linux-kernel - RE: [patch] x86, perf_counter, bts: add bts to perf

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77EC1B964FD@irsmsx504.ger.corp.intel.com>
Date:	Wed, 5 Aug 2009 12:10:26 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [patch] x86, perf_counter, bts: add bts to perf_counter

>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu]
>Sent: Tuesday, August 04, 2009 1:36 PM
>To: Peter Zijlstra
>Cc: Metzger, Markus T; tglx@...utronix.de; hpa@...or.com; markus.t.metzger@...il.com; linux-
>kernel@...r.kernel.org
>Subject: Re: [patch] x86, perf_counter, bts: add bts to perf_counter
>
>
>* Ingo Molnar <mingo@...e.hu> wrote:
>
>> > Over all looks very nice, some comments below (could be
>> > addressed in a delta patch).
>>
>> ok - thanks guys - i'll test this some and push it out into the
>> perfcounters tree. Will apply the delta patch too once it's done.
>
>the kernel hard-locks if i try to use it:
>
> titan:~/tip/tools/perf> perf record -f -e branches -c 1 ~/hackbench 1
>
>with the attached 64-bit (def-)config, on a Core2 test-box, latest
>-tip.

I can reproduce the problem when tracing kernel branches.

When I trace user-branches or when I disable overflow handling, it seems to work OK.

Please drop the patch. I'll resend the entire patch after I fixed that problem.

thanks and regards,
markus.

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