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| author | Namhyung Kim <namhyung@gmail.com> | 2012-01-07 18:25:27 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-01-08 16:26:11 +0100 |
| commit | cdce445906852d90efdc773ca7ba460e6e41664d (patch) | |
| tree | b09c6c99908c573f4c72cf1c30e5078eb0413c96 /tools/perf/builtin-top.c | |
| parent | perf test: Change type of '-v' option to INCR (diff) | |
| download | linux-cdce445906852d90efdc773ca7ba460e6e41664d.tar.xz linux-cdce445906852d90efdc773ca7ba460e6e41664d.zip | |
perf top: Add error message for EMFILE
When a user tries to open so many events, perf_event_open syscall may
fail with EMFILE. Provide advise for that case.
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1325957132-10600-3-git-send-email-namhyung@gmail.com
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-top.c')
| -rw-r--r-- | tools/perf/builtin-top.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index d89dec90103e..8f80df896038 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -888,6 +888,10 @@ try_again: ui__warning("The %s event is not supported.\n", event_name(counter)); goto out_err; + } else if (err == EMFILE) { + ui__warning("Too many events are opened.\n" + "Try again after reducing the number of events\n"); + goto out_err; } ui__warning("The sys_perf_event_open() syscall " |