Messages in this thread | | | Date | Wed, 2 Apr 2008 19:50:58 +0200 | From | Andrea Arcangeli <> | Subject | Re: [patch 5/9] Convert anon_vma lock to rw_sem and refcount |
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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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