From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756761Ab1CBKJL (ORCPT ); Wed, 2 Mar 2011 05:09:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47424 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756735Ab1CBKJI (ORCPT ); Wed, 2 Mar 2011 05:09:08 -0500 Date: Wed, 2 Mar 2011 18:12:53 +0800 From: Han Pingtian To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo Subject: Re: [BUG] perf failed on multi-cpus system with multi-events specified Message-ID: <20110302101253.GA12300@hpt.nay.redhat.com> Mail-Followup-To: Peter Zijlstra , linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo References: <20110302035821.GA5186@hpt.nay.redhat.com> <1299058716.2428.13473.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1299058716.2428.13473.camel@twins> User-Agent: Mutt/1.5.20 (2009-12-10) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 02, 2011 at 10:38:36AM +0100, Peter Zijlstra wrote: > On Wed, 2011-03-02 at 11:58 +0800, Han Pingtian wrote: > > Error: sys_perf_event_open() syscall returned with -1 (Too many open > > files). /bin/dmesg may provide additional information. > > Well, you tried to use 42 events (quick count), we need to open a fd for > each cpu for each event, which results in 1008 fds, which together with > some actual file handles might have tickled your fd limit. Got it. Thanks. -- Han Pingtian Quality Engineer hpt @ #kernel-qe Red Hat, Inc Freedom ... courage ... Commitment ... ACCOUNTABILITY