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Subject[PATCH 2/3] perf record: Add error message for EMFILE
Date
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-record.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0abfb18b911f..d47b8277ca78 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -248,6 +248,10 @@ 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");
+ exit(EXIT_FAILURE);
}

printf("\n");
--
1.7.8.2


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