Messages in this thread | | | Date | Mon, 7 Nov 2011 16:32:20 +0100 | From | Andrea Arcangeli <> | Subject | Re: [PATCH] mremap: skip page table lookup for non-faulted anonymous VMAs |
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On Mon, Nov 07, 2011 at 12:21:35PM +0800, Nai Xia wrote: > If an anonymous vma has not yet been faulted, move_page_tables() in move_vma() > is not necessary for it.
I actually thought of adding that (in fact fork has it and it's more likely to be beneficial for fork than for mremap I suspect), but this adds a branch to the fast path for a case that shouldn't normally materialize. So I don't think it's worth adding it as I expect it to add overhead in average.
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