perf augmented_syscalls: Filter on a hard coded pid (55f127b4) · Commits · 戴 / test

Just to show where we'll hook pid based filters, and what we use to obtain the current pid, using a BPF getpid() equivalent. Now we need to remove that hardcoded PID with a BPF hash map, so that we start by filtering 'perf trace's own PID, implement the --filter-pid functionality, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-oshrcgcekiyhd0whwisxfvtv@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/examples/bpf/augmented_raw_syscalls.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -15,6 +15,7 @@
		*/

		#include <stdio.h>
		#include <unistd.h>
		#include <linux/socket.h>

		/* bpf-output associated map */
		@@ -56,6 +57,9 @@ int sys_enter(struct syscall_enter_args *args)
		unsigned int len = sizeof(augmented_args);
		const void *filename_arg = NULL;

		if (getpid() == 2971)
		return 0;

		probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
		/*
		* Yonghong and Edward Cree sayz:
		@@ -125,7 +129,7 @@ int sys_enter(struct syscall_enter_args *args)
		SEC("raw_syscalls:sys_exit")
		int sys_exit(struct syscall_exit_args *args)
		{
		return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */
		return getpid() != 2971;
		}

		license(GPL);

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