+try_download:
+ /*
+ * We did not match build id or did not find the
+ * binary - try debuginfod as last resort.
+ */
+ if (!path) {
+ char *tmp = NULL;
+
+ /*
+ * The debuginfo retrieval is handled within
+ * build_id_cache__add function.
+ */
+ if (call_debuginfod(sbuild_id, &tmp, false) &&
+ call_debuginfod(sbuild_id, &tmp, true)) {
+ err = -1;
+ goto out;
+ }
+
+ path = tmp;
+
+ /*
+ * The kernel dso is now elf binary, so disable is_kallsyms
+ * so build_id_cache__add can prepare proper file names.
+ */
+ is_kallsyms = false;
+ }
+
+ pr_debug("linking %s %s <%s>\n", dso->short_name, path, sbuild_id);
+
+ err = build_id_cache__add(sbuild_id, path, path,
+ dso->nsinfo, is_kallsyms, false);
+out:
+ free(path);
+ fprintf(stderr, "%s %s %s\n", err ? "FAIL" : "OK ", sbuild_id, dso->long_name);
+ return 0;
+}
+
+static int
+build_id_cache__add_perf_data(const char *path, bool all)
+{
+ struct perf_session *session;
+ struct dso_store_data priv = {
+ .hits = !all,
+ .force_download = false,
+ };
+ struct perf_data data = {
+ .path = path,
+ .mode = PERF_DATA_MODE_READ,
+ };
+ int err;
+
+ session = perf_session__new(&data, false, &build_id__mark_dso_hit_ops);
+ if (IS_ERR(session))
+ return PTR_ERR(session);
+
+ err = perf_session__process_events(session);
+ if (err)
+ goto out;
+
+ err = __perf_session__cache_build_ids(session, dso_store, &priv);
+out:
+ perf_session__delete(session);
+ return err;
+}
+
int cmd_buildid_cache(int argc, const char **argv)
{
struct strlist *list;
@@ -440,7 +637,15 @@ int cmd_buildid_cache(int argc, const char **argv)
list = strlist__new(add_name_list_str, NULL);
if (list) {
strlist__for_each_entry(pos, list)
- if (build_id_cache__add_file(pos->s, nsi)) {
+ if (is_perf_data(pos->s)) {
+ struct str_node *all_pos = strlist__next(pos);
+ bool all = !strcmp("all", all_pos ? all_pos->s : "");
+
+ if (build_id_cache__add_perf_data(pos->s, all))
+ pr_warning("Couldn't add build ids from %s\n", pos->s);
+ if (all)
+ pos = all_pos;
+ } else if (build_id_cache__add_file(pos->s, nsi)) {
if (errno == EEXIST) {
pr_debug("%s already in the cache\n",
pos->s);
@@ -449,7 +654,6 @@ int cmd_buildid_cache(int argc, const char **argv)
pr_warning("Couldn't add %s: %s\n",
pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
}
-
strlist__delete(list);
}
}
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 8eae2afff71a..e821bb977c9b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1616,9 +1616,9 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
return -EINVAL;
}
- pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
- pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
- pp->lazy_line);
+ pr_debug2("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
+ pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
+ pp->lazy_line);
return 0;
}
--
2.26.2
Add buildid-list support for mmap2's build id data, so we can
display build ids for dso objects for data without the build
id cache update.
$ perf buildid-list
1805c738c8f3ec0f47b7ea09080c28f34d18a82b /usr/lib64/ld-2.31.so
d278249792061c6b74d1693ca59513be1def13f2 /usr/lib64/libc-2.31.so
By default only dso objects with hits are shown.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/builtin-buildid-list.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index e3ef75583514..87f5b1a4a7fa 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -77,6 +77,9 @@ static int perf_session__list_build_ids(bool force, bool with_hits)
perf_header__has_feat(&session->header, HEADER_AUXTRACE))
with_hits = false;
+ if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID))
+ with_hits = true;
+
/*
* in pipe-mode, the only way to get the buildids is to parse
* the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
--
2.26.2
Adding --buildid-mmap option to enable build id in mmap2 events.
It will only work if there's kernel support for that and it disables
build id cache (implies --no-buildid).
It's also possible to enable it permanently via config option
in ~.perfconfig file:
[record]
build-id=mmap
Also added build_id bit in the verbose output for perf_event_attr:
# perf record --buildid-mmap -vv
...
perf_event_attr:
type 1
size 120
...
build_id 1
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/Documentation/perf-record.txt | 3 +++
tools/perf/builtin-record.c | 20 ++++++++++++++++++++
tools/perf/util/evsel.c | 10 ++++++----
tools/perf/util/perf_api_probe.c | 10 ++++++++++
tools/perf/util/perf_api_probe.h | 1 +
tools/perf/util/perf_event_attr_fprintf.c | 1 +
tools/perf/util/record.h | 1 +
7 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 768888b9326a..1bcf51e24979 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -482,6 +482,9 @@ Specify vmlinux path which has debuginfo.
--buildid-all::
Record build-id of all DSOs regardless whether it's actually hit or not.
+--buildid-mmap::
+Record build ids in mmap2 events, disables build id cache (implies --no-buildid).
+
--aio[=n]::
Use <n> control blocks in asynchronous (Posix AIO) trace writing mode (default: 1, max: 4).
Asynchronous mode is supported only when linking Perf tool with libc library
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index adf311d15d3d..47bae9d82d43 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -102,6 +102,7 @@ struct record {
bool no_buildid_cache;
bool no_buildid_cache_set;
bool buildid_all;
+ bool buildid_mmap;
bool timestamp_filename;
bool timestamp_boundary;
struct switch_output switch_output;
@@ -2139,6 +2140,8 @@ static int perf_record_config(const char *var, const char *value, void *cb)
rec->no_buildid_cache = true;
else if (!strcmp(value, "skip"))
rec->no_buildid = true;
+ else if (!strcmp(value, "mmap"))
+ rec->buildid_mmap = true;
else
return -1;
return 0;
@@ -2554,6 +2557,8 @@ static struct option __record_options[] = {
"file", "vmlinux pathname"),
OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
"Record build-id of all DSOs regardless of hits"),
+ OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
+ "Record build-id in map events"),
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
"append timestamp to output filename"),
OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
@@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
}
+ if (rec->buildid_mmap) {
+ if (!perf_can_record_build_id()) {
+ pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
+ err = -EINVAL;
+ goto out_opts;
+ }
+ pr_debug("Enabling build id in mmap2 events.\n");
+ /* Enable mmap build id synthesizing. */
+ symbol_conf.buildid_mmap2 = true;
+ /* Enable perf_event_attr::build_id bit. */
+ rec->opts.build_id = true;
+ /* Disable build id cache. */
+ rec->no_buildid = true;
+ }
+
if (rec->opts.kcore)
rec->data.is_dir = true;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1cad6051d8b0..749d806ee1d1 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1170,10 +1170,12 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
if (opts->sample_weight)
evsel__set_sample_bit(evsel, WEIGHT);
- attr->task = track;
- attr->mmap = track;
- attr->mmap2 = track && !perf_missing_features.mmap2;
- attr->comm = track;
+ attr->task = track;
+ attr->mmap = track;
+ attr->mmap2 = track && !perf_missing_features.mmap2;
+ attr->comm = track;
+ attr->build_id = track && opts->build_id;
+
/*
* ksymbol is tracked separately with text poke because it needs to be
* system wide and enabled immediately.
