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Date: Tue, 16 Dec 2014 19:33:15 +0400
Message-ID: <CAPAsAGxVaucq5yOWiMztL4MGwpKGbC=WuhWFagXQ0UtWtPoqbw@mail.gmail.com>
Subject: Re: [PATCH 3/7] slub: Do not use c->page on free
From: Andrey Ryabinin <ryabinin.a.a@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>, akpm@linuxfoundation.org,
        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>,
        Jesper Dangaard Brouer <brouer@redhat.com>
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org

2014-12-16 17:53 GMT+03:00 Christoph Lameter <cl@linux.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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