Messages in this thread | | | Date | Sat, 27 Nov 2010 21:36:56 +1100 | From | Nick Piggin <> | Subject | Re: Could we do immediate pte zaps in vunmap? |
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On Fri, Nov 26, 2010 at 12:10:51AM -0800, Jeremy Fitzhardinge wrote: > What if vm_unmap_ram() and co. immediately zeroed out the ptes, but > lazily deferred the tlb flushes? It seems to me there's no benefit in > batching up the pte clearing since that can't be amortized like the tlb > flush.
Yes that can be done.
> I think that would solve the problem we have with the interactions > between lazy unmap and Xen. The issue is having stray pte entries > around (because Xen keeps track of those as part of its page-type > mechanism), but stale tlb entries are no problem.
It would be great if that solves it.
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