linux-kernel - Re: perf: multiplexing broken on amd fam16h?

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Message-ID: <20150722141036.GT25159@twins.programming.kicks-ass.net>
Date:	Wed, 22 Jul 2015 16:10:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: multiplexing broken on amd fam16h?

On Tue, Jul 21, 2015 at 02:14:54PM -0400, Vince Weaver wrote:
> If I run the perf_event_tests check_multiplexing test it fails like this:

FWIW, that contains:

   /* we have to close, because PERF_EVENT_IOC_RESET */
   /* does not clear multiplexing informatio.        */

Do you need that? We could add another reset ioctl with a flags argument
on what all to clear.
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