From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
mingo@kernel.org, vincent.weaver@maine.edu, eranian@google.com,
jolsa@redhat.com, kan.liang@intel.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 02/11] perf/x86: Improve HT workaround GP counter constraint
Date: Wed, 27 May 2015 16:00:52 +0200 [thread overview]
Message-ID: <20150527140051.GS19417@two.firstfloor.org> (raw)
In-Reply-To: <20150527074809.GU3644@twins.programming.kicks-ass.net>
On Wed, May 27, 2015 at 09:48:09AM +0200, Peter Zijlstra wrote:
> On Tue, May 26, 2015 at 04:33:42PM -0700, Andi Kleen wrote:
> > Peter Zijlstra <peterz@infradead.org> writes:
> > > + */
> > > + if (is_ht_workaround_enabled() && !cpuc->is_fake &&
> >
> > Could this function also check if at least one leaking event is
> > scheduled somewhere? (e.g. from a global count)
>
> You truncated one line too many:
>
> + if (is_ht_workaround_enabled() && !cpuc->is_fake &&
> + READ_ONCE(cpuc->excl_cntrs->exclusive_present))
> + gpmax /= 2;
>
> Guess what that READ_ONCE() does? It checks if there's one such leaky
> event on the current core.
Great. Thanks.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2015-05-27 14:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-22 13:29 [PATCH v2 00/11] Various x86 pmu scheduling patches Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 01/11] perf,x86: Fix event/group validation Peter Zijlstra
2015-05-22 13:40 ` Peter Zijlstra
2015-05-26 9:24 ` Stephane Eranian
2015-05-26 10:12 ` Peter Zijlstra
2015-05-26 11:46 ` Stephane Eranian
2015-05-26 12:16 ` Peter Zijlstra
2015-05-26 12:25 ` Stephane Eranian
2015-05-26 13:22 ` Peter Zijlstra
2015-05-26 13:44 ` Stephane Eranian
2015-05-22 13:29 ` [PATCH v2 02/11] perf/x86: Improve HT workaround GP counter constraint Peter Zijlstra
2015-05-22 13:42 ` Peter Zijlstra
2015-05-26 9:37 ` Stephane Eranian
2015-05-26 10:15 ` Peter Zijlstra
2015-05-26 11:47 ` Stephane Eranian
2015-05-26 13:19 ` Peter Zijlstra
2015-05-26 16:07 ` Peter Zijlstra
2015-05-27 9:01 ` Stephane Eranian
2015-05-27 10:11 ` Peter Zijlstra
2015-05-27 11:39 ` Stephane Eranian
2015-05-27 10:13 ` Peter Zijlstra
2015-05-27 11:44 ` Stephane Eranian
2015-05-26 23:33 ` Andi Kleen
2015-05-27 7:48 ` Peter Zijlstra
2015-05-27 14:00 ` Andi Kleen [this message]
2015-05-22 13:29 ` [PATCH v2 03/11] perf/x86: Correct local vs remote sibling state Peter Zijlstra
2015-05-26 11:48 ` Stephane Eranian
2015-05-22 13:29 ` [PATCH v2 04/11] perf/x86: Use lockdep Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 05/11] perf/x86: Simplify dynamic constraint code somewhat Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 06/11] perf/x86: Make WARNs consistent Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 07/11] perf/x86: Move intel_commit_scheduling() Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 08/11] perf/x86: Remove pointless tests Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 09/11] perf/x86: Remove intel_excl_states::init_state Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 10/11] perf,x86: Simplify logic Peter Zijlstra
2015-05-22 13:29 ` [PATCH v2 11/11] perf/x86: Simplify put_exclusive_constraints Peter Zijlstra
2015-05-22 13:38 ` Peter Zijlstra
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