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Date:	Tue, 24 Apr 2012 11:07:57 -0500
From:	Alex Elder <>
To:	Theodore Ts'o <>
	Ext4 Developers List <>
Subject: Re: [PATCH, RFC 0/3] Introduce new O_HOT and O_COLD flags

On 04/19/2012 02:20 PM, Theodore Ts'o wrote:
> As I had brought up during one of the lightning talks at the Linux
> Storage and Filesystem workshop, I am interested in introducing two new
> open flags, O_HOT and O_COLD.  These flags are passed down to the
> individual file system's inode operations' create function, and the file
> system can use these flags as a hint regarding whether the file is
> likely to be accessed frequently or not.
> In the future I plan to do further work on how ext4 would use these
> flags, but I want to first get the ability to pass these flags plumbed
> into the VFS layer and the code points for O_HOT and O_COLD reserved.

Consider this:  Is this a testable feature?

You're proposing a hint, of course, so it could just have no effect.
But let's just assume for the sake of discussion that it has been

How will I (filesystem implementer) know whether I have implemented
it correctly?

How can the user verify that the use of these flags is producing
the expected result?

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