linux-ext4 - Re: [RFC] fadvise: add more flags to provide a hint for block allocation

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Date:	Tue, 6 Mar 2012 21:30:55 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Sunil Mushran <sunil.mushran@...cle.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [RFC] fadvise: add more flags to provide a hint for block
 allocation

On Mon, Mar 05, 2012 at 08:26:03PM -0800, Sunil Mushran wrote:
> On 3/5/2012 6:35 PM, Zheng Liu wrote:
> >No, _RANDOM means that file system doesn't need to try its best to find
> >a proper position to allocate some blocks for this file.  Furthermore,
> >currently random IOs seem that they are not obviously slower than
> >sequential IOs in Flash/SSD device.  For example, when users know a file
> >that is accessed infrequently, they can put this file in a corner, such
> >as in some discontinuously blocks.  Then sequential blocks are reserved
> >for the file that needs to be accessed frequently and users can obtain
> >the better performance.
> 
> Then FADV_ALLOC_HOT_REGION and FADV_ALLOC_COLD_REGION are
> probably better terms.

Make sense to me. Thanks a lot. ;-)

Regards,
Zheng

> 
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