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xen-devel
[Xen-devel] RE: TODO in windows balloon driver
Ye, You are right, it happens when xen doesn't have enough pages for the VM.
And windows will crash now.
In memory overcommit, If there are many VMs on a physical host, and in dom0 use a daemon for
memory managment between VMS, it is possible that xen has no pages for the VM needs memory.
So I think , it is better to fix it.
Thanks.
> Subject: RE: TODO in windows balloon driver > Date: Sat, 26 Feb 2011 23:17:54 +1100 > From: james.harper@xxxxxxxxxxxxxxxx > To: tinnycloud@xxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx > > > > > HI James: > > > > I've noticed the TODO tag in xenpci/xenpci_fdo.c, line 294 > > > > 290 KdPrint((__DRIVER_NAME " Calling > > HYPERVISOR_memory_op(XENMEM_populate_physmap) - pfn_count = %d\n", > > pfn_count)); > > 291 ret = HYPERVISOR_memory_op(xpdd, > XENMEM_populate_physmap, > > &reservation); > > 292 ExFreePoolWithTag(pfns, XENPCI_POOL_TAG); > > 293 KdPrint((__DRIVER_NAME " populated %d pages\n", > ret)); > > 294 /* TODO: what do we do if less than the required number > of > > pages were populated??? can this happen??? */ > > > > > > Could we fix it in linux balloon driver way?<
BR>> > When no enough pfn_count got, give memory back to xen. > > What do you think? > > Thanks. > > I guess that would work, but then it would keep trying to decrease again > every second. Maybe that's what we want but I'd rather put in some sort > of backoff in there eg retry in one second then two seconds then 4 > seconds etc up to a maximum of 1 minute or so, to reduce the noise. > > Are you seeing this happen? I'm guessing it's because xen doesn't have > enough pages for you or because you've ballooned up above the maxmem > limit or something... > > James >
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