4e01799aea
Add a sched_yield() syscall if the thread spins for too long, waiting other thread to finish its operations on the ring. That gives pre-empted thread a chance to proceed and finish with ring enqueue/dequeue operation. The purpose is to reduce contention on the ring. By ring_perf_test, it doesn't shows additional perf penalty. Signed-off-by: Cunming Liang <cunming.liang@intel.com> Acked-by: Olivier Matz <olivier.matz@6wind.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>