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authorNamhyung Kim <namhyung@gmail.com>2012-01-08 02:25:27 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-01-08 13:26:11 -0200
commitcdce445906852d90efdc773ca7ba460e6e41664d (patch)
treeb09c6c99908c573f4c72cf1c30e5078eb0413c96 /tools
parentc30ab8aa084843159b4679e9a3d7f63187d5906a (diff)
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')
-rw-r--r--tools/perf/builtin-top.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index d89dec90103..8f80df89603 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 "