On Mon, Oct 09, 2017 at 12:30:52AM +0300, Yury Norov wrote: > The bottomline of discussion [1] was that queued locks are more > effective when SoC has many CPUs. And 4 is not many. qspinlock, yes. qrwlock not, as it fully depends on arch_spinlock_t for the queueing. qrwlock is just a generic rwlock_t implementation.