Commit 18ffdfe8 authored May 25, 2015 by Jiri Olsa Committed by Arnaldo Carvalho de Melo May 27, 2015

perf tools: Add hint for 'Too many events are opened.' error message



Enhancing the 'Too many events are opened.' error message with hint to
use use 'ulimit -n <limit>' command.

Before:

  $ perf record -e 'sched:*,syscalls:*' ls
  Error:
  Too many events are opened.
  Try again after reducing the number of events.

Now:

  $ perf record -e 'sched:*,syscalls:*' ls
  Error:
  Too many events are opened.
  Probably the maximum number of open file descriptors has been reached.
  Hint: Try again after reducing the number of events.
  Hint: Try increasing the limit with 'ulimit -n <limit>'

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1432587114-14924-1-git-send-email-jolsa@kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 84c2cafa

tools/perf/util/evsel.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -2149,7 +2149,9 @@ int perf_evsel__open_strerror(struct perf_evsel evsel, struct target target,
		case EMFILE:
		return scnprintf(msg, size, "%s",
		"Too many events are opened.\n"
		"Try again after reducing the number of events.");
		"Probably the maximum number of open file descriptors has been reached.\n"
		"Hint: Try again after reducing the number of events.\n"
		"Hint: Try increasing the limit with 'ulimit -n <limit>'");
		case ENODEV:
		if (target->cpu_list)
		return scnprintf(msg, size, "%s",