>
> Runtime tricks that increase complexity cost, yes. It's all a question
> of measured gain vs. complexity. But a couple of percent gained on an
> overall basis can be magnified enormously if you are looking at a
> workload that stresses a particular path.
a couple of percents sounds really really high to me. If it's really
that then I think Andi's conclusion is wrong with respect to that
locking cliff; if we spend a few percent of our performance on locks in
the uncontended case we're way over the edge in my opinion.
> I would expect some of those
> gains to be non-trivial, especially if considering the optimizations you
> could do on page table updates knowing you needn't worry about SMP
page table updates happen in the hypervisor in a xen like
paravirtualized setup right? so that happens outside the kernel..
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