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xen-devel
[Xen-devel] Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") f
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To: |
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux |
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From: |
Rik van Riel <riel@xxxxxxxxxx> |
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Date: |
Tue, 07 Jul 2009 13:28:13 -0400 |
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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, chris.mason@xxxxxxxxxx, sunil.mushran@xxxxxxxxxx, Avi Kivity <avi@xxxxxxxxxx>, Schwidefsky <schwidefsky@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, alan@xxxxxxxxxxxxxxxxxxx, Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> |
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Tue, 07 Jul 2009 10:29:55 -0700 |
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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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