linux-kernel - [tip:perf/urgent] perf jevents: Handle events including .c and .o

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Date:   Mon, 17 Oct 2016 07:52:57 -0700
From:   tip-bot for Wang Nan <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     lizefan@...wei.com, ak@...ux.intel.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, wangnan0@...wei.com,
        sukadev@...ux.vnet.ibm.com, acme@...hat.com, jolsa@...nel.org,
        tglx@...utronix.de, mingo@...nel.org
Subject: [tip:perf/urgent] perf jevents: Handle events including .c and .o

Commit-ID:  2d470b62fa24f8d0024e8d392d28814c287ee1f1
Gitweb:     http://git.kernel.org/tip/2d470b62fa24f8d0024e8d392d28814c287ee1f1
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Sat, 8 Oct 2016 04:16:25 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Oct 2016 11:24:18 -0300

perf jevents: Handle events including .c and .o

This patch helps with Sukadev's vendor event tree where such events can happen.

>>From Andi Kleen:
 Any event including a .c/.o/.bpf currently triggers BPF compilation or loading
 and then an error. This can happen for some Intel vendor events, which cannot
 be used.

This patch fixes this problem by forbidding BPF file patch containing '{', '}'
and ',', make sure flex consumes the leading '{', instead of matching it using
a BPF file path.

Tested result:

  $ perf stat -e '{unc_p_clockticks,unc_p_power_state_occupancy.cores_c0}' -a -I 1000
  invalid or unsupported event: '{unc_p_clockticks,unc_p_power_state_occupancy.cores_c0}'
  Run 'perf list' for a list of valid events
  (as expected, interperted as event)

  $ perf stat -e 'aaa.c' -a -I 1000
  ERROR: problems with path aaa.c: No such file or directory
  (as expected, interpreted as BPF source)

  $ perf stat -e 'aaa.ccc' -a -I 1000
  invalid or unsupported event: 'aaa.ccc'
  (as expected, interpreted as event)

  $ perf stat -e '{aaa.c}' -a -I 1000
  ERROR: problems with path aaa.c: No such file or directory
  event syntax error: '{aaa.c}'
  <SKIP>
  (as expected, interpreted as BPF source)

  $ perf stat -e '{cycles,aaa.c}' -a -I 1000
  ERROR: problems with path aaa.c: No such file or directory
  event syntax error: '{cycles,aaa.c}'
  (as expected, interpreted as BPF source)

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Reported-by: Andi Kleen <ak@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1475900185-37967-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/parse-events.l | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 9f43fda..660fca0 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -136,8 +136,8 @@ do {							\
 group		[^,{}/]*[{][^}]*[}][^,{}/]*
 event_pmu	[^,{}/]+[/][^/]*[/][^,{}/]*
 event		[^,{}/]+
-bpf_object	.*\.(o|bpf)
-bpf_source	.*\.c
+bpf_object	[^,{}]+\.(o|bpf)
+bpf_source	[^,{}]+\.c
 
 num_dec		[0-9]+
 num_hex		0x[a-fA-F0-9]+