Commit cdce4459 authored Jan 08, 2012 by Namhyung Kim Committed by Arnaldo Carvalho de Melo Jan 08, 2012

perf top: Add error message for EMFILE

When a user tries to open so many events, perf_event_open syscall may
fail with EMFILE. Provide advise for that case.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1325957132-10600-3-git-send-email-namhyung@gmail.com


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

parent c30ab8aa

tools/perf/builtin-top.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -888,6 +888,10 @@ try_again:
		ui__warning("The %s event is not supported.\n",
		event_name(counter));
		goto out_err;
		} else if (err == EMFILE) {
		ui__warning("Too many events are opened.\n"
		"Try again after reducing the number of events\n");
		goto out_err;
		}

		ui__warning("The sys_perf_event_open() syscall "