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Date: Tue, 07 Jul 2009 13:28:13 -0400
From: Rik van Riel <riel@...hat.com>
To: Dan Magenheimer <dan.magenheimer@...cle.com>
CC: linux-kernel@...r.kernel.org, npiggin@...e.de, akpm@...l.org,
jeremy@...p.org, xen-devel@...ts.xensource.com,
tmem-devel@....oracle.com, alan@...rguk.ukuu.org.uk,
linux-mm@...ck.org, kurt.hackel@...cle.com,
Rusty Russell <rusty@...tcorp.com.au>,
dave.mccracken@...cle.com, Marcelo Tosatti <mtosatti@...hat.com>,
sunil.mushran@...cle.com, Avi Kivity <avi@...hat.com>,
Schwidefsky <schwidefsky@...ibm.com>, chris.mason@...cle.com,
Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux
Dan Magenheimer wrote:
> "Preswap" IS persistent, but for various reasons may not always be
> available for use, again due to factors that may not be visible to the
> kernel (but, briefly, if the kernel is being "good" and has shared its
> resources nicely, then it will be able to use preswap, else it will not).
> Once a page is put, a get on the page will always succeed.
What happens when all of the free memory on a system
has been consumed by preswap by a few guests?
Will the system be unable to start another guest,
or is there some way to free the preswap memory?
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