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Re: [Xen-devel] [PATCH][TOOLS] Reducing impact of domainsave/restore/dum

To: "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][TOOLS] Reducing impact of domainsave/restore/dump on Dom0
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Wed, 21 Feb 2007 10:34:14 +0000
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On 13/2/07 22:12, "Graham, Simon" <Simon.Graham@xxxxxxxxxxx> wrote:

> Reduce impact of saving/restoring/dumping large domains on Dom0 memory
> usage by means of fadvise64() to tell the OS to discard the cache pages
> used for the save/dump file.
> 
> Signed-off-by: Simon Graham <Simon.Graham@xxxxxxxxxxx>

Could the fadvise() logic be shared more than it is in this patch? Also you
sometimes sync-then-fadvise. Is this just a performance enhancement
(presumably fadvise wouldn't simply discard dirty pages in the buffer
cache)?

 -- Keir


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