Re: Error restoring DomU when using GPLPV

[Mukesh Rathor <mukesh.rathor@oracle.com>]

just in case someone missed the thread earlier,

3 = 1 shinfo + 2 gnt frames default.

so, tot_pages + shinfo + num gnt frames.


Mukesh



Dan Magenheimer wrote:
> 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@eu.citrix.com]
>> 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@oracle.com> 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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