Before we close down this thread, I have a concern:
According to Mukesh, the fix to this bug is dependent
on the pv drivers tracking tot_pages for a domain
and ballooning to ensure tot_pages+3 does not exceed
max_pages for the domain.
Well, tmem can affect tot_pages for a domain inside
the hypervisor without any notification to pv drivers
or the balloon driver. And I'd imagine that PoD and
future memory optimization mechanisms such as
swapping and page-sharing may do the same.
So this solution seems very fragile.
Dan
-----Original Message-----
From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
Sent: Wednesday, September 16, 2009 6:28 AM
To: Annie Li
Cc: Joshua West; Dan Magenheimer; xen-devel; Kurt Hackel;
James Harper;
Wayne Gong
Subject: Re: [Xen-devel] Error restoring DomU when using GPLPV
On 16/09/2009 12:10, "ANNIE LI" <annie.li@xxxxxxxxxx> wrote:
I will do more test to make sure it and update here.
I tried to map 256 grant frames during initialization and
balloon down
256+1(shinfo+gnttab) pages driver first
load. Then i did save/restore for 50 times, and live
migration for 10
times. No error occurs.
Okay, well I still can't explain why that fixes it, but
clearly it does. So
that's good. :-)
-- Keir
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