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

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Message-ID: <20130912065549.GC8055@lge.com>
Date:	Thu, 12 Sep 2013 15:55:49 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 Wed, Sep 11, 2013 at 02:39:22PM +0000, Christoph Lameter wrote:
> 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).

Okay. But I will implement it seprately because I don't know where the cases
are now and some inverstigation would be needed.

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

Thanks!
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