linux-kernel - Re: mmotm 2011-04-29 - wonky VmRSS and VmHWM values after swapping

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Message-ID: <3313.1305162521@localhost>
Date:	Wed, 11 May 2011 21:08:41 -0400
From:	Valdis.Kletnieks@...edu
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: mmotm 2011-04-29 - wonky VmRSS and VmHWM values after swapping

On Tue, 10 May 2011 18:04:45 +0200, Peter Zijlstra said:

> I haven't quite figured out how to reproduce, but does the below cure
> things? If so, it should probably be folded into the first patch
> (mm-mmu_gather-rework.patch?) since that is the one introducing this.
> 
> ---
> Subject: mm: Fix RSS zap_pte_range() accounting
> 
> Since we update the RSS counters when breaking out of the loop and
> release the PTE lock, we should start with fresh deltas when we
> restart the gather loop.

Confirming this patch makes the numbers look sane and plausible again, so
feel free to stick a Tested-By: to match the Reported-By:.

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