diff --git a/tools/perf/util/perf_api_probe.c b/tools/perf/util/perf_api_probe.c
index 3840d02f0f7b..829af17a0867 100644
--- a/tools/perf/util/perf_api_probe.c
+++ b/tools/perf/util/perf_api_probe.c
@@ -98,6 +98,11 @@ static void perf_probe_text_poke(struct evsel *evsel)
evsel->core.attr.text_poke = 1;
}
+static void perf_probe_build_id(struct evsel *evsel)
+{
+ evsel->core.attr.build_id = 1;
+}
+
bool perf_can_sample_identifier(void)
{
return perf_probe_api(perf_probe_sample_identifier);
@@ -172,3 +177,8 @@ bool perf_can_aux_sample(void)
return true;
}
+
+bool perf_can_record_build_id(void)
+{
+ return perf_probe_api(perf_probe_build_id);
+}
diff --git a/tools/perf/util/perf_api_probe.h b/tools/perf/util/perf_api_probe.h
index d5506a983a94..f12ca55f509a 100644
--- a/tools/perf/util/perf_api_probe.h
+++ b/tools/perf/util/perf_api_probe.h
@@ -11,5 +11,6 @@ bool perf_can_record_cpu_wide(void);
bool perf_can_record_switch_events(void);
bool perf_can_record_text_poke_events(void);
bool perf_can_sample_identifier(void);
+bool perf_can_record_build_id(void);
#endif // __PERF_API_PROBE_H
diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index e67a227c0ce7..0f1c62d40a89 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -134,6 +134,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(bpf_event, p_unsigned);
PRINT_ATTRf(aux_output, p_unsigned);
PRINT_ATTRf(cgroup, p_unsigned);
+ PRINT_ATTRf(build_id, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 266760ac9143..609e706f4282 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -49,6 +49,7 @@ struct record_opts {
bool no_bpf_event;
bool kcore;
bool text_poke;
+ bool build_id;
unsigned int freq;
unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages;
--
2.26.2
Adding __perf_session__cache_build_ids function as an
interface for caching sessions build ids with callback
function and its data pointer.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 10 ++++++++--
tools/perf/util/build-id.h | 3 +++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 9f14d5851bb5..dc8f864fe15a 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -887,7 +887,8 @@ machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)
return ret ? -1 : 0;
}
-int perf_session__cache_build_ids(struct perf_session *session)
+int __perf_session__cache_build_ids(struct perf_session *session,
+ machine__dso_t fn, void *priv)
{
if (no_buildid_cache)
return 0;
@@ -895,7 +896,12 @@ int perf_session__cache_build_ids(struct perf_session *session)
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
return -1;
- return machines__for_each_dso(&session->machines, dso__cache_build_id, NULL) ? -1 : 0;
+ return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0;
+}
+
+int perf_session__cache_build_ids(struct perf_session *session)
+{
+ return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL);
}
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index f1a2f67df6e4..c6f10e3d2152 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -5,6 +5,7 @@
#define BUILD_ID_SIZE 20
#define SBUILD_ID_SIZE (BUILD_ID_SIZE * 2 + 1)
+#include "machine.h"
#include "tool.h"
#include <linux/types.h>
@@ -46,6 +47,8 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
int perf_session__write_buildid_table(struct perf_session *session,
struct feat_fd *fd);
int perf_session__cache_build_ids(struct perf_session *session);
+int __perf_session__cache_build_ids(struct perf_session *session,
+ machine__dso_t fn, void *priv);
char *build_id_cache__origname(const char *sbuild_id);
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size);
--
2.26.2
Using struct extra_kernel_map in machine__process_kernel_mmap_event,
to pass mmap details. This way we can used single function for all 3
mmap versions.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/machine.c | 62 +++++++++++++++++++++------------------
1 file changed, 33 insertions(+), 29 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 15385ea00190..1ae32a81639c 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1581,32 +1581,25 @@ static bool machine__uses_kcore(struct machine *machine)
}
static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
- union perf_event *event)
+ struct extra_kernel_map *xm)
{
return machine__is(machine, "x86_64") &&
- is_entry_trampoline(event->mmap.filename);
+ is_entry_trampoline(xm->name);
}
static int machine__process_extra_kernel_map(struct machine *machine,
- union perf_event *event)
+ struct extra_kernel_map *xm)
{
struct dso *kernel = machine__kernel_dso(machine);
- struct extra_kernel_map xm = {
- .start = event->mmap.start,
- .end = event->mmap.start + event->mmap.len,
- .pgoff = event->mmap.pgoff,
- };
if (kernel == NULL)
return -1;
- strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
-
- return machine__create_extra_kernel_map(machine, kernel, &xm);
+ return machine__create_extra_kernel_map(machine, kernel, xm);
}
static int machine__process_kernel_mmap_event(struct machine *machine,
- union perf_event *event)
+ struct extra_kernel_map *xm)
{
struct map *map;
enum dso_space_type dso_space;
@@ -1621,20 +1614,18 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
else
dso_space = DSO_SPACE__KERNEL_GUEST;
- is_kernel_mmap = memcmp(event->mmap.filename,
- machine->mmap_name,
+ is_kernel_mmap = memcmp(xm->name, machine->mmap_name,
strlen(machine->mmap_name) - 1) == 0;
- if (event->mmap.filename[0] == '/' ||
- (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
- map = machine__addnew_module_map(machine, event->mmap.start,
- event->mmap.filename);
+ if (xm->name[0] == '/' ||
+ (!is_kernel_mmap && xm->name[0] == '[')) {
+ map = machine__addnew_module_map(machine, xm->start,
+ xm->name);
if (map == NULL)
goto out_problem;
- map->end = map->start + event->mmap.len;
+ map->end = map->start + xm->end - xm->start;
} else if (is_kernel_mmap) {
- const char *symbol_name = (event->mmap.filename +
- strlen(machine->mmap_name));
+ const char *symbol_name = (xm->name + strlen(machine->mmap_name));
/*
* Should be there already, from the build-id table in
* the header.
@@ -1688,18 +1679,17 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
if (strstr(kernel->long_name, "vmlinux"))
dso__set_short_name(kernel, "[kernel.vmlinux]", false);
- machine__update_kernel_mmap(machine, event->mmap.start,
- event->mmap.start + event->mmap.len);
+ machine__update_kernel_mmap(machine, xm->start, xm->end);
/*
* Avoid using a zero address (kptr_restrict) for the ref reloc
* symbol. Effectively having zero here means that at record
* time /proc/sys/kernel/kptr_restrict was non zero.
*/
- if (event->mmap.pgoff != 0) {
+ if (xm->pgoff != 0) {
map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map,
symbol_name,
- event->mmap.pgoff);
+ xm->pgoff);
}
if (machine__is_default_guest(machine)) {
@@ -1708,8 +1698,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
*/
dso__load(kernel, machine__kernel_map(machine));
}
- } else if (perf_event__is_extra_kernel_mmap(machine, event)) {
- return machine__process_extra_kernel_map(machine, event);
+ } else if (perf_event__is_extra_kernel_mmap(machine, xm)) {
+ return machine__process_extra_kernel_map(machine, xm);
}
return 0;
out_problem:
@@ -1735,7 +1725,14 @@ int machine__process_mmap2_event(struct machine *machine,
if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
sample->cpumode == PERF_RECORD_MISC_KERNEL) {
- ret = machine__process_kernel_mmap_event(machine, event);
+ struct extra_kernel_map xm = {
+ .start = event->mmap2.start,
+ .end = event->mmap2.start + event->mmap2.len,
+ .pgoff = event->mmap2.pgoff,
+ };
+
+ strlcpy(xm.name, event->mmap2.filename, KMAP_NAME_LEN);
+ ret = machine__process_kernel_mmap_event(machine, &xm);
if (ret < 0)
goto out_problem;
return 0;
@@ -1785,7 +1782,14 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
sample->cpumode == PERF_RECORD_MISC_KERNEL) {
- ret = machine__process_kernel_mmap_event(machine, event);
+ struct extra_kernel_map xm = {
+ .start = event->mmap.start,
+ .end = event->mmap.start + event->mmap.len,
+ .pgoff = event->mmap.pgoff,
+ };
+
+ strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
+ ret = machine__process_kernel_mmap_event(machine, &xm);
if (ret < 0)
goto out_problem;
return 0;
--
2.26.2
Allow mmap2 event to synthesize kernel image,
so we can synthesize kernel build id data in
following changes.
It's enabled by new symbol_conf.buildid_mmap2
bool, which will be switched in following
changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/symbol_conf.h | 3 ++-
tools/perf/util/synthetic-events.c | 40 ++++++++++++++++++++----------
2 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/tools/perf/util/symbol_conf.h b/tools/perf/util/symbol_conf.h
index b916afb95ec5..b18f9c8dbb75 100644
--- a/tools/perf/util/symbol_conf.h
+++ b/tools/perf/util/symbol_conf.h
@@ -42,7 +42,8 @@ struct symbol_conf {
report_block,
report_individual_block,
inline_name,
- disable_add2line_warn;
+ disable_add2line_warn,
+ buildid_mmap2;
const char *vmlinux_name,
*kallsyms_name,
*source_prefix,
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 8a23391558cf..872df6d6dbef 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -988,11 +988,12 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
- size_t size;
+ union perf_event *event;
+ size_t size = symbol_conf.buildid_mmap2 ?
+ sizeof(event->mmap2) : sizeof(event->mmap);
struct map *map = machine__kernel_map(machine);
struct kmap *kmap;
int err;
- union perf_event *event;
if (map == NULL)
return -1;
@@ -1006,7 +1007,7 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
* available use this, and after it is use this as a fallback for older
* kernels.
*/
- event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
+ event = zalloc(size + machine->id_hdr_size);
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
@@ -1023,16 +1024,29 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
}
- size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
- "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
- size = PERF_ALIGN(size, sizeof(u64));
- event->mmap.header.type = PERF_RECORD_MMAP;
- event->mmap.header.size = (sizeof(event->mmap) -
- (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
- event->mmap.pgoff = kmap->ref_reloc_sym->addr;
- event->mmap.start = map->start;
- event->mmap.len = map->end - event->mmap.start;
- event->mmap.pid = machine->pid;
+ if (symbol_conf.buildid_mmap2) {
+ size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
+ "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
+ size = PERF_ALIGN(size, sizeof(u64));
+ event->mmap2.header.type = PERF_RECORD_MMAP2;
+ event->mmap2.header.size = (sizeof(event->mmap2) -
+ (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
+ event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
+ event->mmap2.start = map->start;
+ event->mmap2.len = map->end - event->mmap.start;
+ event->mmap2.pid = machine->pid;
+ } else {
+ size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
+ "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
+ size = PERF_ALIGN(size, sizeof(u64));
+ event->mmap.header.type = PERF_RECORD_MMAP;
+ event->mmap.header.size = (sizeof(event->mmap) -
+ (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
+ event->mmap.pgoff = kmap->ref_reloc_sym->addr;
+ event->mmap.start = map->start;
+ event->mmap.len = map->end - event->mmap.start;
+ event->mmap.pid = machine->pid;
+ }
err = perf_tool__process_synth_event(tool, event, machine, process);
free(event);
--
2.26.2
Adding --debuginfod option to specify debuginfod url and
support to do that through config file as well.
Use following in ~/.perfconfig file:
[buildid-cache]
debuginfod=http://192.168.122.174:8002
Signed-off-by: Jiri Olsa <[email protected]>
---
.../perf/Documentation/perf-buildid-cache.txt | 4 +++
tools/perf/builtin-buildid-cache.c | 28 +++++++++++++++++--
2 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
index b77da5138bca..0152d8b5cfbe 100644
--- a/tools/perf/Documentation/perf-buildid-cache.txt
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -84,6 +84,10 @@ OPTIONS
used when creating a uprobe for a process that resides in a
different mount namespace from the perf(1) utility.
