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Date: Mon, 21 Jan 2002 00:49:27 +0300
From: Hans Reiser <reiser@namesys.com>
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To: Rik van Riel <riel@conectiva.com.br>
CC: Shawn <spstarr@sh0n.net>, linux-kernel@vger.kernel.org,
        Josh MacDonald <jmacd@CS.Berkeley.EDU>
Subject: Re: Possible Idea with filesystem buffering.
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Rik van Riel wrote:

>On Mon, 21 Jan 2002, Hans Reiser wrote:
>
>>>>and should otherwise check to see if the filesystem supports something
>>>>like pressure_fs_cache(), yes?
>>>>
>>>That's incompatible with the concept of memory zones.
>>>
>>Care to explain more?
>>
>
>On basically any machine we'll have multiple memory zones.
>
>Each of those memory zones has its own free list and each
>of the zones can get low on free pages independantly of the
>other zones.
>
>This means that if the VM asks to get a particular page
>freed, at the very minimum you need to make a page from the
>same zone freeable.
>
>regards,
>
>Rik
>

I'll discuss with Josh tomorrow how we might implement support for that. 
  A clean and simple mechanism does not come to my mind immediately.

Hans

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