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

Andi Kleen
2012-10-29T10:13:30Z

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@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?

No. It's still 2

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

-Andi

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