linux-kernel - Re: [PATCH 3/7] slub: Do not use c->page on free

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Message-ID: <alpine.DEB.2.11.1412160948240.27999@gentwo.org>
Date:	Tue, 16 Dec 2014 09:48:43 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	akpm@...uxfoundation.org, rostedt@...dmis.org,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH 3/7] slub: Do not use c->page on free

On Tue, 16 Dec 2014, Jesper Dangaard Brouer wrote:

> > Ok but now there is a multiplication in the fast path.
>
> Could we pre-calculate the value (page->objects * s->size) and e.g store it
> in struct kmem_cache, thus saving the imul ?

I think I just used the last available field for the page->address.

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