Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 3/5] perf stat: Add error message for EMFILE | Date | Sun, 29 Jan 2012 17:55:54 +0900 |
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When a user tries to open so many events, perf_event_oen syscall may fail with EMFILE. Provide an advice for that case.
Signed-off-by: Namhyung Kim <namhyung@gmail.com> --- tools/perf/builtin-stat.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 459b8620a5d9..f74f9a557c9a 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -477,6 +477,9 @@ static int run_perf_stat(int argc __used, const char **argv) "\t Consider tweaking" " /proc/sys/kernel/perf_event_paranoid or running as root.", system_wide ? "system-wide " : ""); + } else if (errno == EMFILE) { + error("Too many events are opened.\n" + "\t Try again after reducing the number of events.\n"); } else { error("open_counter returned with %d (%s). " "/bin/dmesg may provide additional information.\n", -- 1.7.8.2
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