linux-kernel - Re: [PATCH 64 of 66] scale nr_rotated to balance memory pressure

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Message-ID: <20101118191540.GG30376@random.random>
Date:	Thu, 18 Nov 2010 20:15:40 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 64 of 66] scale nr_rotated to balance memory pressure

On Tue, Nov 09, 2010 at 03:16:21PM +0900, KOSAKI Motohiro wrote:
> I haven't seen this patch series carefully yet. So, probably
> my question is dumb. Why don't we need to change ->recent_scanned[] too?

That one is taken care by the prev patch where it is increased by 512
through nr_taken (after the previous patch the isolation methods now
return in 4k units). What was left to update was the nr_rotated++
which is why this patch isn't touching the recent_scanned.

Andrea
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