From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753488AbbE1AKs (ORCPT ); Wed, 27 May 2015 20:10:48 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:33909 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752184AbbE1AKp (ORCPT ); Wed, 27 May 2015 20:10:45 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Jiri Olsa , David Ahern , Michael Petlan , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 5/7] perf tools: Add hint for 'Too many events are opened.' error message Date: Wed, 27 May 2015 21:05:32 -0300 Message-Id: <1432771534-1312-6-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1432771534-1312-1-git-send-email-acme@kernel.org> References: <1432771534-1312-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jiri Olsa Enhancing the 'Too many events are opened.' error message with hint to use use 'ulimit -n ' command. Before: $ perf record -e 'sched:*,syscalls:*' ls Error: Too many events are opened. Try again after reducing the number of events. Now: $ perf record -e 'sched:*,syscalls:*' ls Error: Too many events are opened. Probably the maximum number of open file descriptors has been reached. Hint: Try again after reducing the number of events. Hint: Try increasing the limit with 'ulimit -n ' Signed-off-by: Jiri Olsa Cc: David Ahern Cc: Michael Petlan Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1432587114-14924-1-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index c886b9f7a48d..a3e36fc634dc 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -2149,7 +2149,9 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, case EMFILE: return scnprintf(msg, size, "%s", "Too many events are opened.\n" - "Try again after reducing the number of events."); + "Probably the maximum number of open file descriptors has been reached.\n" + "Hint: Try again after reducing the number of events.\n" + "Hint: Try increasing the limit with 'ulimit -n '"); case ENODEV: if (target->cpu_list) return scnprintf(msg, size, "%s", -- 2.1.0