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

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Date:	Mon, 25 May 2009 06:42:15 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com,
	akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com, linux-scsi@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense
	buffer

On Mon, May 25, 2009 at 01:33:42PM +0300, Boaz Harrosh wrote:
> 1. If we have a machine with few type of hosts active each with it's own
> cmnd_slab we end up with many more slabs then today. Even though at the
> end they all happen to be of the same size. (With the pool reserves it
> can get big also).

Note that this should be optional.  Device not having their own
per-command structure would continue using the global pools.  Those
that have their own per-command structures already have their own pools
anyway.

> Hosts specify an size_of_private_command at host template, which might include
> the common-scsi_cmnd + sense_buffer + private_cmnd + optional scsi_ptr +
> bidi_data_buffer + ...

That sounds fine, too. 

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