+--debuginfod=URL::
+ Specify debuginfod URL to be used when retrieving perf.data binaries,
+ it follows the same syntax as the DEBUGINFOD_URLS variable.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-buildid-list[1]
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index e4a42aa2b497..59cb5fb85109 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -27,6 +27,7 @@
#include "util/time-utils.h"
#include "util/util.h"
#include "util/probe-file.h"
+#include "util/config.h"
#include <linux/string.h>
#include <linux/err.h>
#include <linux/zalloc.h>
@@ -545,12 +546,21 @@ build_id_cache__add_perf_data(const char *path, bool all)
return err;
}
+static int perf_buildid_cache_config(const char *var, const char *value, void *cb)
+{
+ const char **debuginfod = cb;
+
+ if (!strcmp(var, "buildid-cache.debuginfod"))
+ *debuginfod = strdup(value);
+
+ return 0;
+}
+
int cmd_buildid_cache(int argc, const char **argv)
{
struct strlist *list;
struct str_node *pos;
- int ret = 0;
- int ns_id = -1;
+ int ret, ns_id = -1;
bool force = false;
bool list_files = false;
bool opts_flag = false;
@@ -560,7 +570,8 @@ int cmd_buildid_cache(int argc, const char **argv)
*purge_name_list_str = NULL,
*missing_filename = NULL,
*update_name_list_str = NULL,
- *kcore_filename = NULL;
+ *kcore_filename = NULL,
+ *debuginfod = NULL;
char sbuf[STRERR_BUFSIZE];
struct perf_data data = {
@@ -585,6 +596,8 @@ int cmd_buildid_cache(int argc, const char **argv)
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_STRING('u', "update", &update_name_list_str, "file list",
"file(s) to update"),
+ OPT_STRING(0, "debuginfod", &debuginfod, "debuginfod url",
+ "set debuginfod url"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
OPT_END()
@@ -594,6 +607,10 @@ int cmd_buildid_cache(int argc, const char **argv)
NULL
};
+ ret = perf_config(perf_buildid_cache_config, &debuginfod);
+ if (ret)
+ return ret;
+
argc = parse_options(argc, argv, buildid_cache_options,
buildid_cache_usage, 0);
@@ -605,6 +622,11 @@ int cmd_buildid_cache(int argc, const char **argv)
if (argc || !(list_files || opts_flag))
usage_with_options(buildid_cache_usage, buildid_cache_options);
+ if (debuginfod) {
+ pr_debug("DEBUGINFOD_URLS=%s\n", debuginfod);
+ setenv("DEBUGINFOD_URLS", debuginfod, 1);
+ }
+
/* -l is exclusive. It can not be used with other options. */
if (list_files && opts_flag) {
usage_with_options_msg(buildid_cache_usage,
--
2.26.2
Adding build id to synthesized mmap2 events for
everything - kernel/modules/tasks.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/synthetic-events.c | 33 ++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index a18ae502d765..a9d5d1ff2cad 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -347,6 +347,32 @@ static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
}
}
+static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
+ bool is_kernel)
+{
+ struct build_id bid;
+ int rc;
+
+ if (is_kernel)
+ rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
+ else
+ rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
+
+ if (rc == 0) {
+ memcpy(event->build_id, bid.data, sizeof(bid.data));
+ event->build_id_size = (u8) bid.size;
+ } else {
+ if (event->filename[0] == '/') {
+ pr_debug2("Failed to read build ID for %s\n",
+ event->filename);
+ }
+ memset(event->build_id, 0x0, sizeof(event->build_id));
+ }
+ event->header.misc |= PERF_RECORD_MISC_BUILD_ID;
+ event->__reserved_1 = 0;
+ event->__reserved_2 = 0;
+}
+
int perf_event__synthesize_mmap_events(struct perf_tool *tool,
union perf_event *event,
pid_t pid, pid_t tgid,
@@ -453,6 +479,9 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
event->mmap2.pid = tgid;
event->mmap2.tid = pid;
+ if (symbol_conf.buildid_mmap2)
+ perf_record_mmap2__read_build_id(&event->mmap2, false);
+
if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
rc = -1;
break;
@@ -630,6 +659,8 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
memcpy(event->mmap2.filename, pos->dso->long_name,
pos->dso->long_name_len + 1);
+
+ perf_record_mmap2__read_build_id(&event->mmap2, false);
} else {
size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
event->mmap.header.type = PERF_RECORD_MMAP;
@@ -1050,6 +1081,8 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
event->mmap2.start = map->start;
event->mmap2.len = map->end - event->mmap.start;
event->mmap2.pid = machine->pid;
+
+ perf_record_mmap2__read_build_id(&event->mmap2, true);
} else {
size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
--
2.26.2
Adding build_id_cache__add function as core function
that adds file into build id database. It will be
sed from another callers in following changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/build-id.c | 42 ++++++++++++++++++++++++--------------
tools/perf/util/build-id.h | 2 ++
2 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index dc8f864fe15a..0d9a473c46d0 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -670,24 +670,15 @@ static char *build_id_cache__find_debug(const char *sbuild_id,
return realname;
}
-int build_id_cache__add_s(const char *sbuild_id, const char *name,
- struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
+int
+build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
+ struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
{
const size_t size = PATH_MAX;
- char *realname = NULL, *filename = NULL, *dir_name = NULL,
- *linkname = zalloc(size), *tmp;
+ char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
char *debugfile = NULL;
int err = -1;
- if (!is_kallsyms) {
- if (!is_vdso)
- realname = nsinfo__realpath(name, nsi);
- else
- realname = realpath(name, NULL);
- if (!realname)
- goto out_free;
- }
-
dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
is_vdso);
if (!dir_name)
@@ -783,8 +774,6 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
out_free:
- if (!is_kallsyms)
- free(realname);
free(filename);
free(debugfile);
free(dir_name);
@@ -792,6 +781,29 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
return err;
}
+int build_id_cache__add_s(const char *sbuild_id, const char *name,
+ struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
+{
+ char *realname = NULL;
+ int err = -1;
+
+ if (!is_kallsyms) {
+ if (!is_vdso)
+ realname = nsinfo__realpath(name, nsi);
+ else
+ realname = realpath(name, NULL);
+ if (!realname)
+ goto out_free;
+ }
+
+ err = build_id_cache__add(sbuild_id, name, realname, nsi, is_kallsyms, is_vdso);
+
+out_free:
+ if (!is_kallsyms)
+ free(realname);
+ return err;
+}
+
static int build_id_cache__add_b(const struct build_id *bid,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso)
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index c6f10e3d2152..02613f4b2c29 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -63,6 +63,8 @@ char *build_id_cache__complement(const char *incomplete_sbuild_id);
int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
struct strlist **result);
bool build_id_cache__cached(const char *sbuild_id);
+int build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
+ struct nsinfo *nsi, bool is_kallsyms, bool is_vdso);
int build_id_cache__add_s(const char *sbuild_id,
const char *name, struct nsinfo *nsi,
bool is_kallsyms, bool is_vdso);
--
2.26.2
Allow mmap2 event to synthesize kernel modules,
so we can synthesize module's build id data in
following changes.
It's enabled by new symbol_conf.buildid_mmap2
bool, which will be switched in following
changes.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/util/synthetic-events.c | 49 +++++++++++++++++++-----------
1 file changed, 32 insertions(+), 17 deletions(-)
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 872df6d6dbef..a18ae502d765 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -593,16 +593,17 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
int rc = 0;
struct map *pos;
struct maps *maps = machine__kernel_maps(machine);
- union perf_event *event = zalloc((sizeof(event->mmap) +
- machine->id_hdr_size));
+ union perf_event *event;
+ size_t size = symbol_conf.buildid_mmap2 ?
+ sizeof(event->mmap2) : sizeof(event->mmap);
+
+ event = zalloc(size + machine->id_hdr_size);
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
return -1;
}
- event->header.type = PERF_RECORD_MMAP;
-
/*
* kernel uses 0 for user space maps, see kernel/perf_event.c
* __perf_event_mmap
@@ -613,23 +614,37 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
maps__for_each_entry(maps, pos) {
- size_t size;
-
if (!__map__is_kmodule(pos))
continue;
- size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
- event->mmap.header.type = PERF_RECORD_MMAP;
- event->mmap.header.size = (sizeof(event->mmap) -
- (sizeof(event->mmap.filename) - size));
- memset(event->mmap.filename + size, 0, machine->id_hdr_size);
- event->mmap.header.size += machine->id_hdr_size;
- event->mmap.start = pos->start;
- event->mmap.len = pos->end - pos->start;
- event->mmap.pid = machine->pid;
+ if (symbol_conf.buildid_mmap2) {
+ size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
+ event->mmap2.header.type = PERF_RECORD_MMAP2;
+ event->mmap2.header.size = (sizeof(event->mmap2) -
+ (sizeof(event->mmap2.filename) - size));
+ memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
+ event->mmap2.header.size += machine->id_hdr_size;
+ event->mmap2.start = pos->start;
+ event->mmap2.len = pos->end - pos->start;
+ event->mmap2.pid = machine->pid;
+
+ memcpy(event->mmap2.filename, pos->dso->long_name,
+ pos->dso->long_name_len + 1);
+ } else {
+ size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
+ event->mmap.header.type = PERF_RECORD_MMAP;
+ event->mmap.header.size = (sizeof(event->mmap) -
+ (sizeof(event->mmap.filename) - size));
+ memset(event->mmap.filename + size, 0, machine->id_hdr_size);
+ event->mmap.header.size += machine->id_hdr_size;
+ event->mmap.start = pos->start;
+ event->mmap.len = pos->end - pos->start;
+ event->mmap.pid = machine->pid;
+
+ memcpy(event->mmap.filename, pos->dso->long_name,
+ pos->dso->long_name_len + 1);
+ }
- memcpy(event->mmap.filename, pos->dso->long_name,
- pos->dso->long_name_len + 1);
if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
rc = -1;
break;
--
2.26.2
On Mon, Nov 9, 2020 at 1:54 PM Jiri Olsa <[email protected]> wrote:
>
> It's possible to have other build id types (other than default
> SHA1). Currently there's also ld support for MD5 build id.
>
> Adding build_id_parse_size function, that returns also size of
> the parsed build id, so we can recognize the build id type.
>
> Cc: Alexei Starovoitov <[email protected]>
> Cc: Song Liu <[email protected]>
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
> include/linux/buildid.h | 2 ++
> lib/buildid.c | 31 ++++++++++++++++++++++++-------
> 2 files changed, 26 insertions(+), 7 deletions(-)
>
> diff --git a/include/linux/buildid.h b/include/linux/buildid.h
> index 3be5b49719f1..edba89834b4c 100644
> --- a/include/linux/buildid.h
> +++ b/include/linux/buildid.h
> @@ -7,5 +7,7 @@
> #define BUILD_ID_SIZE 20
>
> int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id);
> +int build_id_parse_size(struct vm_area_struct *vma, unsigned char *build_id,
> + __u32 *size);
I think it's too many choices for such trivial api.
