linux-kernel - [tip:perf/core] perf bpf examples: Convert etcsnoop to use bpf

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Message-ID: <tip-znhgz24p0daux2kay200ovc1@git.kernel.org>
Date:   Sat, 26 Jan 2019 02:12:47 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, wangnan0@...wei.com, adrian.hunter@...el.com,
        namhyung@...nel.org, tglx@...utronix.de, jolsa@...nel.org,
        lclaudio@...hat.com, acme@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf bpf examples: Convert etcsnoop to use
 bpf_map()

Commit-ID:  f52fdd64f6046ab121688155aebd66b52ce0077d
Gitweb:     https://git.kernel.org/tip/f52fdd64f6046ab121688155aebd66b52ce0077d
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 24 Jan 2019 15:48:05 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 25 Jan 2019 15:12:11 +0100

perf bpf examples: Convert etcsnoop to use bpf_map()

Making the code more compact, end result is the same:

  # trace -e /home/acme/git/perf/tools/perf/examples/bpf/etcsnoop.c
     0.000 (         ): sed/7385 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) ...
  2727.723 (         ): cat/7389 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) ...
  2728.543 (         ): cat/7389 openat(dfd: CWD, filename: "/etc/passwd")                          ...
  ^C

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: https://lkml.kernel.org/n/tip-znhgz24p0daux2kay200ovc1@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/examples/bpf/etcsnoop.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/perf/examples/bpf/etcsnoop.c b/tools/perf/examples/bpf/etcsnoop.c
index 550e69c2e8d1..e81b535346c0 100644
--- a/tools/perf/examples/bpf/etcsnoop.c
+++ b/tools/perf/examples/bpf/etcsnoop.c
@@ -21,12 +21,8 @@
 
 #include <stdio.h>
 
-struct bpf_map SEC("maps") __augmented_syscalls__ = {
-       .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
-       .key_size = sizeof(int),
-       .value_size = sizeof(u32),
-       .max_entries = __NR_CPUS__,
-};
+/* bpf-output associated map */
+bpf_map(__augmented_syscalls__, PERF_EVENT_ARRAY, int, u32, __NR_CPUS__);
 
 struct augmented_filename {
 	int	size;