Messages in this thread | | | Date | Wed, 28 Aug 2013 12:46:30 +0300 | From | Gleb Natapov <> | Subject | Re: [PATCH 09/12] KVM: MMU: introduce pte-list lockless walker |
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On Wed, Aug 28, 2013 at 05:33:49PM +0800, Xiao Guangrong wrote: > > Or what if desc is moved to another rmap, but then it > > is moved back to initial rmap (but another place in the desc list) so > > the check here will not catch that we need to restart walking? > > It is okay. We always add the new desc to the head, then we will walk > all the entires under this case. > Which races another question: What if desc is added in front of the list behind the point where lockless walker currently is?
> Right? Not sure. While lockless walker works on a desc rmap can be completely destroyed and recreated again. It can be any order.
-- Gleb.
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