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Re: [Xen-devel] [PATCH] fs-backend: fix gnttab unmap

To: Keith Coleman <list.keith@xxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] fs-backend: fix gnttab unmap
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 23 Mar 2009 10:48:38 +0000
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Keith Coleman wrote:

> On Thu, Mar 19, 2009 at 12:58 PM, Stefano Stabellini
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>> Hi all,
>> when a stubdom is destroyed, fs-backend does not correctly unmap all the
>> pages mapped for the shared ring.
>> This causes some pages not to be properly freed by xen, hence after a
>> cycle of 50 save\restore we don't have enough spare memory to start 2
>> VMs any more.
>> This patch fixes the issue properly unmapping all the pages needed by
>> the shared ring.
> I can confirm that fs-backend is more stable. I have performed
> hundreds of save/restore cycles without issue.

good, thanks again for testing.

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