Messages in this thread | | | Date | Fri, 11 May 2007 11:05:22 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 1/2] scalable rw_mutex |
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On Fri, 11 May 2007 10:07:17 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
> On Fri, 11 May 2007, Andrew Morton wrote: > > > yipes. percpu_counter_sum() is expensive. > > Capable of triggering NMI watchdog on 4096+ processors?
Well. That would be a millisecond per cpu which sounds improbable. And we'd need to be calling it under local_irq_save() which we presently don't. And nobody has reported any problems against the existing callsites.
But it's no speed demon, that's for sure. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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