linux-kernel - Re: [PATCH 2/7] slub: Use page-mapping to store address of page frame like done in SLAB

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Message-ID: <CAOJsxLHk6jUej0kqBtUnjUbEKOfZDRaSLyG_f=TJm9ogLZbArA@mail.gmail.com>
Date:	Wed, 10 Dec 2014 18:45:18 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	akpm <akpm@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, iamjoonsoo@....com,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH 2/7] slub: Use page-mapping to store address of page frame
 like done in SLAB

On Wed, Dec 10, 2014 at 6:30 PM, Christoph Lameter <cl@...ux.com> wrote:
> SLAB uses the mapping field of the page struct to store a pointer to the
> begining of the objects in the page frame. Use the same field to store
> the address of the objects in SLUB as well. This allows us to avoid a
> number of invocations of page_address(). Those are mostly only used for
> debugging though so this should have no performance benefit.
>
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Reviewed-by: Pekka Enberg <penberg@...nel.org>
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