From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754070Ab2AHPz7 (ORCPT ); Sun, 8 Jan 2012 10:55:59 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:39552 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753985Ab2AHPzg (ORCPT ); Sun, 8 Jan 2012 10:55:36 -0500 From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Paul Mackerras , Ingo Molnar , linux-kernel@vger.kernel.org Subject: [PATCH 3/3] perf stat: Add error message for EMFILE Date: Mon, 9 Jan 2012 00:55:25 +0900 Message-Id: <1326038125-2929-3-git-send-email-namhyung@gmail.com> X-Mailer: git-send-email 1.7.8.2 In-Reply-To: <1326038125-2929-1-git-send-email-namhyung@gmail.com> References: <1326038125-2929-1-git-send-email-namhyung@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 f5d2a63eba66..3e6c8dd8417f 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