linux-kernel - Re: [PATCH 06/14] perf, x86: PEBS infrastructure

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Message-ID: <20100305061942.GF27606@brick.ozlabs.ibm.com>
Date:	Fri, 5 Mar 2010 17:19:42 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, eranian@...gle.com,
	robert.richter@....com, fweisbec@...il.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH 06/14] perf, x86: PEBS infrastructure

On Thu, Mar 04, 2010 at 03:00:52PM +0100, Peter Zijlstra wrote:

> Implement a simple PEBS model that always takes a single PEBS event at
> a time. This is done so that the interaction with the rest of the
> system is as expected (freq adjust, period randomization, lbr).
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> LKML-Reference: <new-submission>
> ---

...

> @@ -203,8 +203,9 @@ struct perf_event_attr {
>  				enable_on_exec :  1, /* next exec enables     */
>  				task           :  1, /* trace fork/exit       */
>  				watermark      :  1, /* wakeup_watermark      */
> +				precise        :  1, /* OoO invariant counter */

Could you explain in a bit more detail what this means?  

Also, it would be good to mention the ABI addition in the patch
description, and explain it briefly there.

Paul.
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