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    SubjectRe: A quick view of the performance benchmark for semaphore-like and mutex
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    On Tue, 2012-04-17 at 09:36 +0000, Chen, Dennis (SRDC SW) wrote:
    > Just as a quick & rough test, with below changes based on mutex (almost the same as semaphore):
    >
    > --- /home/dennis/Linux/linux-3.3.2-sem/kernel/mutex.c 2012-04-17 14:59:49.823177615 +0800
    > +++ ./mutex.c 2012-04-17 17:00:12.963059284 +0800
    > @@ -140,6 +140,7 @@ __mutex_lock_common(struct mutex *lock,
    > preempt_disable();
    > mutex_acquire_nest(&lock->dep_map, subclass, 0, nest_lock, ip);
    >
    > +#if 0
    > #ifdef CONFIG_MUTEX_SPIN_ON_OWNER
    > /*
    > * Optimistic spinning.
    > @@ -195,6 +196,7 @@ __mutex_lock_common(struct mutex *lock,
    > arch_mutex_cpu_relax();
    > }
    > #endif
    > +#endif
    > spin_lock_mutex(&lock->wait_lock, flags);
    >
    > debug_mutex_lock_common(lock, &waiter);


    or you do:

    echo NO_OWNER_SPIN > /debug/sched_features



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