linux-kernel - Re: [PATCH 2/2] mm: compaction: Minimise the time IRQs are disabled while isolating pages for migration

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Date:	Tue, 1 Mar 2011 08:42:09 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arthur Marsh <arthur.marsh@...ernode.on.net>,
	Clemens Ladisch <cladisch@...glemail.com>,
	Linux-MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm: compaction: Minimise the time IRQs are disabled
 while isolating pages for migration

On Mon, 28 Feb 2011 10:18:27 +0000
Mel Gorman <mel@....ul.ie> wrote:

> > BTW, can't we drop disable_irq() from all lru_lock related codes ?
> > 
> 
> I don't think so - at least not right now. Some LRU operations such as LRU
> pagevec draining are run from IPI which is running from an interrupt so
> minimally spin_lock_irq is necessary.
> 

pagevec draining is done by workqueue(schedule_on_each_cpu()). 
I think only racy case is just lru rotation after writeback.

Thanks,
-Kame

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