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

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Message-ID: <20140604222857.GB16855@tassilo.jf.intel.com>
Date:	Wed, 4 Jun 2014 15:28:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	jolsa@...hat.com, zheng.z.yan@...el.com,
	maria.n.dimakopoulou@...il.com
Subject: Re: [PATCH 0/9] perf/x86: implement HT counter corruption workaround

> 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.

-Andi

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