Re: [PATCH v4] membarrier: expedited private command

[Dave Watson]

On 07/28/17 04:40 PM, Mathieu Desnoyers wrote:
> Implement MEMBARRIER_CMD_PRIVATE_EXPEDITED with IPIs using cpumask built
> from all runqueues for which current thread's mm is the same as the
> thread calling sys_membarrier. It executes faster than the non-expedited
> variant (no blocking). It also works on NOHZ_FULL configurations.

I tested this with our hazard pointer use case on x86_64, and it seems
to work great.  We don't currently have any uses needing SHARED.

Tested-by: Dave Watson <davejwatson@xxxxxx>

Thanks!

https://github.com/facebook/folly/blob/master/folly/experimental/hazptr/hazptr-impl.h#L555
https://github.com/facebook/folly/blob/master/folly/experimental/AsymmetricMemoryBarrier.cpp#L86