linux-kernel - Re: [PATCH 07/16] slab: overloading the RCU head over the LRU for RCU free

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Message-ID: <000001410d765d3a-0f3f8df2-dccb-455a-a929-f1fd018700d2-000000@email.amazonses.com>
Date:	Wed, 11 Sep 2013 14:39:22 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/16] slab: overloading the RCU head over the LRU for
 RCU free

On Thu, 22 Aug 2013, Joonsoo Kim wrote:

> With build-time size checking, we can overload the RCU head over the LRU
> of struct page to free pages of a slab in rcu context. This really help to
> implement to overload the struct slab over the struct page and this
> eventually reduce memory usage and cache footprint of the SLAB.

Looks fine to me. Can you add the rcu_head to the struct page union? This
kind of overload is used frequently elsewhere as well. Then cleanup other
cases of such uses (such as in SLUB).

Acked-by: Christoph Lameter <cl@...ux.com>

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