From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752408Ab2A2I4o (ORCPT ); Sun, 29 Jan 2012 03:56:44 -0500 Received: from mail-pw0-f46.google.com ([209.85.160.46]:59349 "EHLO mail-pw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752163Ab2A2I4I (ORCPT ); Sun, 29 Jan 2012 03:56:08 -0500 From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Paul Mackerras , Ingo Molnar , linux-kernel@vger.kernel.org Subject: [PATCH 3/5] perf stat: Add error message for EMFILE Date: Sun, 29 Jan 2012 17:55:54 +0900 Message-Id: <1327827356-8786-3-git-send-email-namhyung@gmail.com> X-Mailer: git-send-email 1.7.8.2 In-Reply-To: <1327827356-8786-1-git-send-email-namhyung@gmail.com> References: <1327827356-8786-1-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 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