lkml.org 
[lkml]   [2012]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/5] perf stat: 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-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


\
 
 \ /
  Last update: 2012-01-29 09:59    [W:0.134 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site