A perf uncore PMU may have two PMU names, a real name and an alias name.
With this patch set, the perf tool can monitor the PMU with either the
real name or the alias.
Use the real name,
$ perf stat -e uncore_cha_2/event=1/ -x,
4044879584,,uncore_cha_2/event=1/,2528059205,100.00,,
Use the alias,
$ perf stat -e uncore_type_0_2/event=1/ -x,
3659675336,,uncore_type_0_2/event=1/,2287306455,100.00,,
v6:
---
1. Call setup_pmu_alias_list in pmu_find_alias_name.
2. Check pmu->name and pmu->alias_name after strdup in pmu_lookup.
v5:
---
1. Don't use strdup in find functions (pmu_find_real_name and
pmu_find_alias_name). Just return name and keep the
'pmu->name = strdup(name);' in pmu_lookup.
2. Remove invalid comment for alias_name in struct perf_pmu.
v4:
---
1. Fix memory leaks in pmu_lookup.
2. Rebase to perf/core.
v3:
---
1. Use fgets() to replace fscanf().
2. Resource cleanup.
v2:
---
Add test case to verify the real name and alias name having same effect.
Jin Yao (1):
perf tests: Test for PMU alias
Kan Liang (1):
perf pmu: Add PMU alias support
tools/perf/arch/x86/util/pmu.c | 139 +++++++++++++++++++++++++++++++-
tools/perf/tests/parse-events.c | 92 +++++++++++++++++++++
tools/perf/util/parse-events.y | 3 +-
tools/perf/util/pmu.c | 40 ++++++++-
tools/perf/util/pmu.h | 5 ++
5 files changed, 274 insertions(+), 5 deletions(-)
--
2.17.1
A perf uncore PMU may have two PMU names, a real name and an alias
name. Add one test case to verify the real name and alias name having
the same effect.
Iterate the sysfs to get one event which has an alias and create
evlist by adding two evsels. Evsel1 is created by event and evsel2
is created by alias.
Test asserts:
evsel1->core.attr.type == evsel2->core.attr.type
evsel1->core.attr.config == evsel2->core.attr.config
Signed-off-by: Jin Yao <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
---
v6:
- No change.
v5:
- No change.
v4:
- Rebase to perf/core.
v3:
- Use fgets to read alias string from sysfs.
- Resource cleanup.
v2:
- New in v2.
tools/perf/tests/parse-events.c | 92 +++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 8d4866739255..fd3556cc9ad4 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -9,6 +9,7 @@
#include "pmu-hybrid.h"
#include <dirent.h>
#include <errno.h>
+#include "fncache.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -2194,9 +2195,91 @@ static int test_pmu_events(void)
return ret;
}
+static bool test_alias(char **event, char **alias)
+{
+ char path[PATH_MAX];
+ DIR *dir;
+ struct dirent *dent;
+ const char *sysfs = sysfs__mountpoint();
+ char buf[128];
+ FILE *file;
+
+ if (!sysfs)
+ return false;
+
+ snprintf(path, PATH_MAX, "%s/bus/event_source/devices/", sysfs);
+ dir = opendir(path);
+ if (!dir)
+ return false;
+
+ while ((dent = readdir(dir))) {
+ if (!strcmp(dent->d_name, ".") ||
+ !strcmp(dent->d_name, ".."))
