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

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Message-ID: <CABPqkBSwrnfgVVFxHdVxU5ytzVoBrn+YipXX6uY5F4YG3zcqMw@mail.gmail.com>
Date:	Fri, 22 May 2015 06:29:47 -0700
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] perf/x86: Improve HT workaround GP counter constraint

On Fri, May 22, 2015 at 6:25 AM, Peter Zijlstra <peterz@...radead.org> 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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