Messages in this thread | | | Date | Tue, 27 Nov 2012 16:56:30 +0100 | Subject | Re: [RFC PATCH] Fix abnormal rcu dynticks_nesting values related to async page fault | From | Frederic Weisbecker <> |
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2012/11/27 Gleb Natapov <gleb@redhat.com>: > For KVM_PV_REASON_PAGE_NOT_PRESENT it behaves like an exception.
Ok. There seem to be a bug in kvm_async_pf_task_wait(). Using idle_cpu(cpu) to find out if the current task is the idle task may not work if there is pending wake up. Me may schedule another task but when that other task sleeps later we can't schedule back to idle until the fault is completed.
The right way is to use is_idle_task(current)
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