* Andrew Morton <[email protected]> wrote:
> > FYI, the lock_cpu_hotplug() rewrite proposed by Gautham at
> > http://lkml.org/lkml/2006/10/26/65 may still need refinement to
> > avoid all the kind of deadlocks we have unearthed with workqueue
> > example. I can review that design with Gautham if there is some
> > interest to revive lock_cpu_hotplug() ..
>
> Has anyone thought seriously about using the process freezer in the
> cpu-down/cpu-up paths? That way we don't need to lock anything
> anywhere?
yes, yes, yes - lets please do that! The process freezer is already used
for suspend, for hibernate and recently for kprobes - so its performance
and robustness is being relied on and verified from multiple angles. I
can see no reason why it couldnt be made really fast even on large
boxes, if the need arises. (but even the current one is fast enough for
any human-driven CPU hotplug stuff)
Ingo
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