Messages in this thread | | | Date | Mon, 30 Sep 2013 15:35:08 -0400 | From | Waiman Long <> | Subject | Re: [PATCH, v2] anon_vmas: Convert the rwsem to an rwlock_t |
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On 09/30/2013 03:23 PM, Tim Chen wrote: > On Mon, 2013-09-30 at 20:14 +0200, Peter Zijlstra wrote: >> On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote: >>> Here's the exim workload data: >>> >>> rwsem improvment: >>> Waimain's patch: +2.0% >>> Alex+Tim's patchset: +4.8% >>> Waiman+Alex+Tim: +5.3% >>> >>> convert rwsem to rwlock_t for root anon_vma lock >>> Ingo's patch +11.7% >>> >> What happens if you stuff Waiman's qrwlock patches on top of that? >> admittedly and oft mentioned in this thread, our current rwlock_t is >> somewhat suboptimal under a number of conditions. > I've tested with Waiman's qrwlock patches on top of Ingo's patches. > It does not affect the throughput for exim and I still get > about +11.7% throughput change (same as with Ingo's patch only). > > Tim >
My qrwlock doesn't enable qrwlock by default. You have to use menuconfig to explicitly enable it. Have you done that when you build the test kernel? I am thinking of explicitly enabling it for x86 if the anon-vma lock is converted back to a rwlock.
-Longman
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