On Sun, 8 Jul 2007, Andi Kleen wrote:
> I would say the main drawback of switchable and queued locks
> would be also that they require a larger spinlock_t thus increasing
> cache usage
Right. Zoran Radovic has shown that queued locks are inferior
to other approaches. The best approach that he found in his research were
the HBO locks that are somewhat more intelligent form of spinlocks.
http://user.it.uu.se/~zoranr/
http://www.it.uu.se/research/group/uart/projects/nucasynch/
Paper on the issue with measurements:
http://www.it.uu.se/research/publications/lic/2003-008/2003-008.pdf
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