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Re: [Xen-devel] [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS

Il 07/07/2014 17:35, Peter Zijlstra ha scritto:
> Unlike the change in patch 4, clear_pending_set_locked doesn't change how
> qspinlock moves from a state to the next.
True, but its where we start to break up into smaller functions. And the
only reason we break them out is because we'll get different
implementations depending on NR_CPUS.

So we can view the breakout of xchg_tail and clear_and_set_pending as
preparatory work for introducing the NR_CPUS thing.

That's a different reasoning, but it's fine by me too.


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