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

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Date:	Fri, 7 Aug 2009 12:17:49 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"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: Metzger, Markus T
>Sent: Friday, August 07, 2009 12:58 PM
>To: Ingo Molnar
>Cc: Peter Zijlstra; 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
>
>
>
>>-----Original Message-----
>>From: Ingo Molnar [mailto:mingo@...e.hu]
>>Sent: Friday, August 07, 2009 12:36 PM
>>To: Metzger, Markus T
>>Cc: Peter Zijlstra; 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
>>
>>
>>this simple test still locks up on latest -tip (which has your
>>latest patch):
>>
>>  titan:~> perf record -f -e branches -c 1 ./loop_1b_instructions
>>
>>on a Core2Duo CPU.
>
>This time, I can't reproduce the problem. I'm running three "perf record" of simple endless
>loop programs in parallel since several minutes on my a-few-days-old -tip plus my patch.


Ingo, what exactly do you mean by "locks up"? Is the kernel hanging or is perf record hanging?

What I'm seeing is that perf record hangs when I try to ^C it. It tries to collect the rest of
the branch trace but trace is generated so fast that it never completes.

regards,
markus.

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