linux-kernel - Re: missing madvise functionality

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Message-ID: <461290D5.3020200@redhat.com>
Date:	Tue, 03 Apr 2007 13:37:25 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Ulrich Drepper <drepper@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jakub Jelinek <jakub@...hat.com>
Subject: Re: missing madvise functionality

Ulrich Drepper wrote:
> Rik van Riel wrote:
>> I already started looking into implementing this.
>>
>> Basically:
>> [...]
> 
> Sounds good.  Except:
> 
> 
>> 1) on MADV_DONTNEED, mark pages clean, not accessed and move them
>>    to some "dontneed" LRU list.
> 
> LRU is likely the wrong answer.  The longer a page has not been reused
> the more likely it won't be.  So, the dontneed-list  should be a simple
> FIFO.

Well yes, it is.

If the page was accessed again, it will be moved to
the active list :)

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