Messages in this thread | | | From | Ulrich Drepper <> | Date | Tue, 6 Apr 2010 07:47:41 -0700 | Subject | Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptive spinning |
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On Tue, Apr 6, 2010 at 01:48, Peter Zijlstra <peterz@infradead.org> wrote: > try > spin > try > syscall
This is available for a long time in the mutex implementation (PTHREAD_MUTEX_ADAPTIVE_NP mutex type). It hasn't show much improvement if any. There were some people demanding this support for as far as I know they are not using it now. This is adaptive spinning, learning from previous calls how long to wait. But it's still unguided. There is no way to get information like "the owner has been descheduled". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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