linux-kernel - Re: [PATCH 0/2] perf_counter: fix the group mess

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Date:	Wed, 12 Aug 2009 17:54:56 +0200
From:	stephane eranian <eranian@...glemail.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey J Ashford <cjashfor@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] perf_counter: fix the group mess

On Wed, Aug 12, 2009 at 5:35 PM, Peter Zijlstra<a.p.zijlstra@...llo.nl> wrote:
>
> With these two patches the below proglet gives:
>
> # ./test
> EVNT: 0xffffffff811c0f4c scale: nan ID: 37 CNT: 1006180 ID: 38 CNT: 1010230 ID: 39 CNT: 1010332 ID: 40 CNT: 1010420
>
> I can't seem to catch the SIGIO thing, but at least all the counters report

I think it's because you are missing this fcntl() call to get async
notification:

       ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_ASYNC);
        if (ret == -1)
                err(1, "cannot set ASYNC");
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