linux-ext4 - Re: [PATCH v2 2/2] block: share request flush fields with elevator

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Message-ID: <20110203092401.GA2570@htj.dyndns.org>
Date:	Thu, 3 Feb 2011 10:24:01 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>, tytso@....edu, djwong@...ibm.com,
	shli@...nel.org, neilb@...e.de, adilger.kernel@...ger.ca,
	jack@...e.cz, linux-kernel@...r.kernel.org, kmannth@...ibm.com,
	cmm@...ibm.com, linux-ext4@...r.kernel.org, rwheeler@...hat.com,
	hch@....de, josef@...hat.com, jmoyer@...hat.com, vgoyal@...hat.com
Subject: Re: [PATCH v2 2/2] block: share request flush fields with
 elevator_private

On Tue, Feb 01, 2011 at 05:46:13PM -0500, Mike Snitzer wrote:
> Flush requests are never put on the IO scheduler.  Convert request
> structure's elevator_private* into an array and have the flush fields
> share a union with it.
> 
> Reclaim the space lost in 'struct request' by moving 'completion_data'
> back in the union with 'rb_node'.
> 
> Signed-off-by: Mike Snitzer <snitzer@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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