linux-kernel - Re: [PATCH] mm: clear N_HIGH_MEMORY map before se set it again -v4

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Date:	Sun, 21 Jun 2009 23:39:56 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	mel@....ul.ie, tglx@...utronix.de, hpa@...or.com,
	suresh.b.siddha@...el.com, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, rusty@...tcorp.com.au, steiner@....com,
	rientjes@...gle.com, containers@...ts.linux-foundation.org
Subject: Re: [PATCH] mm: clear N_HIGH_MEMORY map before se set it again -v4

Yinghai Lu <yinghai@...nel.org> writes:
> please check
>
> [PATCH] x86: only clear node_states for 64bit
>
> Nathan reported that
> | commit 73d60b7f747176dbdff826c4127d22e1fd3f9f74
> | Author: Yinghai Lu <yinghai@...nel.org>
> | Date:   Tue Jun 16 15:33:00 2009 -0700
> |
> |    page-allocator: clear N_HIGH_MEMORY map before we set it again
> |    
> |    SRAT tables may contains nodes of very small size.  The arch code may
> |    decide to not activate such a node.  However, currently the early boot
> |    code sets N_HIGH_MEMORY for such nodes.  These nodes therefore seem to be
> |    active although these nodes have no present pages.
> |    
> |    For 64bit N_HIGH_MEMORY == N_NORMAL_MEMORY, so that works for 64 bit too
>
> the cpuset.mems cgroup attribute on an i386 kvm guest
>
> try to fix it by only clear node_states[N_NORMAL_MEMORY] for 64bit only.
> and need to do save/restore for that in find_zone_movable_pfn

This works for my setup, thanks.
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