Re: [PATCH 08/19] perf c2c: Shared data analyser

From: Peter Zijlstra
Date: Mon Mar 03 2014 - 13:41:49 EST


On Mon, Mar 03, 2014 at 01:07:00PM -0500, Joe Mario wrote:
> If you only sample on the HITMs then you don't get the store misses.
> That means you'll not be able to detect who is simultaneously tugging
> on the same cache lines. That gives up much of the value of "perf
> c2c".

As long as you know which lines are hurting bringing in (loads) you can
often figure out who is doing the stores on them.

> As we developed this, we ended up settling on Ivy Bridge to get the
> behavior we wanted.

Wouldn't SNB also work?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/