linux-kernel - [tip:perf/urgent] perf test BPF: Fixup BPF test using epoll

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Date:   Sat, 21 Apr 2018 00:53:53 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, dsahern@...il.com, mingo@...nel.org,
        namhyung@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, adrian.hunter@...el.com,
        linux@...inikbrodowski.net, rostedt@...dmis.org, acme@...hat.com,
        wangnan0@...wei.com
Subject: [tip:perf/urgent] perf test BPF: Fixup BPF test using epoll_pwait
 syscall function probe

Commit-ID:  eccb1b936363c62544bccb5bbb75afec9536f7e3
Gitweb:     https://git.kernel.org/tip/eccb1b936363c62544bccb5bbb75afec9536f7e3
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 18 Apr 2018 12:59:03 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 18 Apr 2018 15:35:53 -0300

perf test BPF: Fixup BPF test using epoll_pwait syscall function probe

Since e145242ea0df ("syscalls/core, syscalls/x86: Clean up syscall stub
naming convention") changed the main syscall function for 'epoll_pwait'
to something other than the expected 'SyS_epoll_pwait the' 'perf test
BPF' entries started failing, fix it by using something called from the
main syscall function instead, 'epoll_wait', which should keep this test
working in older kernels too.

Before:

  # perf test BPF
  40: BPF filter                           :
  40.1: Basic BPF filtering                : FAILED!
  40.2: BPF pinning                        : Skip
  40.3: BPF prologue generation            : Skip
  40.4: BPF relocation checker             : Skip

If we use -v for that test we see the problem:

    Probe point 'SyS_epoll_pwait' not found.

After:

  # perf test BPF
  40: BPF filter                           :
  40.1: Basic BPF filtering                : Ok
  40.2: BPF pinning                        : Ok
  40.3: BPF prologue generation            : Ok
  40.4: BPF relocation checker             : Ok
  #

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Dominik Brodowski <linux@...inikbrodowski.net>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: https://lkml.kernel.org/r/tip-y24nmn70cs2am8jh4i344dng@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/bpf-script-example.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/bpf-script-example.c b/tools/perf/tests/bpf-script-example.c
index e4123c1b0e88..1ca5106df5f1 100644
--- a/tools/perf/tests/bpf-script-example.c
+++ b/tools/perf/tests/bpf-script-example.c
@@ -31,7 +31,7 @@ struct bpf_map_def SEC("maps") flip_table = {
 	.max_entries = 1,
 };
 
-SEC("func=SyS_epoll_pwait")
+SEC("func=do_epoll_wait")
 int bpf_func__SyS_epoll_pwait(void *ctx)
 {
 	int ind =0;