linux-kernel - Re: [PATCH 00/10] Various x86 pmu scheduling patches

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Message-ID: <20150521125312.GN3644@twins.programming.kicks-ass.net>
Date:	Thu, 21 May 2015 14:53:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
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 00/10] Various x86 pmu scheduling patches

On Thu, May 21, 2015 at 04:48:16AM -0700, Stephane Eranian wrote:
> Peter,
> 
> On Thu, May 21, 2015 at 4:17 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > Unless I messed things up again, patch 1 and 2 are for perf/urgent and the rest
> > can wait.
> >
> > I would still like to relax the HT scheduling constraint in case there are no
> > funny events at all, but I've not yet found a nice way to do that.
> >
> Are you talking about the HT bug workaround? If there is no
> corrupting event across HT threads, then scheduling is not impacted.

It is, commit c02cdbf60b51 ("perf/x86/intel: Limit to half counters when
the HT workaround is enabled, to avoid exclusive mode starvation") is
active irrespective of any active events.
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