+ continue;
+
+ snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/alias",
+ sysfs, dent->d_name);
+
+ if (!file_available(path))
+ continue;
+
+ file = fopen(path, "r");
+ if (!file)
+ continue;
+
+ if (!fgets(buf, sizeof(buf), file)) {
+ fclose(file);
+ continue;
+ }
+
+ /* Remove the last '\n' */
+ buf[strlen(buf) - 1] = 0;
+
+ fclose(file);
+ *event = strdup(dent->d_name);
+ *alias = strdup(buf);
+ closedir(dir);
+
+ if (*event == NULL || *alias == NULL) {
+ free(*event);
+ free(*alias);
+ return false;
+ }
+
+ return true;
+ }
+
+ closedir(dir);
+ return false;
+}
+
+static int test__checkevent_pmu_events_alias(struct evlist *evlist)
+{
+ struct evsel *evsel1 = evlist__first(evlist);
+ struct evsel *evsel2 = evlist__last(evlist);
+
+ TEST_ASSERT_VAL("wrong type", evsel1->core.attr.type == evsel2->core.attr.type);
+ TEST_ASSERT_VAL("wrong config", evsel1->core.attr.config == evsel2->core.attr.config);
+ return 0;
+}
+
+static int test_pmu_events_alias(char *event, char *alias)
+{
+ struct evlist_test e = { .id = 0, };
+ char name[2 * NAME_MAX + 20];
+
+ snprintf(name, sizeof(name), "%s/event=1/,%s/event=1/",
+ event, alias);
+
+ e.name = name;
+ e.check = test__checkevent_pmu_events_alias;
+ return test_event(&e);
+}
+
int test__parse_events(struct test *test __maybe_unused, int subtest __maybe_unused)
{
int ret1, ret2 = 0;
+ char *event, *alias;
#define TEST_EVENTS(tests) \
do { \
@@ -2221,6 +2304,15 @@ do { \
return ret;
}
+ if (test_alias(&event, &alias)) {
+ int ret = test_pmu_events_alias(event, alias);
+
+ free(event);
+ free(alias);
+ if (ret)
+ return ret;
+ }
+
ret1 = test_terms(test__terms, ARRAY_SIZE(test__terms));
if (!ret2)
ret2 = ret1;
--
2.17.1
From: Kan Liang <[email protected]>
A perf uncore PMU may have two PMU names, a real name and an alias. The
alias is exported at /sys/bus/event_source/devices/uncore_*/alias.
The perf tool should support the alias as well.
Add alias_name in the struct perf_pmu to store the alias. For the PMU
which doesn't have an alias. It's NULL.
Introduce two X86 specific functions to retrieve the real name and the
alias separately.
Only go through the sysfs to retrieve the mapping between the real name
and the alias once. The result is cached in a list, uncore_pmu_list.
Nothing changed for the other ARCHs.
With the patch, the perf tool can monitor the PMU with either the real
name or the alias.
Use the real name,
$ perf stat -e uncore_cha_2/event=1/ -x,
4044879584,,uncore_cha_2/event=1/,2528059205,100.00,,
Use the alias,
$ perf stat -e uncore_type_0_2/event=1/ -x,
3659675336,,uncore_type_0_2/event=1/,2287306455,100.00,,
Co-developed-by: Jin Yao <[email protected]>
Signed-off-by: Jin Yao <[email protected]>
Signed-off-by: Kan Liang <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
---
v6:
- Call setup_pmu_alias_list in pmu_find_alias_name.
- Check pmu->name and pmu->alias_name after strdup in pmu_lookup.
v5:
- Don't use strdup in pmu_find_real_name and pmu_find_alias_name.
Just return name and keep the 'pmu->name = strdup(name);' in
pmu_lookup.
- Remove invalid comment for alias_name in struct perf_pmu.
v4:
- Fix memory leaks in pmu_lookup.
- Rebase to perf/core.
v3:
- Use fgets to read alias string from sysfs.
