Re: [PATCH v2 02/11] perf/x86: Improve HT workaround GP counter constraint

[Stephane Eranian]

On Wed, May 27, 2015 at 3:13 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Wed, May 27, 2015 at 02:01:04AM -0700, Stephane Eranian wrote:
>> >  #define PERF_X86_EVENT_AUTO_RELOAD     0x0400 /* use PEBS auto-reload */
>> >  #define PERF_X86_EVENT_FREERUNNING     0x0800 /* use freerunning PEBS */
>> >
>> What's free running PEBS? ;->
>
> The series here:
>
>   http://lkml.kernel.org/r/1430940834-8964-2-git-send-email-kan.liang@xxxxxxxxx

Ok, I assume this goes with more patches that enable depth > 1 for the
PEBS buffer, otherwise
I am not so sure about the added value. PEBS micro-code has to
reprogram that MSR
no matter what, hasn't it?
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