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Date: Wed, 12 Aug 2009 17:54:56 +0200
Message-ID: <7c86c4470908120854h2868695dka07ce55377bd262a@mail.gmail.com>
Subject: Re: [PATCH 0/2] perf_counter: fix the group mess
From: stephane eranian <eranian@googlemail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
       Corey J Ashford <cjashfor@us.ibm.com>,
       LKML <linux-kernel@vger.kernel.org>
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On Wed, Aug 12, 2009 at 5:35 PM, Peter Zijlstra<a.p.zijlstra@chello.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");