linux-kernel - Re: [Xen-devel] Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux

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Message-ID: <4A5A4AF2.40609@redhat.com>
Date:	Sun, 12 Jul 2009 23:43:30 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	npiggin@...e.de, akpm@...l.org, xen-devel@...ts.xensource.com,
	tmem-devel@....oracle.com, kurt.hackel@...cle.com,
	Rusty Russell <rusty@...tcorp.com.au>, jeremy@...p.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	sunil.mushran@...cle.com, chris.mason@...cle.com,
	Anthony Liguori <anthony@...emonkey.ws>,
	Schwidefsky <schwidefsky@...ibm.com>, dave.mccracken@...cle.com,
	Marcelo Tosatti <mtosatti@...hat.com>,
	alan@...rguk.ukuu.org.uk, Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [Xen-devel] Re: [RFC PATCH 0/4] (Take 2): transcendent memory
 ("tmem") for Linux

On 07/12/2009 11:39 PM, Dan Magenheimer wrote:
>> Right, the transient uses of tmem when applied to disk objects
>> (swap/pagecache) are very similar to disk caches.  Which is
>> why you can
>> get a very similar effect when caching your virtual disks;
>> this can be
>> done without any guest modification.
>>      
>
> Write-through backing and virtual disk cacheing offer a
> similar effect, but it is far from the same.
>    

Can you explain how it differs for the swap case?  Maybe I don't 
understand how tmem preswap works.

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

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