- Resource cleanup.
v2:
- No change.
tools/perf/arch/x86/util/pmu.c | 139 ++++++++++++++++++++++++++++++++-
tools/perf/util/parse-events.y | 3 +-
tools/perf/util/pmu.c | 40 +++++++++-
tools/perf/util/pmu.h | 5 ++
4 files changed, 182 insertions(+), 5 deletions(-)
diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
index d48d608517fd..e5a8938dc829 100644
--- a/tools/perf/arch/x86/util/pmu.c
+++ b/tools/perf/arch/x86/util/pmu.c
@@ -1,12 +1,30 @@
// SPDX-License-Identifier: GPL-2.0
#include <string.h>
-
+#include <stdio.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <fcntl.h>
#include <linux/stddef.h>
#include <linux/perf_event.h>
+#include <linux/zalloc.h>
+#include <api/fs/fs.h>
+#include <errno.h>
#include "../../../util/intel-pt.h"
#include "../../../util/intel-bts.h"
#include "../../../util/pmu.h"
+#include "../../../util/fncache.h"
+
+#define TEMPLATE_ALIAS "%s/bus/event_source/devices/%s/alias"
+
+struct perf_pmu_alias_name {
+ char *name;
+ char *alias;
+ struct list_head list;
+};
+
+static LIST_HEAD(pmu_alias_name_list);
+static bool cached_list;
struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
{
@@ -18,3 +36,122 @@ struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu __mayb
#endif
return NULL;
}
+
+static int setup_pmu_alias_list(void)
+{
+ char path[PATH_MAX];
+ DIR *dir;
+ struct dirent *dent;
+ const char *sysfs = sysfs__mountpoint();
+ struct perf_pmu_alias_name *pmu;
+ char buf[MAX_PMU_NAME_LEN];
+ FILE *file;
+ int ret = 0;
+
+ if (!sysfs)
+ return -1;
+
+ snprintf(path, PATH_MAX,
+ "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
+
+ dir = opendir(path);
+ if (!dir)
+ return -1;
+
+ while ((dent = readdir(dir))) {
+ if (!strcmp(dent->d_name, ".") ||
+ !strcmp(dent->d_name, ".."))
+ continue;
+
+ snprintf(path, PATH_MAX,
+ TEMPLATE_ALIAS, sysfs, dent->d_name);
+
+ if (!file_available(path))
+ continue;
+
+ file = fopen(path, "r");
+ if (!file)
+ continue;
+
+ if (!fgets(buf, sizeof(buf), file)) {
+ fclose(file);
+ continue;
+ }
+
+ fclose(file);
+
+ pmu = zalloc(sizeof(*pmu));
+ if (!pmu) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ /* Remove the last '\n' */
+ buf[strlen(buf) - 1] = 0;
+
+ pmu->alias = strdup(buf);
+ if (!pmu->alias)
+ goto mem_err;
+
+ pmu->name = strdup(dent->d_name);
+ if (!pmu->name)
+ goto mem_err;
+
+ list_add_tail(&pmu->list, &pmu_alias_name_list);
+ continue;
+mem_err:
+ ret = -ENOMEM;
+ free(pmu->alias);
+ free(pmu->name);
+ free(pmu);
+ break;
+ }
+
+ closedir(dir);
+ return ret;
+}
+
+static char *__pmu_find_real_name(const char *name)
+{
+ struct perf_pmu_alias_name *pmu;
+
+ list_for_each_entry(pmu, &pmu_alias_name_list, list) {
+ if (!strcmp(name, pmu->alias))
+ return pmu->name;
+ }
+
+ return (char *)name;
+}
+
+char *pmu_find_real_name(const char *name)
+{
+ if (cached_list)
+ return __pmu_find_real_name(name);
+
+ setup_pmu_alias_list();
+ cached_list = true;
+
+ return __pmu_find_real_name(name);
+}
+
+static char *__pmu_find_alias_name(const char *name)
+{
+ struct perf_pmu_alias_name *pmu;
+
+ list_for_each_entry(pmu, &pmu_alias_name_list, list) {
+ if (!strcmp(name, pmu->name))
+ return pmu->alias;
+ }
+ return NULL;
+}
+
+char *pmu_find_alias_name(const char *name)
+{
+ if (cached_list)
+ return __pmu_find_alias_name(name);
+
+ setup_pmu_alias_list();
+ cached_list = true;
