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    Subject[PATCH 3/9] perf top: Add error message for EMFILE
    Date
    From: Namhyung Kim <namhyung@gmail.com>

    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>
    ---
    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 d89dec9..8f80df8 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 "
    --
    1.7.8.GIT


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