linux-kernel - Re: [BUG] set_mempolicy(MPOL_INTERLEAV) cause kernel panic

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Message-ID: <alpine.DEB.2.00.0907170158050.13151@chino.kir.corp.google.com>
Date:	Fri, 17 Jul 2009 02:01:41 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Miao Xie <miaox@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUG] set_mempolicy(MPOL_INTERLEAV) cause kernel panic

On Fri, 17 Jul 2009, KOSAKI Motohiro wrote:

> This patch seems band-aid patch. it will change memory-hotplug behavior.
> Please imazine following scenario:
> 
> 1. numactl interleave=all process-A
> 2. memory hot-add
> 
> before 2.6.30:
> 		-> process-A can use hot-added memory
> 

That apparently depends on the architecture since Lee said top_cpuset 
reflects node_possible_map on ia64 and node_online_map on x86_64.
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