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    SubjectRe: [RFC][PATCH 6/8] mm: handle_speculative_fault()
    On Tue, 5 Jan 2010, Andi Kleen wrote:

    > > Oh well. Somebody who is bored might look at trying to make the wrapper
    > > code in arch/x86/lib/semaphore_32.S work on x86-64 too. It should make the
    > > successful rwsem cases much faster.
    >
    > Maybe, maybe not.

    What we saw in the past was that the cost of acquiring exclusive
    access to the contended cachelines containing mmap_sem and rss counters
    was most important.



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