From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752834Ab2AGRZy (ORCPT ); Sat, 7 Jan 2012 12:25:54 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:41981 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752737Ab2AGRZo (ORCPT ); Sat, 7 Jan 2012 12:25:44 -0500 From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Ingo Molnar , Paul Mackerras , linux-kernel@vger.kernel.org Subject: [PATCH 3/8] perf top: Add error message for EMFILE Date: Sun, 8 Jan 2012 02:25:27 +0900 Message-Id: <1325957132-10600-3-git-send-email-namhyung@gmail.com> X-Mailer: git-send-email 1.7.6 In-Reply-To: <1325957132-10600-1-git-send-email-namhyung@gmail.com> References: <1325957132-10600-1-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_open syscall may fail with EMFILE. Provide advise for that case. Signed-off-by: Namhyung Kim --- tools/perf/builtin-top.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 4f81eeb99875..ad18dd37e87d 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -889,6 +889,10 @@ 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 " -- 1.7.6