Re: [PATCH 02/10] perf/x86: Improve HT workaround GP counter constraint

[Stephane Eranian]

On Fri, May 22, 2015 at 6:25 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Fri, May 22, 2015 at 06:07:00AM -0700, Stephane Eranian wrote:
>>
>> One other thing I noticed is that the --n_excl needs to be protected by the
>> excl_cntrs->lock in put_excl_constraints().
>
> Nah, its strictly per cpu.

No. the excl_cntrs struct is pointed to by cpuc but it is shared between the
sibling HT. Otherwise this would not work!
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