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Date: Thu, 2 Aug 2012 11:04:46 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [RFC PATCH 14/23 V2] slub, hotplug: ignore unrelated node's
 hot-adding and hot-removing
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To: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>, Paul Menage <paul@paulmenage.org>, Rob Landley <rob@landley.net>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Balbir Singh <bsingharora@gmail.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>, Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>, Jarkko Sakkinen <jarkko.sakkinen@intel.com>, Matt Fleming <matt.fleming@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Yinghai Lu <yinghai@kernel.org>, David Rientjes <rientjes@google.com>, Bjorn Helgaas <bhelgaas@google.com>, Wanlong Gao <gaowanlong@cn.fujitsu.com>, Petr Holasek <pholasek@redhat.com>, Djalal Harouni <tixxdz@opendz.org>, Jiri Kosina <jkosina@suse.cz>, Laura Vasilescu <laura@rosedu.org>, WANG Cong <xiyou.wangcong@gmail.com>, Hugh Dickins <hughd@google.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Konstantin Khlebnikov <khlebnikov@openvz.org>, Sam Ravnborg <sam@ravnborg.org>, Paul Gortmaker <paul.gortmaker@windriver.com>, Rusty Russell <rusty@rustcorp.com.au>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Jim Cromie <jim.cromie@gmail.com>, Pawel Moll <pawel.moll@arm.com>, Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>, Oleg Nesterov <oleg@redhat.com>, Dan Magenheimer <dan.magenheimer@oracle.com>, Michal Nazarewicz <mina86@mina86.com>, Mel Gorman <mgorman@suse.de>, Hillf Danton <dhillf@gmail.com>, Gavin Shan <shangw@linux.vnet.ibm.com>, Wen Congyang <wency@cn.fujitsu.com>, Rik van Riel <riel@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Wang Sheng-Hui <shhuiw@gmail.com>, Minchan Kim <minchan@kernel.org>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, containers@lists.linux-foundation.org

On Thu, 2 Aug 2012, Lai Jiangshan wrote:

> SLUB only fucus on the nodes which has normal memory, so ignore the other
> node's hot-adding and hot-removing.

You would need to do the same for SLAB. SLAB has an easier time with
falling back to other nodes (and therefore does not show up in your
tests) but as a result SLAB will be quite ineffective
because it created bogus structures that are never used yet constantly
traversed.

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