Just keep one build_id_parse() with two outputs
and fix the callers.
On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> Adding support to carry build id data in mmap2 event.
>
> The build id data replaces maj/min/ino/ino_generation
> fields, whichc are also used to identify map's binary,
> so it's ok to replace them with build id data:
>
> union {
> struct {
> u32 maj;
> u32 min;
> u64 ino;
> u64 ino_generation;
> };
> struct {
> u8 build_id[20];
> u8 build_id_size;
What's the purpose of a size field for a fixed size array? Also, I'd
flip the order of these fields, first have the size and then the array.
> u8 __reserved_1;
> u16 __reserved_2;
> };
> };
>
> Replaced maj/min/ino/ino_generation fields give us size
> of 24 bytes. We use 20 bytes for build id data, 1 byte
> for size and rest is unused.
On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> There's new misc bit for mmap2 to signal there's build
> id data in it:
>
> #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
PERF_RECORD_MISC_MMAP_BUILD_ID would be consistent with the existing
PERF_RECORD_MISC_MMAP_DATA naming.
Also, AFAICT there's still a bunch of unused bits in misc.
012 CDEF
|||---------||||
Where:
0-2 CPUMODE_MASK
C PROC_MAP_PARSE_TIMEOUT
D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
E EXACT_IP / SCHED_OUT_PREEMPT
F (reserved)
Maybe we should put in a comment to keep track of the hole ?
Also, perhaps it is time to use F to indicate that @size is in 8 instead
of 1 ? That would increase our max entry size to 512K, people seem to
hit his 64K limit (insane as it is).
On Mon, Nov 09, 2020 at 04:15:42PM -0800, Alexei Starovoitov wrote:
> On Mon, Nov 9, 2020 at 1:54 PM Jiri Olsa <[email protected]> wrote:
> >
> > It's possible to have other build id types (other than default
> > SHA1). Currently there's also ld support for MD5 build id.
> >
> > Adding build_id_parse_size function, that returns also size of
> > the parsed build id, so we can recognize the build id type.
> >
> > Cc: Alexei Starovoitov <[email protected]>
> > Cc: Song Liu <[email protected]>
> > Signed-off-by: Jiri Olsa <[email protected]>
> > ---
> > include/linux/buildid.h | 2 ++
> > lib/buildid.c | 31 ++++++++++++++++++++++++-------
> > 2 files changed, 26 insertions(+), 7 deletions(-)
> >
> > diff --git a/include/linux/buildid.h b/include/linux/buildid.h
> > index 3be5b49719f1..edba89834b4c 100644
> > --- a/include/linux/buildid.h
> > +++ b/include/linux/buildid.h
> > @@ -7,5 +7,7 @@
> > #define BUILD_ID_SIZE 20
> >
> > int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id);
> > +int build_id_parse_size(struct vm_area_struct *vma, unsigned char *build_id,
> > + __u32 *size);
>
> I think it's too many choices for such trivial api.
> Just keep one build_id_parse() with two outputs
> and fix the callers.
>
ok, will do
jirka
On Tue, Nov 10, 2020 at 09:07:16AM +0100, Peter Zijlstra wrote:
> On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > Adding support to carry build id data in mmap2 event.
> >
> > The build id data replaces maj/min/ino/ino_generation
> > fields, whichc are also used to identify map's binary,
> > so it's ok to replace them with build id data:
> >
> > union {
> > struct {
> > u32 maj;
> > u32 min;
> > u64 ino;
> > u64 ino_generation;
> > };
> > struct {
> > u8 build_id[20];
> > u8 build_id_size;
>
> What's the purpose of a size field for a fixed size array? Also, I'd
at the moment there's SHA build id using 20 bytes and MD5 is using 16
bytes, so build_id_size tells which one is in
I was considering adding another enum instead, but buildid is defined
just by the size of the hash, so size seemed better.. if in future
there's another type added and fits within 20 bytes we're ok, if it's
bigger we're screwed anyway
> flip the order of these fields, first have the size and then the array.
ok
jirka
>
> > u8 __reserved_1;
> > u16 __reserved_2;
> > };
> > };
> >
> > Replaced maj/min/ino/ino_generation fields give us size
> > of 24 bytes. We use 20 bytes for build id data, 1 byte
> > for size and rest is unused.
>
On Tue, Nov 10, 2020 at 09:28:51AM +0100, Peter Zijlstra wrote:
> On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > There's new misc bit for mmap2 to signal there's build
> > id data in it:
> >
> > #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
>
> PERF_RECORD_MISC_MMAP_BUILD_ID would be consistent with the existing
> PERF_RECORD_MISC_MMAP_DATA naming.
ok
>
> Also, AFAICT there's still a bunch of unused bits in misc.
>
> 012 CDEF
> |||---------||||
>
> Where:
> 0-2 CPUMODE_MASK
>
> C PROC_MAP_PARSE_TIMEOUT
> D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
> E EXACT_IP / SCHED_OUT_PREEMPT
> F (reserved)
>
> Maybe we should put in a comment to keep track of the hole ?
ook
>
> Also, perhaps it is time to use F to indicate that @size is in 8 instead
> of 1 ? That would increase our max entry size to 512K, people seem to
> hit his 64K limit (insane as it is).
nice idea, todo updated ;-)
thanks,
jirka
Em Tue, Nov 10, 2020 at 09:07:16AM +0100, Peter Zijlstra escreveu:
> On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > Adding support to carry build id data in mmap2 event.
> >
> > The build id data replaces maj/min/ino/ino_generation
> > fields, whichc are also used to identify map's binary,
> > so it's ok to replace them with build id data:
> >
> > union {
> > struct {
> > u32 maj;
> > u32 min;
> > u64 ino;
> > u64 ino_generation;
> > };
> > struct {
> > u8 build_id[20];
> > u8 build_id_size;
>
> What's the purpose of a size field for a fixed size array? Also, I'd
> flip the order of these fields, first have the size and then the array.
There can be different types of build-ids, with different sizes,
flipping the order of the fields is indeed sensible, as we could then
support even larger build_ids if the need arises :)
- Arnaldo
> > u8 __reserved_1;
> > u16 __reserved_2;
> > };
> > };
> >
> > Replaced maj/min/ino/ino_generation fields give us size
> > of 24 bytes. We use 20 bytes for build id data, 1 byte
> > for size and rest is unused.
--
- Arnaldo
On Tue, Nov 10, 2020 at 08:54:26AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 10, 2020 at 09:07:16AM +0100, Peter Zijlstra escreveu:
> > On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > > Adding support to carry build id data in mmap2 event.
> > >
> > > The build id data replaces maj/min/ino/ino_generation
> > > fields, whichc are also used to identify map's binary,
> > > so it's ok to replace them with build id data:
> > >
> > > union {
> > > struct {
> > > u32 maj;
> > > u32 min;
> > > u64 ino;
> > > u64 ino_generation;
> > > };
> > > struct {
> > > u8 build_id[20];
> > > u8 build_id_size;
> >
> > What's the purpose of a size field for a fixed size array? Also, I'd
> > flip the order of these fields, first have the size and then the array.
>
> There can be different types of build-ids, with different sizes,
> flipping the order of the fields is indeed sensible, as we could then
> support even larger build_ids if the need arises :)
3 whole bytes.. whooo!
Em Tue, Nov 10, 2020 at 01:22:32PM +0100, Peter Zijlstra escreveu:
> On Tue, Nov 10, 2020 at 08:54:26AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Nov 10, 2020 at 09:07:16AM +0100, Peter Zijlstra escreveu:
> > > On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > > > Adding support to carry build id data in mmap2 event.
> > > > The build id data replaces maj/min/ino/ino_generation
> > > > fields, whichc are also used to identify map's binary,
> > > > so it's ok to replace them with build id data:
> > > > union {
> > > > struct {
> > > > u32 maj;
> > > > u32 min;
> > > > u64 ino;
> > > > u64 ino_generation;
> > > > };
> > > > struct {
> > > > u8 build_id[20];
> > > > u8 build_id_size;
> > > What's the purpose of a size field for a fixed size array? Also, I'd
> > > flip the order of these fields, first have the size and then the array.
> > There can be different types of build-ids, with different sizes,
> > flipping the order of the fields is indeed sensible, as we could then
> > support even larger build_ids if the need arises :)
> 3 whole bytes.. whooo!
Hey, I agreed with you, flip the order of the fields, right? :-)
- Arnaldo
On Tue, Nov 10, 2020 at 11:10:46AM +0100, Jiri Olsa wrote:
> On Tue, Nov 10, 2020 at 09:28:51AM +0100, Peter Zijlstra wrote:
> > On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > > There's new misc bit for mmap2 to signal there's build
> > > id data in it:
> > >
> > > #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
> >
> > PERF_RECORD_MISC_MMAP_BUILD_ID would be consistent with the existing
> > PERF_RECORD_MISC_MMAP_DATA naming.
>
> ok
>
> >
> > Also, AFAICT there's still a bunch of unused bits in misc.
> >
> > 012 CDEF
> > |||---------||||
> >
> > Where:
> > 0-2 CPUMODE_MASK
> >
> > C PROC_MAP_PARSE_TIMEOUT
> > D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
> > E EXACT_IP / SCHED_OUT_PREEMPT
> > F (reserved)
> >
> > Maybe we should put in a comment to keep track of the hole ?
