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Nitin Garg authored
Summary: Spinlocks in user space are generally a bad idea due to tendency to burn CPU in outlier events. Replace it with SharedMutex instead. The common case cost could go up a bit should be better overall. Reviewed By: yfeldblum Differential Revision: D31654923 fbshipit-source-id: 77d249293458cd740904f777e00be1bd6834b62f
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