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Re: [Qemu-devel] [PATCH 1/1] virtio-balloon: reset the statistic timer t
Denis V. Lunev
Re: [Qemu-devel] [PATCH 1/1] virtio-balloon: reset the statistic timer to load device
Tue, 5 Apr 2016 11:47:55 +0300
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On 03/29/2016 05:18 PM, Denis V. Lunev wrote:
On 03/29/2016 05:07 PM, Michael S. Tsirkin wrote:
On Tue, Mar 29, 2016 at 05:00:49PM +0300, Denis V. Lunev wrote:
From: Pavel Butsykin <address@hidden>
If before loading snapshot we had set the timer of statistics, then
applying snapshot the expiry time would be irrelevant for the restored
state of the virtual clocks. A simple fix is just to restart the timer
after loading snapshot.
For the user it may look like a long delay of statistics update
to the snapshot.
Signed-off-by: Pavel Butsykin <address@hidden>
Reviewed-by: Roman Kagan <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
I'm inclined to think we really should migrate the timer,
otherwise user might wait twice as long as expected ...
this is not a big deal. This timer is a part of the QEMU state,
which was configured for this exact running instance, not
for the guest. Moreover, we have switched to new guest state
which can be on the different CPU with different timings etc
and thus we should let the guest to run for some time.
In the perfect world you should not save the time to the migration
state but save the time at reset callback and restore it here at
postload, but this seems over engineering.
Statistics delivery is "best effort", nobody will die if one
shot will be missed.
could you pls select on of the options below to highlight way
to merge pls?
1) keep code as is. Restarting timer to new policy is fine
2) restart with the remaining timeout of previous timer
For me 1) is fine, though...
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