>
> ook
how about the change below.. I also switch the build_id with the size,
but I kept the build_id size 20, because I think there's bigger chance
we will use those reserved bytes for something, than that we will need
those extra 3 bytes in build_id array
struct {
u8 build_id_size;
u8 __reserved_1;
u16 __reserved_2;
u8 build_id[20];
};
jirka
---
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index b95d3c485d27..45a216bea048 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -384,7 +384,8 @@ struct perf_event_attr {
aux_output : 1, /* generate AUX records instead of events */
cgroup : 1, /* include cgroup events */
text_poke : 1, /* include text poke events */
- __reserved_1 : 30;
+ build_id : 1, /* use build id in mmap2 events */
+ __reserved_1 : 29;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -657,6 +658,22 @@ struct perf_event_mmap_page {
__u64 aux_size;
};
+/*
+ * The current state of perf_event_header::misc bits usage:
+ * ('|' used bit, '-' unused bit)
+ *
+ * 012 CDEF
+ * |||---------||||
+ *
+ * Where:
+ * 0-2 CPUMODE_MASK
+ *
+ * C PROC_MAP_PARSE_TIMEOUT
+ * D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
+ * E MMAP_BUILD_ID / EXACT_IP / SCHED_OUT_PREEMPT
+ * F (reserved)
+ */
+
#define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
#define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
#define PERF_RECORD_MISC_KERNEL (1 << 0)
@@ -688,6 +705,7 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_EXACT_IP - PERF_RECORD_SAMPLE of precise events
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT - PERF_RECORD_SWITCH* events
+ * PERF_RECORD_MISC_MMAP_BUILD_ID - PERF_RECORD_MMAP2 event
*
*
* PERF_RECORD_MISC_EXACT_IP:
@@ -697,9 +715,13 @@ struct perf_event_mmap_page {
*
* PERF_RECORD_MISC_SWITCH_OUT_PREEMPT:
* Indicates that thread was preempted in TASK_RUNNING state.
+ *
+ * PERF_RECORD_MISC_MMAP_BUILD_ID:
+ * Indicates that mmap2 event carries build id data.
*/
#define PERF_RECORD_MISC_EXACT_IP (1 << 14)
#define PERF_RECORD_MISC_SWITCH_OUT_PREEMPT (1 << 14)
+#define PERF_RECORD_MISC_MMAP_BUILD_ID (1 << 14)
/*
* Reserve the last bit to indicate some extended misc field
*/
@@ -911,10 +933,20 @@ enum perf_event_type {
* u64 addr;
* u64 len;
* u64 pgoff;
- * u32 maj;
- * u32 min;
- * u64 ino;
- * u64 ino_generation;
+ * union {
+ * struct {
+ * u32 maj;
+ * u32 min;
+ * u64 ino;
+ * u64 ino_generation;
+ * };
+ * struct {
+ * u8 build_id_size;
+ * u8 __reserved_1;
+ * u16 __reserved_2;
+ * u8 build_id[20];
+ * };
+ * };
* u32 prot, flags;
* char filename[];
* struct sample_id sample_id;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index da467e1dd49a..5b2b8ec82399 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -51,6 +51,7 @@
#include <linux/proc_ns.h>
#include <linux/mount.h>
#include <linux/min_heap.h>
+#include <linux/buildid.h>
#include "internal.h"
@@ -395,6 +396,7 @@ static atomic_t nr_ksymbol_events __read_mostly;
static atomic_t nr_bpf_events __read_mostly;
static atomic_t nr_cgroup_events __read_mostly;
static atomic_t nr_text_poke_events __read_mostly;
+static atomic_t nr_build_id_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4672,6 +4674,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (event->attr.mmap || event->attr.mmap_data)
atomic_dec(&nr_mmap_events);
+ if (event->attr.build_id)
+ atomic_dec(&nr_build_id_events);
if (event->attr.comm)
atomic_dec(&nr_comm_events);
if (event->attr.namespaces)
@@ -7942,6 +7946,8 @@ struct perf_mmap_event {
u64 ino;
u64 ino_generation;
u32 prot, flags;
+ u8 build_id[BUILD_ID_SIZE];
+ u32 build_id_size;
struct {
struct perf_event_header header;
@@ -7997,13 +8003,23 @@ static void perf_event_mmap_output(struct perf_event *event,
mmap_event->event_id.pid = perf_event_pid(event, current);
mmap_event->event_id.tid = perf_event_tid(event, current);
+ if (event->attr.mmap2 && event->attr.build_id)
+ mmap_event->event_id.header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
+
perf_output_put(&handle, mmap_event->event_id);
if (event->attr.mmap2) {
- perf_output_put(&handle, mmap_event->maj);
- perf_output_put(&handle, mmap_event->min);
- perf_output_put(&handle, mmap_event->ino);
- perf_output_put(&handle, mmap_event->ino_generation);
+ if (event->attr.build_id) {
+ u8 size[4] = { (u8) mmap_event->build_id_size, 0, 0, 0 };
+
+ __output_copy(&handle, size, 4);
+ __output_copy(&handle, mmap_event->build_id, BUILD_ID_SIZE);
+ } else {
+ perf_output_put(&handle, mmap_event->maj);
+ perf_output_put(&handle, mmap_event->min);
+ perf_output_put(&handle, mmap_event->ino);
+ perf_output_put(&handle, mmap_event->ino_generation);
+ }
perf_output_put(&handle, mmap_event->prot);
perf_output_put(&handle, mmap_event->flags);
}
@@ -8132,6 +8148,9 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
+ if (atomic_read(&nr_build_id_events))
+ build_id_parse(vma, mmap_event->build_id, &mmap_event->build_id_size);
+
perf_iterate_sb(perf_event_mmap_output,
mmap_event,
NULL);
@@ -11069,6 +11088,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (event->attr.mmap || event->attr.mmap_data)
atomic_inc(&nr_mmap_events);
+ if (event->attr.build_id)
+ atomic_inc(&nr_build_id_events);
if (event->attr.comm)
atomic_inc(&nr_comm_events);
if (event->attr.namespaces)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 768888b9326a..1bcf51e24979 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -482,6 +482,9 @@ Specify vmlinux path which has debuginfo.
--buildid-all::
Record build-id of all DSOs regardless whether it's actually hit or not.
+--buildid-mmap::
+Record build ids in mmap2 events, disables build id cache (implies --no-buildid).
+
--aio[=n]::
Use <n> control blocks in asynchronous (Posix AIO) trace writing mode (default: 1, max: 4).
Asynchronous mode is supported only when linking Perf tool with libc library
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index adf311d15d3d..47bae9d82d43 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -102,6 +102,7 @@ struct record {
bool no_buildid_cache;
bool no_buildid_cache_set;
bool buildid_all;
+ bool buildid_mmap;
bool timestamp_filename;
bool timestamp_boundary;
struct switch_output switch_output;
@@ -2139,6 +2140,8 @@ static int perf_record_config(const char *var, const char *value, void *cb)
rec->no_buildid_cache = true;
else if (!strcmp(value, "skip"))
rec->no_buildid = true;
+ else if (!strcmp(value, "mmap"))
+ rec->buildid_mmap = true;
else
return -1;
return 0;
@@ -2554,6 +2557,8 @@ static struct option __record_options[] = {
"file", "vmlinux pathname"),
OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
"Record build-id of all DSOs regardless of hits"),
+ OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
+ "Record build-id in map events"),
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
"append timestamp to output filename"),
OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
@@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
}
+ if (rec->buildid_mmap) {
+ if (!perf_can_record_build_id()) {
+ pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
+ err = -EINVAL;
+ goto out_opts;
+ }
+ pr_debug("Enabling build id in mmap2 events.\n");
+ /* Enable mmap build id synthesizing. */
+ symbol_conf.buildid_mmap2 = true;
+ /* Enable perf_event_attr::build_id bit. */
+ rec->opts.build_id = true;
+ /* Disable build id cache. */
+ rec->no_buildid = true;
+ }
+
if (rec->opts.kcore)
rec->data.is_dir = true;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1cad6051d8b0..749d806ee1d1 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1170,10 +1170,12 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
if (opts->sample_weight)
evsel__set_sample_bit(evsel, WEIGHT);
- attr->task = track;
- attr->mmap = track;
- attr->mmap2 = track && !perf_missing_features.mmap2;
- attr->comm = track;
+ attr->task = track;
+ attr->mmap = track;
+ attr->mmap2 = track && !perf_missing_features.mmap2;
+ attr->comm = track;
+ attr->build_id = track && opts->build_id;
+
/*
* ksymbol is tracked separately with text poke because it needs to be
* system wide and enabled immediately.
diff --git a/tools/perf/util/perf_api_probe.c b/tools/perf/util/perf_api_probe.c
index 3840d02f0f7b..829af17a0867 100644
--- a/tools/perf/util/perf_api_probe.c
+++ b/tools/perf/util/perf_api_probe.c
@@ -98,6 +98,11 @@ static void perf_probe_text_poke(struct evsel *evsel)
evsel->core.attr.text_poke = 1;
}
+static void perf_probe_build_id(struct evsel *evsel)
+{
+ evsel->core.attr.build_id = 1;
+}
+
bool perf_can_sample_identifier(void)
{
return perf_probe_api(perf_probe_sample_identifier);
@@ -172,3 +177,8 @@ bool perf_can_aux_sample(void)
return true;
}
+
+bool perf_can_record_build_id(void)
+{
+ return perf_probe_api(perf_probe_build_id);
+}
diff --git a/tools/perf/util/perf_api_probe.h b/tools/perf/util/perf_api_probe.h
index d5506a983a94..f12ca55f509a 100644
--- a/tools/perf/util/perf_api_probe.h
+++ b/tools/perf/util/perf_api_probe.h
@@ -11,5 +11,6 @@ bool perf_can_record_cpu_wide(void);
bool perf_can_record_switch_events(void);
bool perf_can_record_text_poke_events(void);
bool perf_can_sample_identifier(void);
+bool perf_can_record_build_id(void);
#endif // __PERF_API_PROBE_H
diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index e67a227c0ce7..0f1c62d40a89 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -134,6 +134,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(bpf_event, p_unsigned);
PRINT_ATTRf(aux_output, p_unsigned);
PRINT_ATTRf(cgroup, p_unsigned);
+ PRINT_ATTRf(build_id, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 266760ac9143..609e706f4282 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -49,6 +49,7 @@ struct record_opts {
bool no_bpf_event;
bool kcore;
bool text_poke;
+ bool build_id;
unsigned int freq;
unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages;
Em Tue, Nov 10, 2020 at 07:23:34PM +0100, Jiri Olsa escreveu:
> On Tue, Nov 10, 2020 at 11:10:46AM +0100, Jiri Olsa wrote:
> > On Tue, Nov 10, 2020 at 09:28:51AM +0100, Peter Zijlstra wrote:
> > > On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > > > There's new misc bit for mmap2 to signal there's build
> > > > id data in it:
> > > >
> > > > #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
> > >
> > > PERF_RECORD_MISC_MMAP_BUILD_ID would be consistent with the existing
> > > PERF_RECORD_MISC_MMAP_DATA naming.
