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

Namhyung Kim
2012-10-29T10:08:09Z

Hi Andi,

On Fri, 26 Oct 2012 13:29:43 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.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?

Thanks,
Namhyung