linux-kernel - Re: [GIT PULL] Lockless SLUB slowpaths for v3.1-rc1

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Message-ID: <m2pqksznea.fsf@firstfloor.org>
Date:	Fri, 29 Jul 2011 16:18:37 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, rientjes@...gle.com, hughd@...gle.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [GIT PULL] Lockless SLUB slowpaths for v3.1-rc1

Christoph Lameter <cl@...ux.com> writes:

> On Fri, 29 Jul 2011, Pekka Enberg wrote:
>
>> We haven't come up with a solution to keep struct page size the same but I
>> think it's a reasonable trade-off.
>
> The change requires the page struct to be aligned to a double word
> boundary. 

Why is that?

> There is actually no variable added to the page struct. Its just
> the alignment requirement that causes padding to be added after each page
> struct.

These days with everyone using cgroups (and likely mcgroups too) 
you could probably put the cgroups page pointer back there. It's
currently external.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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