[Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

Stamp softlockup thread earlier before do_timer, because the
latter is the one to actually trigger lock warning for
long-time offline. Or else, I obserevd softlockup warning
easily at manual vcpu hot-remove/plug, or when suspend cancel
into old context.

One point here is to cover both stolen and blocked time to
compare with offline threshold. vcpu hotplug falls into 'stolen'
case, but it's not enough. Considering xen time model is tickless
at idle, it's possible that big block time is requested which
also inflames softlockup thread.

Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>

Thanks,
Kevin

Attachment: fix_softlockup.patch
Description: fix_softlockup.patch

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