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perf top: Add error message for EMFILE

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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>
This commit is contained in:
Namhyung Kim 2012-01-08 02:25:27 +09:00 committed by Arnaldo Carvalho de Melo
parent c30ab8aa08
commit cdce445906
1 changed files with 4 additions and 0 deletions
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4
tools/perf/builtin-top.c
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@ -888,6 +888,10 @@ try_again:
ui__warning("The %s event is not supported.\n", ui__warning("The %s event is not supported.\n",
event_name(counter)); event_name(counter));
goto out_err; 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 " ui__warning("The sys_perf_event_open() syscall "