linux-kernel - Re: [RFC][PATCH 0/7] re-shrink 'struct page' when SLUB is on.

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Message-ID: <52B2424F.7050406@sr71.net>
Date:	Wed, 18 Dec 2013 16:48:15 -0800
From:	Dave Hansen <dave@...1.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Christoph Lameter <cl@...ux.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Pravin B Shelar <pshelar@...ira.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [RFC][PATCH 0/7] re-shrink 'struct page' when SLUB is on.

On 12/18/2013 04:41 PM, Andrew Morton wrote:
>> > Unless somebody can find some holes in this, I think we have no choice
>> > but to unset the HAVE_ALIGNED_STRUCT_PAGE config option and revert using
>> > the cmpxchg, at least for now.
>
> So your scary patch series which shrinks struct page while retaining
> the cmpxchg_double() might reclaim most of this loss?

That's what I'll test next, but I hope so.

The config tweak is important because it shows a low-risk way to get a
small 'struct page', plus get back some performance that we lost and
evidently never noticed.  A distro that was nearing a release might want
to go with this, for instance.
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