Re: [PATCH, v2] anon_vmas: Convert the rwsem to an rwlock_t

[Peter Zijlstra]

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.
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