linux-kernel - Re: [PATCH] lglock: make lg_lock_global() actually lock globally

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Message-ID: <1282895985.1975.1717.camel@laptop>
Date:	Fri, 27 Aug 2010 09:59:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lglock: make lg_lock_global() actually lock globally

On Fri, 2010-08-27 at 09:57 +0200, Peter Zijlstra wrote:
> 
> 
> There's a large three lettered company that's promoting cpu hotplug use
> for power management, they hotplug at an astonishing rate.
> 
> I've been saying hotplug isn't for that, and its a terrible slow path
> and disrupts your whole machine etc.. they don't seem to care much. 

Oh, and the virt community seems to want (or is) doing the same silly
thing.
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