linux-kernel - Re: [PATCH 5/7] slub: Use end_token instead of NULL to terminate freelists

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Message-ID: <CAOJsxLFEMDwqGtSOBG-6Yjfk7NEzK9pQeTeGuzZFQ=F4Pqmx0Q@mail.gmail.com>
Date:	Wed, 10 Dec 2014 18:59:11 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	akpm <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>, iamjoonsoo@....com,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH 5/7] slub: Use end_token instead of NULL to terminate freelists

On Wed, Dec 10, 2014 at 6:30 PM, Christoph Lameter <cl@...ux.com> wrote:
> Ending a list with NULL means that the termination of a list is the same
> for all slab pages. The pointers of freelists otherwise always are
> pointing to the address space of the page. Make termination of a
> list possible by setting the lowest bit in the freelist address
> and use the start address of a page if no other address is available
> for list termination.
>
> This will allow us to determine the page struct address from a
> freelist pointer in the future.
>
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Reviewed-by: Pekka Enberg <penberg@...nel.org>
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