2021-03-08 08:44:47

by Tiezhu Yang

Subject: [PATCH] MIPS: Enable some missed configs in loongson3_defconfig to support bpftrace

bpftrace is a high-level tracing language for Linux enhanced Berkeley
Packet Filter (eBPF) available in recent Linux kernels (4.x). bpftrace
uses LLVM as a backend to compile scripts to BPF-bytecode and makes use
of BCC for interacting with the Linux BPF system, as well as existing
Linux tracing capabilities: kernel dynamic tracing (kprobes), user-level
dynamic tracing (uprobes), and tracepoints.

According to Linux Kernel Requirements in bpftrace/INSTALL.md [1], the
kernel needs to be built with the following options:

CONFIG_BPF=y
CONFIG_BPF_SYSCALL=y
CONFIG_BPF_JIT=y
CONFIG_HAVE_EBPF_JIT=y
CONFIG_BPF_EVENTS=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_FUNCTION_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_HAVE_KPROBES=y
CONFIG_KPROBES=y
CONFIG_KPROBE_EVENTS=y
CONFIG_ARCH_SUPPORTS_UPROBES=y
CONFIG_UPROBES=y
CONFIG_UPROBE_EVENTS=y
CONFIG_DEBUG_FS=y

So enable some missed configs in loongson3_defconfig to make sure
the above configs are set after make loongson3_defconfig.

[1] https://github.com/iovisor/bpftrace/blob/master/INSTALL.md

Signed-off-by: Tiezhu Yang <[email protected]>
---
arch/mips/configs/loongson3_defconfig | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/mips/configs/loongson3_defconfig b/arch/mips/configs/loongson3_defconfig
index 0e79f81..1b8f693 100644
--- a/arch/mips/configs/loongson3_defconfig
+++ b/arch/mips/configs/loongson3_defconfig
@@ -26,6 +26,7 @@ CONFIG_SCHED_AUTOGROUP=y
CONFIG_SYSFS_DEPRECATED=y
CONFIG_RELAY=y
CONFIG_BLK_DEV_INITRD=y
+CONFIG_BPF_SYSCALL=y
CONFIG_EMBEDDED=y
CONFIG_PERF_EVENTS=y
CONFIG_MACH_LOONGSON64=y
@@ -40,6 +41,7 @@ CONFIG_MIPS32_N32=y
CONFIG_VIRTUALIZATION=y
CONFIG_KVM=m
CONFIG_KVM_MIPS_VZ=y
+CONFIG_KPROBES=y
CONFIG_MODULES=y
CONFIG_MODULE_FORCE_LOAD=y
CONFIG_MODULE_UNLOAD=y
@@ -129,6 +131,7 @@ CONFIG_L2TP=m
CONFIG_BRIDGE=m
CONFIG_VSOCKETS=m
CONFIG_VIRTIO_VSOCKETS=m
+CONFIG_BPF_JIT=y
CONFIG_CFG80211=m
CONFIG_CFG80211_WEXT=y
CONFIG_MAC80211=m
@@ -405,8 +408,10 @@ CONFIG_CRYPTO_DEFLATE=m
CONFIG_PRINTK_TIME=y
CONFIG_STRIP_ASM_SYMS=y
CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_FS=y
# CONFIG_SCHED_DEBUG is not set
# CONFIG_DEBUG_PREEMPT is not set
-# CONFIG_FTRACE is not set
+CONFIG_FUNCTION_TRACER=y
+CONFIG_FTRACE_SYSCALLS=y
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="ieee754=relaxed"
--
2.1.0

2021-03-10 15:20:38

by Thomas Bogendoerfer

Subject: Re: [PATCH] MIPS: Enable some missed configs in loongson3_defconfig to support bpftrace

On Mon, Mar 08, 2021 at 02:48:18PM +0800, Tiezhu Yang wrote:
> bpftrace is a high-level tracing language for Linux enhanced Berkeley
> Packet Filter (eBPF) available in recent Linux kernels (4.x). bpftrace
> uses LLVM as a backend to compile scripts to BPF-bytecode and makes use
> of BCC for interacting with the Linux BPF system, as well as existing
> Linux tracing capabilities: kernel dynamic tracing (kprobes), user-level
> dynamic tracing (uprobes), and tracepoints.
>
> According to Linux Kernel Requirements in bpftrace/INSTALL.md [1], the
> kernel needs to be built with the following options:
>
> CONFIG_BPF=y
> CONFIG_BPF_SYSCALL=y
> CONFIG_BPF_JIT=y
> CONFIG_HAVE_EBPF_JIT=y
> CONFIG_BPF_EVENTS=y
> CONFIG_FTRACE_SYSCALLS=y
> CONFIG_FUNCTION_TRACER=y
> CONFIG_HAVE_DYNAMIC_FTRACE=y
> CONFIG_DYNAMIC_FTRACE=y
> CONFIG_HAVE_KPROBES=y
> CONFIG_KPROBES=y
> CONFIG_KPROBE_EVENTS=y
> CONFIG_ARCH_SUPPORTS_UPROBES=y
> CONFIG_UPROBES=y
> CONFIG_UPROBE_EVENTS=y
> CONFIG_DEBUG_FS=y
>
> So enable some missed configs in loongson3_defconfig to make sure
> the above configs are set after make loongson3_defconfig.
>
> [1] https://github.com/iovisor/bpftrace/blob/master/INSTALL.md
>
> Signed-off-by: Tiezhu Yang <[email protected]>
> ---
> arch/mips/configs/loongson3_defconfig | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)

applied to mips-next.

Thomas.

--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]