Re: [ltt-dev] [RFC git tree] Userspace RCU (urcu) for Linux(repost)

[Pavel Machek]

Hi!

> > If Blackfin handles hotplug CPU, that may
> > need attention as well, since tasks affinitied to the CPU being removed
> > can end up with their affinity set to all CPUs.  And there are probably
> > other issues.
> 
> no, we dont support hotplugging of CPUs.  there is no hardware support
> for it, so i think the only thing you'd gain is perhaps power savings
> ?  not sure it would even work in our case though as the hardware does
> not support restarting or shutdown of one core ... they both have to
> restart/shutdown.  putting one core into a constant idle loop would
> save power, but that can already be accomplished by reducing the apps
> that go onto a specific core.

Well, cpu hotplug is needed for suspend and hibernation...

-- 
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