linux-kernel - Re: [BUG] perf failed on multi-cpus system with multi-events specified

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Message-ID: <20110302101253.GA12300@hpt.nay.redhat.com>
Date:	Wed, 2 Mar 2011 18:12:53 +0800
From:	Han Pingtian <phan@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [BUG] perf failed on multi-cpus system with multi-events
 specified

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
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