+
+ return __pmu_find_alias_name(name);
+}
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 9321bd0e2f76..d94e48e1ff9b 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -316,7 +316,8 @@ event_pmu_name opt_pmu_config
if (!strncmp(name, "uncore_", 7) &&
strncmp($1, "uncore_", 7))
name += 7;
- if (!perf_pmu__match(pattern, name, $1)) {
+ if (!perf_pmu__match(pattern, name, $1) ||
+ !perf_pmu__match(pattern, pmu->alias_name, $1)) {
if (parse_events_copy_term_list(orig_terms, &terms))
CLEANUP_YYABORT;
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true, false))
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 6cdbee8a12e7..1a35915edf68 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -945,6 +945,18 @@ perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
return NULL;
}
+char * __weak
+pmu_find_real_name(const char *name)
+{
+ return (char *)name;
+}
+
+char * __weak
+pmu_find_alias_name(const char *name __maybe_unused)
+{
+ return NULL;
+}
+
static int pmu_max_precise(const char *name)
{
char path[PATH_MAX];
@@ -958,13 +970,15 @@ static int pmu_max_precise(const char *name)
return max_precise;
}
-static struct perf_pmu *pmu_lookup(const char *name)
+static struct perf_pmu *pmu_lookup(const char *lookup_name)
{
struct perf_pmu *pmu;
LIST_HEAD(format);
LIST_HEAD(aliases);
__u32 type;
+ char *name = pmu_find_real_name(lookup_name);
bool is_hybrid = perf_pmu__hybrid_mounted(name);
+ char *alias_name;
/*
* Check pmu name for hybrid and the pmu may be invalid in sysfs
@@ -995,6 +1009,16 @@ static struct perf_pmu *pmu_lookup(const char *name)
pmu->cpus = pmu_cpumask(name);
pmu->name = strdup(name);
+ if (!pmu->name)
+ goto err;
+
+ alias_name = pmu_find_alias_name(name);
+ if (alias_name) {
+ pmu->alias_name = strdup(alias_name);
+ if (!pmu->alias_name)
+ goto err;
+ }
+
pmu->type = type;
pmu->is_uncore = pmu_is_uncore(name);
if (pmu->is_uncore)
@@ -1017,15 +1041,22 @@ static struct perf_pmu *pmu_lookup(const char *name)
pmu->default_config = perf_pmu__get_default_config(pmu);
return pmu;
+err:
+ if (pmu->name)
+ free(pmu->name);
+ free(pmu);
+ return NULL;
}
static struct perf_pmu *pmu_find(const char *name)
{
struct perf_pmu *pmu;
- list_for_each_entry(pmu, &pmus, list)
- if (!strcmp(pmu->name, name))
+ list_for_each_entry(pmu, &pmus, list) {
+ if (!strcmp(pmu->name, name) ||
+ (pmu->alias_name && !strcmp(pmu->alias_name, name)))
return pmu;
+ }
return NULL;
}
@@ -1919,6 +1950,9 @@ bool perf_pmu__has_hybrid(void)
int perf_pmu__match(char *pattern, char *name, char *tok)
{
+ if (!name)
+ return -1;
+
if (fnmatch(pattern, name, 0))
return -1;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 033e8211c025..6b122f97acf3 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -21,6 +21,7 @@ enum {
#define PERF_PMU_FORMAT_BITS 64
#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
+#define MAX_PMU_NAME_LEN 128
struct perf_event_attr;
@@ -32,6 +33,7 @@ struct perf_pmu_caps {
struct perf_pmu {
char *name;
+ char *alias_name;
char *id;
__u32 type;
bool selectable;
@@ -136,4 +138,7 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
bool perf_pmu__has_hybrid(void);
int perf_pmu__match(char *pattern, char *name, char *tok);
+char *pmu_find_real_name(const char *name);
+char *pmu_find_alias_name(const char *name);
+
#endif /* __PMU_H */
--
2.17.1