On 10/24, Gautham R Shenoy wrote:
>
> On Wed, Oct 24, 2007 at 10:04:41AM -0700, Christoph Lameter wrote:
> > On Wed, 24 Oct 2007, Gautham R Shenoy wrote:
> >
> > > This is the version 2 of the refcount based cpu-hotplug "locking"
> > > implementation.
> >
> > Uggh. This introduces a global lock that has to be taken always when
> > scanning over cpus?
>
> Well, no! we take the global lock only while bumping up the refcount.
> We don't hold the lock while scanning over the cpus. And this is
> definitely an improvement over the lock_cpu_hotplug() global mutex
> we have now.
Just to be sure I didn't miss something... preempt_disable() still works,
yes?
Oleg.
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