linux-kernel - [PATCH 2/5] perf record: Add error message for EMFILE

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Date:	Sun, 29 Jan 2012 17:55:53 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] perf record: Add error message for EMFILE

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@...il.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 32870eef952f..5d3b6794d93b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -249,6 +249,10 @@ 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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