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xen-devel
Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation
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To: |
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation |
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From: |
Avi Kivity <avi@xxxxxxxxxx> |
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Date: |
Sun, 01 Nov 2009 11:28:49 +0200 |
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Cc: |
Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, kurt.hackel@xxxxxxxxxx, Glauber Costa <glommer@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, zach.brown@xxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, chris.mason@xxxxxxxxxx |
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Sun, 01 Nov 2009 01:29:59 -0800 |
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On 10/29/2009 06:15 PM, Dan Magenheimer wrote:
On a related note, though some topic drift, many of
the problems that occur in virtualization due to migration
could be better addressed if Linux had an architected
interface to allow it to be signaled if a migration
occurred, and if Linux could signal applications of
the same. I don't have any cycles (pun intended) to
think about this right now, but if anyone else starts
looking at it, I'd love to be cc'ed.
IMO that's not a good direction. The hypervisor should not depend on
the guest for migration (the guest may be broken, or malicious, or being
debugged, or slow). So the notification must be asynchronous, which
means that it will only be delivered to applications after migration has
completed.
Instead of a "migration has occured, run for the hills" signal we're
better of finding out why applications want to know about this event and
addressing specific needs.
--
error compiling committee.c: too many arguments to function
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