Re: REGRESSION: Performance regressions from switchinganon_vma->lock to mutex

[Peter Zijlstra]

On Wed, 2011-06-15 at 09:18 -0700, Andi Kleen wrote:

> And in general it looks like blind conversion from spinlock to mutex
> is a bad idea right now.

For 4 socket machines, maybe. On 2 sockets I cannot reproduce anything.

I wonder if its the fairness thing, the mutex spinners aren't fifo fair
like the ticket locks are. It could be significant with larger socket
count since their cacheline arbitration is more sucky.



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