[tip:perf/core] perf augmented_syscalls: Filter on a hard coded pid

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  55f127b43143363d000165c7cb72e4b95de1380d
Gitweb:     https://git.kernel.org/tip/55f127b43143363d000165c7cb72e4b95de1380d
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 6 Nov 2018 15:23:40 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 21 Nov 2018 12:00:31 -0300

perf augmented_syscalls: Filter on a hard coded pid

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@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-oshrcgcekiyhd0whwisxfvtv@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/examples/bpf/augmented_raw_syscalls.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index 90a19336310b..2feb00018f79 100644
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -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);