Agreed.
> > ok
> > >
> > > Also, AFAICT there's still a bunch of unused bits in misc.
> > >
> > > 012 CDEF
> > > |||---------||||
> > >
> > > Where:
> > > 0-2 CPUMODE_MASK
> > >
> > > C PROC_MAP_PARSE_TIMEOUT
> > > D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
> > > E EXACT_IP / SCHED_OUT_PREEMPT
> > > F (reserved)
> > >
> > > Maybe we should put in a comment to keep track of the hole ?
> >
> > ook
>
> how about the change below.. I also switch the build_id with the size,
> but I kept the build_id size 20, because I think there's bigger chance
> we will use those reserved bytes for something, than that we will need
> those extra 3 bytes in build_id array
>
> struct {
> u8 build_id_size;
> u8 __reserved_1;
> u16 __reserved_2;
> u8 build_id[20];
> };
For "maybe we'll use it for something else" doesn't require that it gets
before build_id, i.e. to use it for something else it can be as above or
struct {
u8 build_id_size;
u8 build_id[20];
u8 __reserved_1;
u16 __reserved_2;
};
that groups build_id size with it, but nah, this is getting funny by
now.
My suggestion was not about increasing build_id to 23, just to leave the
unused (reserved) bytes after it.
- Arnaldo
On Tue, Nov 10, 2020 at 03:55:06PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 10, 2020 at 07:23:34PM +0100, Jiri Olsa escreveu:
> > On Tue, Nov 10, 2020 at 11:10:46AM +0100, Jiri Olsa wrote:
> > > On Tue, Nov 10, 2020 at 09:28:51AM +0100, Peter Zijlstra wrote:
> > > > On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> > > > > There's new misc bit for mmap2 to signal there's build
> > > > > id data in it:
> > > > >
> > > > > #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
> > > >
> > > > PERF_RECORD_MISC_MMAP_BUILD_ID would be consistent with the existing
> > > > PERF_RECORD_MISC_MMAP_DATA naming.
>
> Agreed.
>
> > > ok
>
> > > >
> > > > Also, AFAICT there's still a bunch of unused bits in misc.
> > > >
> > > > 012 CDEF
> > > > |||---------||||
> > > >
> > > > Where:
> > > > 0-2 CPUMODE_MASK
> > > >
> > > > C PROC_MAP_PARSE_TIMEOUT
> > > > D MMAP_DATA / COMM_EXEC / FORK_EXEC / SWITCH_OUT
> > > > E EXACT_IP / SCHED_OUT_PREEMPT
> > > > F (reserved)
> > > >
> > > > Maybe we should put in a comment to keep track of the hole ?
> > >
> > > ook
> >
> > how about the change below.. I also switch the build_id with the size,
> > but I kept the build_id size 20, because I think there's bigger chance
> > we will use those reserved bytes for something, than that we will need
> > those extra 3 bytes in build_id array
> >
> > struct {
> > u8 build_id_size;
> > u8 __reserved_1;
> > u16 __reserved_2;
> > u8 build_id[20];
> > };
>
> For "maybe we'll use it for something else" doesn't require that it gets
> before build_id, i.e. to use it for something else it can be as above or
>
> struct {
> u8 build_id_size;
> u8 build_id[20];
> u8 __reserved_1;
> u16 __reserved_2;
> };
>
> that groups build_id size with it, but nah, this is getting funny by
> now.
yep, that's why I kept it like above
>
> My suggestion was not about increasing build_id to 23, just to leave the
> unused (reserved) bytes after it.
ok, thanks
jirka
On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> Adding --buildid-mmap option to enable build id in mmap2 events.
> It will only work if there's kernel support for that and it disables
> build id cache (implies --no-buildid).
What's the point of the option? Why not enable it by default
if the kernel supports it?
With the option most user won't get the benefit.
The only reason I can think of for an option would be to disable
so that old tools can still process.
-Andi
On Wed, Nov 11, 2020 at 09:00:46AM -0800, Andi Kleen wrote:
> On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > Adding --buildid-mmap option to enable build id in mmap2 events.
> > It will only work if there's kernel support for that and it disables
> > build id cache (implies --no-buildid).
>
> What's the point of the option? Why not enable it by default
> if the kernel supports it?
>
> With the option most user won't get the benefit.
>
> The only reason I can think of for an option would be to disable
> so that old tools can still process.
yes, that was request in the rfc post, we want the new default
perf.data be still readable by older perf tools
jirka
Em Thu, Nov 12, 2020 at 12:57:10PM +0100, Jiri Olsa escreveu:
> On Wed, Nov 11, 2020 at 09:00:46AM -0800, Andi Kleen wrote:
> > On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > > Adding --buildid-mmap option to enable build id in mmap2 events.
> > > It will only work if there's kernel support for that and it disables
> > > build id cache (implies --no-buildid).
> > What's the point of the option? Why not enable it by default
> > if the kernel supports it?
> > With the option most user won't get the benefit.
> > The only reason I can think of for an option would be to disable
> > so that old tools can still process.
> yes, that was request in the rfc post, we want the new default
> perf.data be still readable by older perf tools
We need to change perf so that when it finds some option it doesn't
grok, it just ignores extra things in a record like MMAP2 and just warns
the user that things are being ignored.
So that we can add new stuff by default without requiring an ever longer
command line option, like with --all-cgroups, etc.
And provide the options to avoid using new stuff if we know that the
perf.data file will be processed by someone with an older tool that
can't update.
- Arnaldo
On Thu, Nov 12, 2020 at 05:39:52PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Nov 12, 2020 at 12:57:10PM +0100, Jiri Olsa escreveu:
> > On Wed, Nov 11, 2020 at 09:00:46AM -0800, Andi Kleen wrote:
> > > On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > > > Adding --buildid-mmap option to enable build id in mmap2 events.
> > > > It will only work if there's kernel support for that and it disables
> > > > build id cache (implies --no-buildid).
>
> > > What's the point of the option? Why not enable it by default
> > > if the kernel supports it?
>
> > > With the option most user won't get the benefit.
>
> > > The only reason I can think of for an option would be to disable
> > > so that old tools can still process.
>
> > yes, that was request in the rfc post, we want the new default
> > perf.data be still readable by older perf tools
>
> We need to change perf so that when it finds some option it doesn't
> grok, it just ignores extra things in a record like MMAP2 and just warns
> the user that things are being ignored.
>
> So that we can add new stuff by default without requiring an ever longer
> command line option, like with --all-cgroups, etc.
>
> And provide the options to avoid using new stuff if we know that the
> perf.data file will be processed by someone with an older tool that
> can't update.
hum, can we just stop being this way compatible? ;-)
I can't see too much benefit in it, but not sure how common is
to report perf.data with older perf than it was recorded with
most of the time it will probably work anyway, just big changes
list this one will screw that
jirka
Hi Jiri,
On Mon, Nov 09, 2020 at 10:53:54PM +0100, Jiri Olsa wrote:
> Adding support to carry build id data in mmap2 event.
>
> The build id data replaces maj/min/ino/ino_generation
> fields, whichc are also used to identify map's binary,
> so it's ok to replace them with build id data:
>
> union {
> struct {
> u32 maj;
> u32 min;
> u64 ino;
> u64 ino_generation;
> };
> struct {
> u8 build_id[20];
> u8 build_id_size;
> u8 __reserved_1;
> u16 __reserved_2;
> };
> };
>
> Replaced maj/min/ino/ino_generation fields give us size
> of 24 bytes. We use 20 bytes for build id data, 1 byte
> for size and rest is unused.
>
> There's new misc bit for mmap2 to signal there's build
> id data in it:
>
> #define PERF_RECORD_MISC_BUILD_ID (1 << 14)
>
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
[SNIP]
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index da467e1dd49a..808473b6ce85 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -51,6 +51,7 @@
> #include <linux/proc_ns.h>
> #include <linux/mount.h>
> #include <linux/min_heap.h>
> +#include <linux/buildid.h>
>
> #include "internal.h"
>
> @@ -395,6 +396,7 @@ static atomic_t nr_ksymbol_events __read_mostly;
> static atomic_t nr_bpf_events __read_mostly;
> static atomic_t nr_cgroup_events __read_mostly;
> static atomic_t nr_text_poke_events __read_mostly;
> +static atomic_t nr_build_id_events __read_mostly;
>
> static LIST_HEAD(pmus);
> static DEFINE_MUTEX(pmus_lock);
> @@ -4672,6 +4674,8 @@ static void unaccount_event(struct perf_event *event)
> dec = true;
> if (event->attr.mmap || event->attr.mmap_data)
> atomic_dec(&nr_mmap_events);
> + if (event->attr.build_id)
> + atomic_dec(&nr_build_id_events);
> if (event->attr.comm)
> atomic_dec(&nr_comm_events);
> if (event->attr.namespaces)
> @@ -7942,6 +7946,8 @@ struct perf_mmap_event {
> u64 ino;
> u64 ino_generation;
> u32 prot, flags;
> + u8 build_id[BUILD_ID_SIZE];
> + u32 build_id_size;
>
> struct {
> struct perf_event_header header;
> @@ -7997,13 +8003,23 @@ static void perf_event_mmap_output(struct perf_event *event,
> mmap_event->event_id.pid = perf_event_pid(event, current);
> mmap_event->event_id.tid = perf_event_tid(event, current);
>
> + if (event->attr.mmap2 && event->attr.build_id)
> + mmap_event->event_id.header.misc |= PERF_RECORD_MISC_BUILD_ID;
> +
> perf_output_put(&handle, mmap_event->event_id);
>
> if (event->attr.mmap2) {
> - perf_output_put(&handle, mmap_event->maj);
> - perf_output_put(&handle, mmap_event->min);
> - perf_output_put(&handle, mmap_event->ino);
> - perf_output_put(&handle, mmap_event->ino_generation);
> + if (event->attr.build_id) {
> + u8 size[4] = { (u8) mmap_event->build_id_size, 0, 0, 0 };
> +
> + __output_copy(&handle, mmap_event->build_id, BUILD_ID_SIZE);
> + __output_copy(&handle, size, 4);
> + } else {
> + perf_output_put(&handle, mmap_event->maj);
> + perf_output_put(&handle, mmap_event->min);
> + perf_output_put(&handle, mmap_event->ino);
> + perf_output_put(&handle, mmap_event->ino_generation);
> + }
> perf_output_put(&handle, mmap_event->prot);
> perf_output_put(&handle, mmap_event->flags);
> }
> @@ -8132,6 +8148,11 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
>
> mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
>
> + if (atomic_read(&nr_build_id_events)) {
> + build_id_parse_size(vma, mmap_event->build_id,
> + &mmap_event->build_id_size);
This can fail, right? Then we need to fallback to use dev/ino..
