Messages in this thread | | | Subject | Re: [RFC PATCH] asynchronous page fault. | From | Peter Zijlstra <> | Date | Mon, 28 Dec 2009 09:30:47 +0100 |
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On Mon, 2009-12-28 at 09:36 +0900, KAMEZAWA Hiroyuki wrote: > > > The idea is to let the RCU lock span whatever length you need the vma > > for, the easy way is to simply use PREEMPT_RCU=y for now, > > I tried to remove his kind of reference count trick but I can't do that > without synchronize_rcu() somewhere in unmap code. I don't like that and > use this refcnt.
Why, because otherwise we can access page tables for an already unmapped vma? Yeah that is the interesting bit ;-)
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