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

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Message-ID: <1299058716.2428.13473.camel@twins>
Date:	Wed, 02 Mar 2011 10:38:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Han Pingtian <phan@...hat.com>
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, 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.

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