Re: [PATCH 0/9] perf/x86: implement HT counter corruption workaround

Stephane Eranian
2014-06-05T12:45:32Z

On Thu, Jun 5, 2014 at 12:28 AM, Andi Kleen <ak@linux.intel.com> wrote:
>> There is no HW or FW workaround for this problem.
>
> Actually there is for global measurements:
>
> measure with Any bit set and divide by two.
>
> Please add a check that the any bit is set, and disable
> the workaround for that case.
>
I think this assume same event is measured on sibling counters at any time.
Otherwise, how does that eliminate the corruption?