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

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Message-ID: <20090804111412.GA20942@elte.hu>
Date:	Tue, 4 Aug 2009 13:14:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Markus Metzger <markus.t.metzger@...el.com>, 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


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Tue, 2009-07-21 at 15:56 +0200, Markus Metzger wrote:
> > Implement a performance counter with:
> >     attr.type           = PERF_TYPE_HARDWARE
> >     attr.config         = PERF_COUNT_HW_BRANCH_INSTRUCTIONS
> >     attr.sample_period  = 1
> > 
> > using branch trace store (BTS) on x86 hardware, if available.
> > 
> > The from and to address for each branch can be sampled using:
> >     PERF_SAMPLE_IP      for the from address
> >     PERF_SAMPLE_ADDR    for the to address
> > 
> 
> 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.

Thanks,

	Ingo
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