Messages in this thread |  | | | Date | Sat, 17 Dec 2005 15:05:35 -0800 (PST) | | Subject | Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation | | From | "David S. Miller" <> |
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From: Richard Henderson <rth@twiddle.net> Date: Sat, 17 Dec 2005 14:38:24 -0800
> You might consider just beginning your loops like > > mov zero, old > cas [mem], zero, old > > to do the initial read, since old will now contain the > contents of the memory, and we havn't changed the memory.
CAS is 32 cycles minimum on sparc64 even on a cache hit, so I think the prefetch+load will be faster :-) But it deserves checking out, that's for sure.
Either way, that is a clever use of CAS :) - 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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