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

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Message-ID: <20090222142351.GG1586@ucw.cz>
Date:	Sun, 22 Feb 2009 15:23:51 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	paulmck@...ux.vnet.ibm.com,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Bryan Wu <cooloney@...nel.org>, linux-kernel@...r.kernel.org,
	ltt-dev@...ts.casi.polymtl.ca,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [ltt-dev] [RFC git tree] Userspace RCU (urcu) for Linux
	(repost)


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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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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