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

[Paul Mackerras]

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@xxxxxxxxx>
> 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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