linux-kernel - Re: block cache replacement strategy?

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Message-ID: <AANLkTikoUAgRV18axesaiYnpBWe2V-xhALgh7dtF7p3Y@mail.gmail.com>
Date:	Tue, 14 Sep 2010 05:09:31 +1000
From:	dave b <db.pub.mail@...il.com>
To:	Johannes Stezenbach <js@...21.net>
Cc:	Florian Mickler <florian@...kler.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: block cache replacement strategy?

On 14 September 2010 01:21, Johannes Stezenbach <js@...21.net> wrote:
> On Fri, Sep 10, 2010 at 06:02:48PM +0200, Johannes Stezenbach wrote:
>>
>> Linear read heuristic might be a good guess, but it would
>> be nice to hear a comment from a vm/fs expert which
>> confirms this works as intended.
>
> Apparently I'm unworthy to get a response from someone knowledgable :-(
>
> Anyway I found lmdd (from lmbench) can do random reads,
> and indeed causes the data to enter the block (page?) cache,
> replacing the previous data.


I am no expert, but what did you think would happen if you did dd
twice from /dev/zero?
but... Honestly what do you think will be cached?
If you want 'COW', use btrfs.

--
Conscience doth make cowards of us all.		-- Shakespeare
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