Re: [patch] powerpc: hash lock use lock bitops

On Tue, 2007-11-20 at 07:26 +0100, Nick Piggin wrote:

BTW, here is another thing which you might want to think about. Again
untested for temporary lack of hardware.

--

The radix-tree is now RCU safe, so powerpc can avoid the games it was playing
in order to have a lockless readside. Saves an irq disable/enable, a couple of
__get_cpu_var()s, a cacheline, and a memory barrier, in the fastpath. Should
save a cycle or two...

Yup, I know. I need to work on that for -rt anyway due to other issues...

Thanks !

Ben.