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

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

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.

Paolo

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