linux-kernel - Re: [BUGFIX] set_mempolicy(MPOL_INTERLEAV) N_HIGH

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Date:	Tue, 28 Jul 2009 10:52:10 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.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>,
	David Rientjes <rientjes@...gle.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUGFIX] set_mempolicy(MPOL_INTERLEAV) N_HIGH_MEMORY aware

KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:

> tested on x86-64/fake NUMA and ia64/NUMA.
> (That ia64 is a host which orignal bug report used.)
>
> Maybe this is bigger patch than expected, but NODEMASK_ALLOC() will be a way
> to go, anyway. (even if CPUMASK_ALLOC is not used anyware yet..)
> Kosaki tested this on ia64 NUMA. thanks.

Note that low/high memory support in NUMA policy is only partial
anyways, e.g. the VMA based policy only supports a single zone. That
was by design choice and because NUMA has a lot of issues on 32bit due
to the limited address space and is not widely used.

So small fixes are ok but I wouldn't go to large effort to fix NUMA
policy on 32bit.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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