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    SubjectRe: [patch 5/9] Convert anon_vma lock to rw_sem and refcount
    On Tue, Apr 01, 2008 at 01:55:36PM -0700, Christoph Lameter wrote:
    > This results in f.e. the Aim9 brk performance test to got down by 10-15%.

    I guess it's more likely because of overscheduling for small crtitical
    sections, did you counted the total number of context switches? I
    guess there will be a lot more with your patch applied. That
    regression is a showstopper and it is the reason why I've suggested
    before to add a CONFIG_XPMEM or CONFIG_MMU_NOTIFIER_SLEEP config
    option to make the VM locks sleep capable only when XPMEM=y
    (PREEMPT_RT will enable it too). Thanks for doing the benchmark work!

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      Last update: 2008-04-02 19:53    [W:0.018 / U:5.584 seconds]
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