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[Xen-devel] Question to [PATCH 2 of 3] PoD: Allow pod_set_cache_target hypercall to be preempted

To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>

From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>

Date: Tue, 15 Mar 2011 10:00:11 +0100

Cc: Dunlap <George.Dunlap@xxxxxxxxxxxxx>

Delivery-date: Tue, 15 Mar 2011 02:01:45 -0700

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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Hi,

we stumbled over this problem fixed in

http://lists.xensource.com/archives/html/xen-devel/2011-01/msg01155.html

on SLES11 SP1 with domU's with memory >= 64GB.

The effect was that dom0 seemed to hang even though our dom0 were running

on 3 cpus.

Now my question:

I had a look at hypercall_create_continuation() and my understanding is that

the caller on this cpu is prepared to start the hypercall again after

getting scheduled next time and the hypercall is finished immediately to

deliver irqs and events.

But what about the other cpus in dom0? Are these waiting for an irq/event from

the cpu handling the long running hypercall?

How do these benefit from this hypercall continuation?

Thanks!

Dietmar.

Company details: http://ts.fujitsu.com/imprint.html

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