From mboxrd@z Thu Jan  1 00:00:00 1970
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim
Date: Tue,  6 Jul 2010 09:36:41 +0900 (JST)
Message-ID: <20100706093529.CCD1.A69D9226@jp.fujitsu.com>
References: <20100702125155.69c02f85.akpm@linux-foundation.org> <20100705134949.GC13780@csn.ul.ie>
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Cc: kosaki.motohiro@jp.fujitsu.com, Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-mm@kvack.org, Dave Chinner <david@fromorbit.com>,
        Chris Mason <chris.mason@oracle.com>, Nick Piggin <npiggin@suse.de>,
        Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Christoph Hellwig <hch@infradead.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Andrea Arcangeli <aarcange@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
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In-Reply-To: <20100705134949.GC13780@csn.ul.ie>
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Hello,

> Ok, that's reasonable as I'm still working on that patch. For example, the
> patch disabled anonymous page writeback which is unnecessary as the stack
> usage for anon writeback is less than file writeback. 

How do we examine swap-on-file?

> Second, using systemtap,
> I was able to see that file-backed dirty pages have a tendency to be near the
> end of the LRU even though they are a small percentage of the overall pages
> in the LRU. I'm hoping to figure out why this is as it would make avoiding
> writeback a lot less controversial.




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