| From | Namhyung Kim <> | Subject | Re: [PATCH 01/33] perf, x86: Add PEBSv2 record support | Date | Mon, 29 Oct 2012 19:08:04 +0900 |
| |
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
|