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

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Message-ID: <1282817329.1975.486.camel@laptop>
Date:	Thu, 26 Aug 2010 12:08:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Nick Piggin <npiggin@...nel.dk>,
	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 11:49 +0200, Tejun Heo wrote:
> If there's a pressing need, doing stop_machine for
> onlining too is definitely an option. 

I would argue against that.. we should try and rid ourselves of
stopmachine, not add more dependencies on it. If you want to sync
against preempt_disable thingies synchronize_sched() is your friend.
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