linux-kernel - Re: [PATCH 14/14] fs,xfs: Allow kswapd to writeback pages

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Message-Id: <20100702153143.44c5fec8.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 2 Jul 2010 15:31:43 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>, Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 14/14] fs,xfs: Allow kswapd to writeback pages

On Fri, 2 Jul 2010 15:26:43 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > I see the direction you are thinking of but I have big concerns about clean
> > pages getting delayed for too long on the LRU_CLEANING pages before kswapd
> > puts them back in the right place. I think a safer direction would be for
> > memcg people to investigate Andrea's "switch stack" suggestion.
> > 
> Hmm, I may have to consider that. My concern is that IRQ's switch-stack works
> well just because no-task-switch in IRQ routine. (I'm sorry if I misunderstand.)
> 
Ok, I'll think about this 1st.

Thanks,
-Kame

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