linux-kernel - Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

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Date:	Thu, 29 Apr 2010 22:01:57 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jeremy@...p.org, hugh.dickins@...cali.co.uk,
	ngupta@...are.org, JBeulich@...ell.com, chris.mason@...cle.com,
	kurt.hackel@...cle.com, dave.mccracken@...cle.com, npiggin@...e.de,
	akpm@...ux-foundation.org, riel@...hat.com
Subject: Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

On 04/29/2010 09:59 PM, Avi Kivity wrote:
>
> I'm convinced it's useful.  The API is so close to a block device 
> (read/write with key/value vs read/write with sector/value) that we 
> should make the effort not to introduce a new API.
>

Plus of course the asynchronity and batching of the block layer.  Even 
if you don't use a dma engine, you improve performance by exiting one 
per several dozen pages instead of for every page, perhaps enough to 
allow the hypervisor to justify copying the memory with non-temporal moves.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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