linux-kernel - Re: [PATCH v2 00/15] slab: overload struct slab over struct page to reduce memory usage

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Message-ID: <00000141c7d7ff58-44f388c4-da4a-4438-84a3-a2edb161b6a4-000000@email.amazonses.com>
Date:	Thu, 17 Oct 2013 19:15:23 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 00/15] slab: overload struct slab over struct page to
 reduce memory usage

On Wed, 16 Oct 2013, Andrew Morton wrote:

> This issue hasn't been well thought through.  Given a random struct
> page, there isn't any protocol to determine what it actually *is*.
> It's a plain old variant record, but it lacks the agreed-upon tag field
> which tells users which variant is currently in use.

This issue has bitten us when SLUB was first introduced. We found out the
hard way f.e. that the mapping field had meaning in various contexts for a
slab page.

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