On 02/23/2012 03:25 PM, Peter Zijlstra wrote: > On Thu, 2012-02-23 at 20:33 +0900, Takuya Yoshikawa wrote: > > - Stop allocating extra dirty bitmap buffer area > > > > According to Peter, mmu_notifier has become preemptible. If we can > > change mmu_lock from spin_lock to mutex_lock, as Avi said before, this > > would be staightforward because we can use __put_user() right after > > xchg() with the mmu_lock held > > So the 'only' thing to consider is running the end result with lockdep > enabled since the mmu locks are rather deep in the nesting tree its very > easy to accidentally cause inversions. There will be an inversion for sure, if __put_user() faults and triggers an mmu notifier (perhaps directly, perhaps through an allocation that triggers a swap). -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
