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

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Date:	Thu, 5 Mar 2009 09:39:03 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
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

On Thu, 5 Mar 2009, Lai Jiangshan wrote:

> 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.

But you can start with the descriptor at the beginning of the page and
scan until you find the object.

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