From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753988Ab2AHPma (ORCPT ); Sun, 8 Jan 2012 10:42:30 -0500 Received: from casper.infradead.org ([85.118.1.10]:59572 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753691Ab2AHPm3 (ORCPT ); Sun, 8 Jan 2012 10:42:29 -0500 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Namhyung Kim , Paul Mackerras , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 3/9] perf top: Add error message for EMFILE Date: Sun, 8 Jan 2012 13:42:13 -0200 Message-Id: <1326037339-31125-4-git-send-email-acme@infradead.org> X-Mailer: git-send-email 1.7.8.GIT In-Reply-To: <1326037339-31125-1-git-send-email-acme@infradead.org> References: <1326037339-31125-1-git-send-email-acme@infradead.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.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: Namhyung Kim When a user tries to open so many events, perf_event_open syscall may fail with EMFILE. Provide advise for that case. Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1325957132-10600-3-git-send-email-namhyung@gmail.com Signed-off-by: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo --- 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 d89dec9..8f80df8 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -888,6 +888,10 @@ 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 " -- 1.7.8.GIT