linux-kernel - Re: [TESTCASE] Clean pages clogging the VM

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Message-ID: <20100818212613.GA7366@localhost>
Date:	Thu, 19 Aug 2010 05:26:13 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Li Shaohua <shaohua.li@...el.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [TESTCASE] Clean pages clogging the VM

> Mapped file pages get two rounds on the LRU list, so once the VM
> starts scanning, it has to go through all of them twice and can only
> reclaim them on the second encounter.

This can be fixed gracefully based on Rik's refault-distance patch :)
With the distance info we can safely drop the use-once mapped file pages.

Thanks,
Fengguang
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