linux-kernel - RE: [PATCH] mm/slub: fix a BUG_ON() when offlining a memory node and CONFIG_SLUB

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Message-ID: <alpine.DEB.2.00.1207181029480.22907@router.home>
Date:	Wed, 18 Jul 2012 10:30:05 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Luck, Tony" <tony.luck@...el.com>
cc:	Jiang Liu <liuj97@...il.com>, Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mgorman@...e.de>,
	Jianguo Wu <wujianguo@...wei.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Keping Chen <chenkeping@...wei.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mm/slub: fix a BUG_ON() when offlining a memory node
 and CONFIG_SLUB_DEBUG is on

On Tue, 17 Jul 2012, Luck, Tony wrote:

> > This suggests that a call to early_kmem_cache_node_alloc was not needed
> > because the per node structure already existed. Lets fix that instead.
>
> Perhaps by just having one API for users to call? It seems odd to force users
> to figure out whether they are called before some magic time during boot
> and use the "early...()" call. Shouldn't we hide this sort of detail from them?

The early_ calls are internal to the allocator and not exposed to the
user.
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