linux-kernel - Re: [PATCH -mm 3/6] slub: introduce __kfree

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Message-ID: <49AF28C4.1000300@cn.fujitsu.com>
Date:	Thu, 05 Mar 2009 09:20:04 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 3/6] slub: introduce __kfree_rcu

Christoph Lameter wrote:
> On Tue, 3 Mar 2009, Lai Jiangshan wrote:
> 
>> +
>> +void __kfree_rcu(const void *x, struct rcu_head *rcu)
>> +{
>> +	call_rcu(rcu, kfree_rcu_callback);
>> +}
>> +EXPORT_SYMBOL(__kfree_rcu);
>> +
> 
> The parameter x is unused why require it? I see that SLOB needs it. Cant
> you do a similar trick as in SLUB just calculating the start address of
> the object from the rcu address?
> 


The first parameter of __kfree_rcu() is unused in slab,slub,slqb.
(I used it before, for CONFIG_SLUB_DEBUG=y ...etc. But I found
these debugging code is needless)

Object sizes of the memory objects in slob's kmalloc-slab are various.
We hardly calculate the start address of the object from the rcu address.

Lai


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