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Date: Wed, 17 Dec 2014 16:15:34 +0900
Message-ID: <CAAmzW4MaGCCq4_pz+9dFDY+0X+3qcfr4aTSPsjt8ejkV9WbMnA@mail.gmail.com>
Subject: Re: [PATCH 3/7] slub: Do not use c->page on free
From: Joonsoo Kim <js1304@gmail.com>
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To: Christoph Lameter <cl@linux.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, akpm@linuxfoundation.org, Steven Rostedt <rostedt@goodmis.org>, LKML <linux-kernel@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Pekka Enberg <penberg@kernel.org>

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