Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH v2 2/2] perf: Add error message for EMFILE | Date | Tue, 31 Jan 2012 10:15:16 +0900 |
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When a user tries to open so many event on multiple tasks/cpus, perf_event_open syscall may fail with EMFILE. Provide an advice for that case.
Signed-off-by: Namhyung Kim <namhyung.kim@lge.com> Cc: David Ahern <dsahern@gmail.com> --- tools/perf/builtin-record.c | 5 +++++ tools/perf/builtin-stat.c | 4 ++++ tools/perf/builtin-top.c | 3 ++- 3 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 32870eef952f..a334008a1853 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -249,6 +249,11 @@ try_again: ui__warning("The %s event is not supported.\n", event_name(pos)); exit(EXIT_FAILURE); + } else if (err == EMFILE) { + ui__warning("Too many events are opened.\n" + "Try again after reducing the number of events,\n" + "tasks and/or cpus.\n"); + exit(EXIT_FAILURE); } printf("\n"); diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 459b8620a5d9..7c5421c7af06 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -477,6 +477,10 @@ 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" + "\t tasks and/or cpus."); } else { error("open_counter returned with %d (%s). " "/bin/dmesg may provide additional information.\n", diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index e8b033c074f9..987af3695218 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -899,7 +899,8 @@ try_again: goto out_err; } else if (err == EMFILE) { ui__warning("Too many events are opened.\n" - "Try again after reducing the number of events\n"); + "Try again after reducing the number of events,\n" + "tasks and/or cpus.\n"); goto out_err; } -- 1.7.9.rc1.dirty
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