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Re: [Qemu-devel] [Qemu-ppc] broken incoming migration

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [Qemu-ppc] broken incoming migration
Date: Wed, 12 Jun 2013 16:10:38 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 12/06/2013 10:11, Benjamin Herrenschmidt ha scritto:
> On Wed, 2013-06-12 at 10:00 -0400, Paolo Bonzini wrote:
>> The only bug we have is not a performance bug related to compression;
>> it's that writing zero pages breaks overcommit.  Let's fix that, and
>> only that.
> Right, do we have a way to madvise "throw away" these instead ?

We already do that, but apparently that madvise is asynchronous.

> Or do we
> have a way to track that the platform init code did write something
> there and only clear *those* pages ?

No need for; since it's copy-on-write, not copy-on-read :) we can just
check for pages that are zero and not rewrite them with zeros.  That's
what Peter's patches do, I'll review them right away.


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