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

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Message-ID: <CAPAsAGxVaucq5yOWiMztL4MGwpKGbC=WuhWFagXQ0UtWtPoqbw@mail.gmail.com>
Date:	Tue, 16 Dec 2014 19:33:15 +0400
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....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>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH 3/7] slub: Do not use c->page on free

2014-12-16 17:53 GMT+03:00 Christoph Lameter <cl@...ux.com>:
> On Tue, 16 Dec 2014, Joonsoo Kim wrote:
>
>> > Like this:
>> >
>> >         return d > 0 && d < page->objects * s->size;
>> >
>>
>> Yes! That's what I'm looking for.
>> Christoph, how about above change?
>
> Ok but now there is a multiplication in the fast path.
>

Another idea - store page's order in the lower bits of page->address.
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