linux-kernel - Re: [PATCH] mm: vmscan: handle isolated pages with lru lock released

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Message-Id: <20120116092745.7721ff31.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 16 Jan 2012 09:27:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-mm@...ck.org, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: vmscan: handle isolated pages with lru lock
 released

On Sat, 14 Jan 2012 20:05:11 +0800
Hillf Danton <dhillf@...il.com> wrote:

> On Fri, Jan 13, 2012 at 11:00 PM, Hillf Danton <dhillf@...il.com> wrote:

> ===cut here===
> From: Hillf Danton <dhillf@...il.com>
> Subject: [PATCH] mm: vmscan: handle isolated pages with lru lock released
> 
> When shrinking inactive lru list, isolated pages are queued on locally private
> list, so the lock-hold time could be reduced if pages are counted without lock
> protection. To achive that, firstly updating reclaim stat is delayed until the
> putback stage, which is pointed out by Hugh, after reacquiring the lru lock.
> 
> Secondly operations related to vm and zone stats, are now proteced with
> preemption disabled as they are per-cpu operation.
> 
> Thanks for comments and ideas received.
> 
> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>

Nice.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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