Messages in this thread Patch in this message | | | Date | Sun, 8 Jan 2012 23:24:38 -0800 | From | tip-bot for Namhyung Kim <> | Subject | [tip:perf/core] perf top: Add error message for EMFILE |
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Commit-ID: cdce445906852d90efdc773ca7ba460e6e41664d Gitweb: http://git.kernel.org/tip/cdce445906852d90efdc773ca7ba460e6e41664d Author: Namhyung Kim <namhyung@gmail.com> AuthorDate: Sun, 8 Jan 2012 02:25:27 +0900 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Sun, 8 Jan 2012 13:26:11 -0200
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> --- 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 "
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