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Date:	Wed, 27 May 2015 21:13:13 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	peterz@...radead.org
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, jolsa@...hat.com,
	eranian@...gle.com
Subject: 

[Repost; I forgot to copy linux-kernel earlier. Apologies if you
see it twice.]

Skylake moved to 32 Last Branch Records, from previously 16. 
The current call stack LBR implementation reads all LBRs and
also saves/restores them on context switch. This patchkit
adds some optimizations to avoid extra costs in most cases
from the larger number of LBRs for call-stack, unless a nesting
larger than 16 is actually needed. It applies on top of the
earlier Skylake code. Some of the optimization will also benefit
earlier CPUs, such as Haswell.

note: one patch is for perf user space, the rest is kernel.

-Andi

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