linux-ext4 - Re: [PATCH, RFC 0/3] Introduce new O_HOT and O

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Date:	Sat, 21 Apr 2012 14:26:43 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Lukas Czerner <lczerner@...hat.com>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Theodore Ts'o <tytso@....edu>, linux-fsdevel@...r.kernel.org,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH, RFC 0/3] Introduce new O_HOT and O_COLD flags

On 04/20/2012 07:01 AM, James Bottomley wrote:
> The concern I have is that the notion of hot and cold files *isn't*
> propagated to the page cache, it's just shared between the fs and the
> disk.

Bingo -- full-file hint is too coarse-grained for some workloads.  Page 
granularity would propagate to the VM as well as block layer, and give 
the required flexibility to all workloads.  As well as covering the 
full-file case.

	Jeff


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