linux-kernel - Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense buffer

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Date:	Mon, 25 May 2009 03:41:24 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense
	buffer

On Mon, May 25, 2009 at 09:30:48AM +0200, Jens Axboe wrote:
> Fold the sense buffer into the command, thereby eliminating a slab
> allocation and free per command.

Might help to send it to linux-scsi to get people to review and apply it
:)

But that patch looks good to me, avoiding one allocation for each
command and simplifying the code.  I try to remember why these were
two slabs to start with but can't find any reason.

Btw, we might just want to declare the sense buffer directly as a sized
array in the scsi command as there really doesn't seem to be a reason
not to allocate it.

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