On 02/20/2015 05:05 PM, Andi Kleen wrote: > Daniel Wagner <daniel.wag...@bmw-carit.de> writes: >> >> I am looking at how to get rid of lglock. Reason being -rt is not too >> happy with that lock, especially that it uses arch_spinlock_t and > > AFAIK it could just use normal spinlock. Have you tried that?
I have tried it. At least fs/locks.c didn't blow up. The benchmark results (lockperf) indicated that using normal spinlocks is even slightly faster. Simply converting felt like cheating. It might be necessary for the other user (kernel/stop_machine.c). Currently it looks like there is some additional benefit getting lglock away in fs/locks.c. cheers, daniel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
