Re: [RFC PATCH 5/7] perf, x86: use the PEBS auto reload mechanism when possible

[Peter Zijlstra]

On Wed, May 28, 2014 at 02:18:08PM +0800, Yan, Zheng wrote:
> When a fixed period is specified, this patch make perf use the PEBS
> auto reload mechanism. This makes normal profiling faster, because
> it avoids one costly MSR write in the PMI handler.
> 

You can't do this unconditionally. Like I think you mention in the next
patch, we need the PMI to fix up lots of cases.

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