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

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux
From: Avi Kivity <avi@xxxxxxxxxx>
Date: Sun, 12 Jul 2009 23:43:30 +0300
Cc: npiggin@xxxxxxx, akpm@xxxxxxxx, jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, tmem-devel@xxxxxxxxxxxxxx, kurt.hackel@xxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, dave.mccracken@xxxxxxxxxx, linux-mm@xxxxxxxxx, sunil.mushran@xxxxxxxxxx, alan@xxxxxxxxxxxxxxxxxxx, Anthony Liguori <anthony@xxxxxxxxxxxxx>, Schwidefsky <schwidefsky@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, chris.mason@xxxxxxxxxx, Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
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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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