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

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Date:	Thu, 26 Aug 2010 12:08:08 +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 Thu, 2010-08-26 at 19:46 +1000, Nick Piggin wrote:
> Why is that? Don't tell me realtime people want some latency "guarantee"
> while onlining CPUs? :) 

I think its only done because we can, don't use kstopmachine if you
don't have to etc..

We tell people who do RT not to hotplug, not load modules etc..
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