linux-kernel - Re: New TRIM/UNMAP tree published (2009-05-02)

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Message-ID: <49FF0987.8040608@panasas.com>
Date:	Mon, 04 May 2009 18:28:07 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matthew Wilcox <matthew@....cx>,
	Jens Axboe <jens.axboe@...cle.com>,
	Hugh Dickins <hugh@...itas.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Mark Lord <lkml@....ca>
Subject: Re: New TRIM/UNMAP tree published (2009-05-02)

On 05/04/2009 01:47 AM, Jeff Garzik wrote:
> James Bottomley wrote:
>> The ideal for REQ_TYPE_DISCARD seems to be to force a page allocation
>> tied to a bio when it's issued at the top.  That way everyone has enough
>> memory when it comes down the stack (both extents and WRITE SAME sector
>> will fit into a page ... although only just for WRITE SAME on 4k
>> sectors).
> 
> Makes sense...
> 
> 	Jeff
> 

I second that, let the allocator of the request supply a buffer and free it
on return/done. Perhaps with a general helper that does all that.

Boaz
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