Re: [PATCH 16/34] perf, x86: Support weight samples for PEBS

From: Peter Zijlstra
Date: Tue Oct 23 2012 - 09:15:44 EST

On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> When a weighted sample is requested, first try to report the TSX abort cost
> on Haswell. If that is not available report the memory latency. This
> allows profiling both by abort cost and by memory latencies.
> Memory latencies requires enabling a different PEBS mode (LL).
> When both address and weight is requested address wins.
> The LL mode only works for memory related PEBS events, so add a
> separate event constraint table for those.
> I only did this for Haswell for now, but it could be added
> for several other Intel CPUs too by just adding the right
> table for them.

This looks like it will interfere with Stephane's LL patches -- which
should be out any day now ;-)

Stephane, any comments on how we should deal with all that?
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