linux-kernel - Re: CONFIG_SLUB/USE_SPLIT

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Message-ID: <525D8106.9020304@zankel.net>
Date:	Tue, 15 Oct 2013 10:53:10 -0700
From:	Chris Zankel <chris@...kel.net>
To:	Max Filippov <jcmvbkbc@...il.com>
CC:	"Kirill A. Shutemov" <kirill@...temov.name>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>
Subject: Re: CONFIG_SLUB/USE_SPLIT_PTLOCKS compatibility

On 10/14/2013 04:49 AM, Max Filippov wrote:
> Buddy allocator was used here prior to commit 6656920 [XTENSA] Add
> support for cache-aliasing I can only guess that the change was made
> to make allocated page tables have the same colour, but am not sure
> why this is needed. Chris? 
Max, I think you are right that in an earlier attempt to support cache
aliasing, we tried to allocate pages with the correct 'color', and
cached pages locally (if I remember correctly). The approach we use now
doesn't require that so the suggested patches are fine. (Note that cache
aliasing support hasn't been committed to mainline yet)

Thanks,
-Chris

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