linux-kernel - Re: [PATCH 01/33] perf, x86: Add PEBSv2 record support

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Date:	Mon, 29 Oct 2012 11:13:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	acme@...hat.com, peterz@...radead.org, jolsa@...hat.com,
	eranian@...gle.com, mingo@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 01/33] perf, x86: Add PEBSv2 record support

On Mon, Oct 29, 2012 at 07:08:04PM +0900, Namhyung Kim wrote:
> Hi Andi,
> 
> On Fri, 26 Oct 2012 13:29:43 -0700, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> >
> > Add support for the v2 PEBS format. It has a superset of the v1 PEBS
> > fields, but has a longer record so we need to adjust the code paths.
> >
> > The main advantage is the new "EventingRip" support which directly
> > gives the instruction, not off-by-one instruction. So with precise == 2
> > we use that directly and don't try to use LBRs and walking basic blocks.
> > This lowers the overhead significantly.
> 
> That means it can support precise == 3?

No. It's still 2

I tried to introduced precise == 3 some time ago for PDIR, but it was
rejected. 

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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