Thanks,
Namhyung
> + }
> +
> perf_iterate_sb(perf_event_mmap_output,
> mmap_event,
> NULL);
> @@ -11069,6 +11090,8 @@ static void account_event(struct perf_event *event)
> inc = true;
> if (event->attr.mmap || event->attr.mmap_data)
> atomic_inc(&nr_mmap_events);
> + if (event->attr.build_id)
> + atomic_inc(&nr_build_id_events);
> if (event->attr.comm)
> atomic_inc(&nr_comm_events);
> if (event->attr.namespaces)
> --
> 2.26.2
>
On Mon, Nov 09, 2020 at 10:54:06PM +0100, Jiri Olsa wrote:
> Adding build id to synthesized mmap2 events for
> everything - kernel/modules/tasks.
>
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
> tools/perf/util/synthetic-events.c | 33 ++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> index a18ae502d765..a9d5d1ff2cad 100644
> --- a/tools/perf/util/synthetic-events.c
> +++ b/tools/perf/util/synthetic-events.c
> @@ -347,6 +347,32 @@ static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
> }
> }
>
> +static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
> + bool is_kernel)
> +{
> + struct build_id bid;
> + int rc;
> +
> + if (is_kernel)
> + rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
> + else
> + rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
> +
> + if (rc == 0) {
> + memcpy(event->build_id, bid.data, sizeof(bid.data));
> + event->build_id_size = (u8) bid.size;
> + } else {
> + if (event->filename[0] == '/') {
> + pr_debug2("Failed to read build ID for %s\n",
> + event->filename);
> + }
> + memset(event->build_id, 0x0, sizeof(event->build_id));
Likewise, we should not set the misc bit here IMHO.
Thanks,
Namhyung
> + }
> + event->header.misc |= PERF_RECORD_MISC_BUILD_ID;
> + event->__reserved_1 = 0;
> + event->__reserved_2 = 0;
> +}
> +
> int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> union perf_event *event,
> pid_t pid, pid_t tgid,
> @@ -453,6 +479,9 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> event->mmap2.pid = tgid;
> event->mmap2.tid = pid;
>
> + if (symbol_conf.buildid_mmap2)
> + perf_record_mmap2__read_build_id(&event->mmap2, false);
> +
> if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
> rc = -1;
> break;
> @@ -630,6 +659,8 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
>
> memcpy(event->mmap2.filename, pos->dso->long_name,
> pos->dso->long_name_len + 1);
> +
> + perf_record_mmap2__read_build_id(&event->mmap2, false);
> } else {
> size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
> event->mmap.header.type = PERF_RECORD_MMAP;
> @@ -1050,6 +1081,8 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
> event->mmap2.start = map->start;
> event->mmap2.len = map->end - event->mmap.start;
> event->mmap2.pid = machine->pid;
> +
> + perf_record_mmap2__read_build_id(&event->mmap2, true);
> } else {
> size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
> "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
> --
> 2.26.2
>
On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> Adding --buildid-mmap option to enable build id in mmap2 events.
> It will only work if there's kernel support for that and it disables
> build id cache (implies --no-buildid).
>
> It's also possible to enable it permanently via config option
> in ~.perfconfig file:
>
> [record]
> build-id=mmap
You also need to update the documentation.
>
> Also added build_id bit in the verbose output for perf_event_attr:
>
> # perf record --buildid-mmap -vv
> ...
> perf_event_attr:
> type 1
> size 120
> ...
> build_id 1
>
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
> tools/perf/Documentation/perf-record.txt | 3 +++
> tools/perf/builtin-record.c | 20 ++++++++++++++++++++
> tools/perf/util/evsel.c | 10 ++++++----
> tools/perf/util/perf_api_probe.c | 10 ++++++++++
> tools/perf/util/perf_api_probe.h | 1 +
> tools/perf/util/perf_event_attr_fprintf.c | 1 +
> tools/perf/util/record.h | 1 +
> 7 files changed, 42 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 768888b9326a..1bcf51e24979 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -482,6 +482,9 @@ Specify vmlinux path which has debuginfo.
> --buildid-all::
> Record build-id of all DSOs regardless whether it's actually hit or not.
>
> +--buildid-mmap::
> +Record build ids in mmap2 events, disables build id cache (implies --no-buildid).
> +
> --aio[=n]::
> Use <n> control blocks in asynchronous (Posix AIO) trace writing mode (default: 1, max: 4).
> Asynchronous mode is supported only when linking Perf tool with libc library
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index adf311d15d3d..47bae9d82d43 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -102,6 +102,7 @@ struct record {
> bool no_buildid_cache;
> bool no_buildid_cache_set;
> bool buildid_all;
> + bool buildid_mmap;
> bool timestamp_filename;
> bool timestamp_boundary;
> struct switch_output switch_output;
> @@ -2139,6 +2140,8 @@ static int perf_record_config(const char *var, const char *value, void *cb)
> rec->no_buildid_cache = true;
> else if (!strcmp(value, "skip"))
> rec->no_buildid = true;
> + else if (!strcmp(value, "mmap"))
> + rec->buildid_mmap = true;
> else
> return -1;
> return 0;
> @@ -2554,6 +2557,8 @@ static struct option __record_options[] = {
> "file", "vmlinux pathname"),
> OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
> "Record build-id of all DSOs regardless of hits"),
> + OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
> + "Record build-id in map events"),
> OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
> "append timestamp to output filename"),
> OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
> @@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
>
> }
>
> + if (rec->buildid_mmap) {
> + if (!perf_can_record_build_id()) {
> + pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
> + err = -EINVAL;
> + goto out_opts;
> + }
> + pr_debug("Enabling build id in mmap2 events.\n");
> + /* Enable mmap build id synthesizing. */
> + symbol_conf.buildid_mmap2 = true;
> + /* Enable perf_event_attr::build_id bit. */
> + rec->opts.build_id = true;
> + /* Disable build id cache. */
> + rec->no_buildid = true;
I'm afraid this can make it miss some build-id in the end because of
the possibility of the failure.
> + }
> +
> if (rec->opts.kcore)
> rec->data.is_dir = true;
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 1cad6051d8b0..749d806ee1d1 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1170,10 +1170,12 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
> if (opts->sample_weight)
> evsel__set_sample_bit(evsel, WEIGHT);
>
> - attr->task = track;
> - attr->mmap = track;
> - attr->mmap2 = track && !perf_missing_features.mmap2;
> - attr->comm = track;
> + attr->task = track;
> + attr->mmap = track;
> + attr->mmap2 = track && !perf_missing_features.mmap2;
> + attr->comm = track;
> + attr->build_id = track && opts->build_id;
> +
> /*
> * ksymbol is tracked separately with text poke because it needs to be
> * system wide and enabled immediately.
