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

From: Pavel Machek
Date: Sun Feb 22 2009 - 09:24:34 EST



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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