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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