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

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Message-ID: <20090503154216.GU8822@parisc-linux.org>
Date:	Sun, 3 May 2009 09:42:16 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeff Garzik <jgarzik@...hat.com>, linux-scsi@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Mark Lord <lkml@....ca>
Subject: Re: New TRIM/UNMAP tree published (2009-05-02)

On Sun, May 03, 2009 at 06:02:51PM +0300, Boaz Harrosh wrote:
> I agree with Hugh. The allocation is done at, too-low in the food chain.
> (And that free of buffer at upper layer allocated by lower layer).
> 
> I think you need to separate the: "does lld need buffer, what size"
> from the "here is buffer prepare", so upper layer that can sleep does
> sleep.

So you want two function pointers in the request queue relating to discard?

> In all other buffer needing operations the allocation is done before
> submission of request, No?

It's not true for the flush request (the example I quoted).  Obviously,
the solution adopted here by IDE is Bad and Wrong ...

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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