linux-kernel - Re: [RFC PATCH] rcu: introduce kfree

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Date:	Fri, 19 Sep 2008 18:03:20 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Lai Jiangshan <laijs@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH] rcu: introduce kfree_rcu()

Paul E. McKenney wrote:
> The rcu_barrier() family of functions registers a callback on each CPU,
> and waits until all these callbacks have been invoked.  The CPU offlining
> process preserves the order of the callbacks that were registered on a
> given CPU.  Thus, when rcu_barrier() returns, all RCU callbacks previously
> registered are guaranteed to have already been invoked, regardless of
> what CPUs might have been offlined and onlined in the meantime.
>
>   
You are right: I mixed up rcu_barrier() and synchronize_rcu().

--
    Manfred
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