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

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Date:	Wed, 17 Dec 2014 16:15:34 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Jesper Dangaard Brouer <brouer@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	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>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH 3/7] slub: Do not use c->page on free

2014-12-17 0:48 GMT+09:00 Christoph Lameter <cl@...ux.com>:
> 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.

Possibly, we can use _count field.

Thanks.
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