linux-kernel - Re: I.5 - Mmaped count

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Message-ID: <19008.9397.341851.966629@cargo.ozlabs.ibm.com>
Date:	Tue, 23 Jun 2009 10:41:25 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	eranian@...il.com
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>,
	Andi Kleen <andi@...stfloor.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>
Subject: Re: I.5 - Mmaped count

stephane eranian writes:

> I don't see where you clear that field on x86.
> Looks like it comes from hwc->idx. I suspect you need
> to do something in x86_pmu_disable() to be symmetrical
> with x86_pmu_enable().
> 
> I suspect something similar needs to be done on Power.

power_pmu_disable() already calls perf_counter_update_userpage,
so I think we're OK there.

Paul.
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