linux-kernel - Re: [PATCH V5 1/1] rcu: introduce kfree

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Message-Id: <201103180914.31464.arnd@arndb.de>
Date:	Fri, 18 Mar 2011 09:14:31 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	paulmck@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [PATCH V5 1/1] rcu: introduce kfree_rcu()

On Friday 18 March 2011, Lai Jiangshan wrote:
> kfree_rcu() which was original proposed by Lai 2.5 years ago is one of
> the most important RCU TODO list entries, Lai and Manfred have worked on
> patches for this. This V4 patch is based on the Manfred's patch and
> the V1 of Lai's patch. (These two patches are almost the same
> in implementation, and this patch is mainly based on the Manfred's).
> 
> Lai's V1 patch: http://lkml.org/lkml/2008/9/18/1
> Manfred's patch: http://lkml.org/lkml/2009/1/2/115
> RCU TODO list: http://www.kernel.org/pub/linux/kernel/people/paulmck/rcutodo.html
> 
> This new introduced API kfree_rcu() primitive kfree()s the specified memory
> after a RCU grace period elapses.
> 
> It replaces many simple "call_rcu(head, simple_kfree_callback)";
> These many simple_kfree_callback() instances just does
> 
>         kfree(containerof(head,struct whatever_struct,rcu_member));
> 
> These simple_kfree_callback() instances are just duplicate code, we need
> a generic function for them.
> 
> And kfree_rcu() is also help for unloadable modules, kfree_rcu() does not
> queue any function which belong to the module, so a rcu_barrier() can
> be avoid when module exit. (If we queue any other function by call_rcu(),
> rcu_barrier() is still needed.)
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> Signed-off-by: Manfred Spraul <manfred@...orfullife.com>

Acked-by: Arnd Bergmann <arnd@...db.de>
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