linux-kernel - Re: [PATCH 6/9] kstaled: rate limit pages scanned per second.

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Message-Id: <20110928171309.b45c684f.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 28 Sep 2011 17:13:09 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Balbir Singh <bsingharora@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michael Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 6/9] kstaled: rate limit pages scanned per second.

On Tue, 27 Sep 2011 17:49:04 -0700
Michel Lespinasse <walken@...gle.com> wrote:

> Scan some number of pages from each node every second, instead of trying to
> scan the entime memory at once and being idle for the rest of the configured
> interval.
> 
> In addition to spreading the CPU usage over the entire scanning interval,
> this also reduces the jitter between two consecutive scans of the same page.
> 
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

Does this scan thread need to be signle thread ?

Thanks,
-Kame


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