Re: [PATCH 4/5] perf, x86: Add INST_RETIRED.ALL workarounds

[Peter Zijlstra]

On Mon, Aug 25, 2014 at 03:43:30PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> On Broadwell INST_RETIRED.ALL cannot be used with any period
> that doesn't have the lowest 6 bits cleared. And the period
> should not be smaller than 128.
> 
> Add a new callback to enforce this, and set it for Broadwell.
> 
> This is erratum BDM57 and BDM11.

This changelog could do with more words on the solution, esp. such that
you answer Stephanes question.
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