[Xen-devel] [PATCH] 3.0.4: Fix softlockup issue after migration

["Graham, Simon" <Simon.Graham@xxxxxxxxxxx>]

We had a discussion about this back at the beginning of Jan; in the end,
I made a patch for 3.0.4 that seems to fix the soft lockups when a
domain is not scheduled for a significant amount of time (for example,
following migration) - I'm submitting this for inclusion in 3.0.4 rather
than unstable because the fix would be different (I'm not even sure it's
required there yet).

Basic idea is to keep touching the watchdog timer inside the loop that
handles simulating all the timer ticks that have been missed.

We've been running this for the past month and it has completely fixed
the spurious soft lockups whilst not masking real soft lockups due to
hangs inside the domain.

Simon

--------------------------------------------------------------

Remove spurious soft lockups that occur when a domain is not scheduled
for a long time.

Signed-off-by: Simon graham <Simon.graham@xxxxxxxxxxx>

Attachment: xen-304-softlockup.patch
Description: xen-304-softlockup.patch

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