On 01/12/16 14:21, Michael S. Tsirkin wrote:
>
> OK so I'll have to tweak the test to put something
> on stack to measure the difference: my test tweaks a
> global variable instead.
> I'll try that by tomorrow.
>
> I couldn't measure any difference between mfence and lock+addl
> except in a micro-benchmark, but hey since we are tweaking this,
> let's do the optimal thing.
>
Be careful with this: if it only shows up in a microbenchmark, we may
introduce a hard-to-debug regression for no real benefit.
-hpa
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