linux-kernel - Re: [RFC] high system time & lock contention running large mixed workload

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Date:	Thu, 03 Dec 2009 19:29:33 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Larry Woodman <lwoodman@...hat.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC] high system time & lock contention running large mixed
 workload

On 12/03/2009 05:14 PM, Larry Woodman wrote:

> The attached patch addresses this issue by changing page_check_address()
> to return -1 if the spin_trylock() fails and page_referenced_one() to
> return 1 in that path so the page gets moved back to the active list.

Your patch forgot to add the code to vmscan.c to actually move
the page back to the active list.

Also, please use an enum for the page_referenced return
values, so the code in vmscan.c can use symbolic names.

enum page_reference {
	NOT_REFERENCED,
	REFERENCED,
	LOCK_CONTENDED,
};

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