> diff --git a/tools/perf/util/perf_api_probe.c b/tools/perf/util/perf_api_probe.c
> index 3840d02f0f7b..829af17a0867 100644
> --- a/tools/perf/util/perf_api_probe.c
> +++ b/tools/perf/util/perf_api_probe.c
> @@ -98,6 +98,11 @@ static void perf_probe_text_poke(struct evsel *evsel)
> evsel->core.attr.text_poke = 1;
> }
>
> +static void perf_probe_build_id(struct evsel *evsel)
> +{
> + evsel->core.attr.build_id = 1;
> +}
> +
> bool perf_can_sample_identifier(void)
> {
> return perf_probe_api(perf_probe_sample_identifier);
> @@ -172,3 +177,8 @@ bool perf_can_aux_sample(void)
>
> return true;
> }
> +
> +bool perf_can_record_build_id(void)
> +{
> + return perf_probe_api(perf_probe_build_id);
> +}
> diff --git a/tools/perf/util/perf_api_probe.h b/tools/perf/util/perf_api_probe.h
> index d5506a983a94..f12ca55f509a 100644
> --- a/tools/perf/util/perf_api_probe.h
> +++ b/tools/perf/util/perf_api_probe.h
> @@ -11,5 +11,6 @@ bool perf_can_record_cpu_wide(void);
> bool perf_can_record_switch_events(void);
> bool perf_can_record_text_poke_events(void);
> bool perf_can_sample_identifier(void);
> +bool perf_can_record_build_id(void);
>
> #endif // __PERF_API_PROBE_H
> diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
> index e67a227c0ce7..0f1c62d40a89 100644
> --- a/tools/perf/util/perf_event_attr_fprintf.c
> +++ b/tools/perf/util/perf_event_attr_fprintf.c
> @@ -134,6 +134,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
> PRINT_ATTRf(bpf_event, p_unsigned);
> PRINT_ATTRf(aux_output, p_unsigned);
> PRINT_ATTRf(cgroup, p_unsigned);
> + PRINT_ATTRf(build_id, p_unsigned);
You might want to add the missing text_poke bit too. :)
Thanks,
Namhyung
>
> PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
> PRINT_ATTRf(bp_type, p_unsigned);
> diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
> index 266760ac9143..609e706f4282 100644
> --- a/tools/perf/util/record.h
> +++ b/tools/perf/util/record.h
> @@ -49,6 +49,7 @@ struct record_opts {
> bool no_bpf_event;
> bool kcore;
> bool text_poke;
> + bool build_id;
> unsigned int freq;
> unsigned int mmap_pages;
> unsigned int auxtrace_mmap_pages;
> --
> 2.26.2
>
On Fri, Nov 13, 2020 at 01:29:35PM +0900, Namhyung Kim wrote:
SNIP
> >
> > struct {
> > struct perf_event_header header;
> > @@ -7997,13 +8003,23 @@ static void perf_event_mmap_output(struct perf_event *event,
> > mmap_event->event_id.pid = perf_event_pid(event, current);
> > mmap_event->event_id.tid = perf_event_tid(event, current);
> >
> > + if (event->attr.mmap2 && event->attr.build_id)
> > + mmap_event->event_id.header.misc |= PERF_RECORD_MISC_BUILD_ID;
> > +
> > perf_output_put(&handle, mmap_event->event_id);
> >
> > if (event->attr.mmap2) {
> > - perf_output_put(&handle, mmap_event->maj);
> > - perf_output_put(&handle, mmap_event->min);
> > - perf_output_put(&handle, mmap_event->ino);
> > - perf_output_put(&handle, mmap_event->ino_generation);
> > + if (event->attr.build_id) {
> > + u8 size[4] = { (u8) mmap_event->build_id_size, 0, 0, 0 };
> > +
> > + __output_copy(&handle, mmap_event->build_id, BUILD_ID_SIZE);
> > + __output_copy(&handle, size, 4);
> > + } else {
> > + perf_output_put(&handle, mmap_event->maj);
> > + perf_output_put(&handle, mmap_event->min);
> > + perf_output_put(&handle, mmap_event->ino);
> > + perf_output_put(&handle, mmap_event->ino_generation);
> > + }
> > perf_output_put(&handle, mmap_event->prot);
> > perf_output_put(&handle, mmap_event->flags);
> > }
> > @@ -8132,6 +8148,11 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
> >
> > mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
> >
> > + if (atomic_read(&nr_build_id_events)) {
> > + build_id_parse_size(vma, mmap_event->build_id,
> > + &mmap_event->build_id_size);
>
> This can fail, right? Then we need to fallback to use dev/ino..
right, I did not implemented fallback in here, but I think
you are right.. we should try to do the best in fail, I'll add it
thanks,
jirka
On Fri, Nov 13, 2020 at 01:32:22PM +0900, Namhyung Kim wrote:
> On Mon, Nov 09, 2020 at 10:54:06PM +0100, Jiri Olsa wrote:
> > Adding build id to synthesized mmap2 events for
> > everything - kernel/modules/tasks.
> >
> > Signed-off-by: Jiri Olsa <[email protected]>
> > ---
> > tools/perf/util/synthetic-events.c | 33 ++++++++++++++++++++++++++++++
> > 1 file changed, 33 insertions(+)
> >
> > diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> > index a18ae502d765..a9d5d1ff2cad 100644
> > --- a/tools/perf/util/synthetic-events.c
> > +++ b/tools/perf/util/synthetic-events.c
> > @@ -347,6 +347,32 @@ static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
> > }
> > }
> >
> > +static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
> > + bool is_kernel)
> > +{
> > + struct build_id bid;
> > + int rc;
> > +
> > + if (is_kernel)
> > + rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
> > + else
> > + rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
> > +
> > + if (rc == 0) {
> > + memcpy(event->build_id, bid.data, sizeof(bid.data));
> > + event->build_id_size = (u8) bid.size;
> > + } else {
> > + if (event->filename[0] == '/') {
> > + pr_debug2("Failed to read build ID for %s\n",
> > + event->filename);
> > + }
> > + memset(event->build_id, 0x0, sizeof(event->build_id));
>
> Likewise, we should not set the misc bit here IMHO.
right, will implement the fallback
jirka
On Fri, Nov 13, 2020 at 01:40:00PM +0900, Namhyung Kim wrote:
> On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > Adding --buildid-mmap option to enable build id in mmap2 events.
> > It will only work if there's kernel support for that and it disables
> > build id cache (implies --no-buildid).
> >
> > It's also possible to enable it permanently via config option
> > in ~.perfconfig file:
> >
> > [record]
> > build-id=mmap
>
> You also need to update the documentation.
right, forgot doc for the config option
SNIP
> > "append timestamp to output filename"),
> > OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
> > @@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
> >
> > }
> >
> > + if (rec->buildid_mmap) {
> > + if (!perf_can_record_build_id()) {
> > + pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
> > + err = -EINVAL;
> > + goto out_opts;
> > + }
> > + pr_debug("Enabling build id in mmap2 events.\n");
> > + /* Enable mmap build id synthesizing. */
> > + symbol_conf.buildid_mmap2 = true;
> > + /* Enable perf_event_attr::build_id bit. */
> > + rec->opts.build_id = true;
> > + /* Disable build id cache. */
> > + rec->no_buildid = true;
>
> I'm afraid this can make it miss some build-id in the end because of
> the possibility of the failure.
with following fix (already merged):
b33164f2bd1c bpf: Iterate through all PT_NOTE sections when looking for build id
I could see high rate of build id being retrieved
I'll make new numbers for next version, but I think we can neglect
the failure, considering that we pick only 'hit' objects out of all
of them
also enabling the build id cache for this would go against the
purpose why I'd like to have this.. so hopefuly the numbers
will be convincing ;-)
jirka
On Fri, Nov 13, 2020 at 8:09 PM Jiri Olsa <[email protected]> wrote:
>
> On Fri, Nov 13, 2020 at 01:40:00PM +0900, Namhyung Kim wrote:
> > On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > > Adding --buildid-mmap option to enable build id in mmap2 events.
> > > It will only work if there's kernel support for that and it disables
> > > build id cache (implies --no-buildid).
> > >
> > > It's also possible to enable it permanently via config option
> > > in ~.perfconfig file:
> > >
> > > [record]
> > > build-id=mmap
> >
> > You also need to update the documentation.
>
> right, forgot doc for the config option
>
> SNIP
>
> > > "append timestamp to output filename"),
> > > OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
> > > @@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
> > >
> > > }
> > >
> > > + if (rec->buildid_mmap) {
> > > + if (!perf_can_record_build_id()) {
> > > + pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
> > > + err = -EINVAL;
> > > + goto out_opts;
> > > + }
> > > + pr_debug("Enabling build id in mmap2 events.\n");
> > > + /* Enable mmap build id synthesizing. */
> > > + symbol_conf.buildid_mmap2 = true;
> > > + /* Enable perf_event_attr::build_id bit. */
> > > + rec->opts.build_id = true;
> > > + /* Disable build id cache. */
> > > + rec->no_buildid = true;
> >
> > I'm afraid this can make it miss some build-id in the end because of
> > the possibility of the failure.
>
> with following fix (already merged):
> b33164f2bd1c bpf: Iterate through all PT_NOTE sections when looking for build id
>
> I could see high rate of build id being retrieved
>
> I'll make new numbers for next version, but I think we can neglect
> the failure, considering that we pick only 'hit' objects out of all
> of them
>
> also enabling the build id cache for this would go against the
> purpose why I'd like to have this.. so hopefuly the numbers
> will be convincing ;-)
Yeah, I think it'd be ok for most cases but we cannot guarantee..
What about checking the dso list at the end of a record session
and check all of them having build-id? Then we can safely skip
the build-id collecting stage. Hmm.. but it won't work for the pipe.
Thanks,
Namhyung
On Sat, Nov 14, 2020 at 09:31:56AM +0900, Namhyung Kim wrote:
> On Fri, Nov 13, 2020 at 8:09 PM Jiri Olsa <[email protected]> wrote:
> >
> > On Fri, Nov 13, 2020 at 01:40:00PM +0900, Namhyung Kim wrote:
> > > On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > > > Adding --buildid-mmap option to enable build id in mmap2 events.
> > > > It will only work if there's kernel support for that and it disables
> > > > build id cache (implies --no-buildid).
> > > >
> > > > It's also possible to enable it permanently via config option
> > > > in ~.perfconfig file:
> > > >
> > > > [record]
> > > > build-id=mmap
> > >
> > > You also need to update the documentation.
> >
> > right, forgot doc for the config option
> >
> > SNIP
> >
> > > > "append timestamp to output filename"),
> > > > OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
> > > > @@ -2657,6 +2662,21 @@ int cmd_record(int argc, const char **argv)
> > > >
> > > > }
> > > >
> > > > + if (rec->buildid_mmap) {
> > > > + if (!perf_can_record_build_id()) {
> > > > + pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
> > > > + err = -EINVAL;
> > > > + goto out_opts;
> > > > + }
> > > > + pr_debug("Enabling build id in mmap2 events.\n");
> > > > + /* Enable mmap build id synthesizing. */
> > > > + symbol_conf.buildid_mmap2 = true;
> > > > + /* Enable perf_event_attr::build_id bit. */
> > > > + rec->opts.build_id = true;
> > > > + /* Disable build id cache. */
> > > > + rec->no_buildid = true;
> > >
> > > I'm afraid this can make it miss some build-id in the end because of
> > > the possibility of the failure.
> >
> > with following fix (already merged):
> > b33164f2bd1c bpf: Iterate through all PT_NOTE sections when looking for build id
> >
> > I could see high rate of build id being retrieved
> >
> > I'll make new numbers for next version, but I think we can neglect
> > the failure, considering that we pick only 'hit' objects out of all
> > of them
> >
> > also enabling the build id cache for this would go against the
> > purpose why I'd like to have this.. so hopefuly the numbers
> > will be convincing ;-)
>
> Yeah, I think it'd be ok for most cases but we cannot guarantee..
> What about checking the dso list at the end of a record session
> and check all of them having build-id? Then we can safely skip
> the build-id collecting stage. Hmm.. but it won't work for the pipe.
how about inject command that would add missing buildids
to mmap2 events
jirka