linux-kernel - Re: [PATCH 6/7] wipe_page_reference return SWAP_AGAIN if VM pressulre is low and lock contention is detected.

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Message-ID: <4B1C1BB8.9080301@redhat.com>
Date:	Sun, 06 Dec 2009 16:01:44 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>
Subject: Re: [PATCH 6/7] wipe_page_reference return SWAP_AGAIN if VM pressulre
 is low and lock contention is detected.

On 12/04/2009 03:45 AM, KOSAKI Motohiro wrote:
>  From 3fb2a585729a37e205c5ea42ac6c48d4a6c0a29c Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Date: Fri, 4 Dec 2009 12:54:37 +0900
> Subject: [PATCH 6/7] wipe_page_reference return SWAP_AGAIN if VM pressulre is low and lock contention is detected.
>
> Larry Woodman reported AIM7 makes serious ptelock and anon_vma_lock
> contention on current VM. because SplitLRU VM (since 2.6.28) remove
> calc_reclaim_mapped() test, then shrink_active_list() always call
> page_referenced() against mapped page although VM pressure is low.
> Lightweight VM pressure is very common situation and it easily makes
> ptelock contention with page fault. then, anon_vma_lock is holding
> long time and it makes another lock contention. then, fork/exit
> throughput decrease a lot.

It looks good to me.   Larry, does this patch series resolve
your issue?

Acked-by: Rik van Riel <riel@...hat.com>

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