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

From: Wenchao Xia
Subject: Re: [Qemu-devel] [Qemu-ppc] broken incoming migration
Date: Thu, 13 Jun 2013 10:41:16 +0800
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130509 Thunderbird/17.0.6

于 2013-6-13 4:10, Paolo Bonzini 写道:
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
  I think it is the right way to improve overcommit without breaking

what Peter's patches do, I'll review them right away.


Best Regards

Wenchao Xia

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