Messages in this thread | | | From | Andi Kleen <> | Subject | Re: Why Semaphore Hardware-Dependent? | Date | Sun, 27 Aug 2006 23:39:08 +0200 |
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On Sunday 27 August 2006 23:05, Christoph Lameter wrote: > On Sun, 27 Aug 2006, Andi Kleen wrote: > > > rwsems don't -- there are two flavours: a generic spinlock'ed one and a > > complicated atomic based one that only works on some architectures. > > As far as I know nobody has demonstrated a clear performance increase > > from the first so it might be possible to switch all to the generic > > implementation. > > Yup that would be the major issue.I'd be interested to see some tests in > that area.
x86-64 always uses the spinlocked version (vs i386 using the atomic one) and I haven't heard of anybody complaining.
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