Messages in this thread | | | Date | Fri, 26 Nov 2010 00:10:51 -0800 | From | Jeremy Fitzhardinge <> | Subject | Could we do immediate pte zaps in vunmap? |
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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.
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.
Thanks, J
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