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

[Nathan Lynch]

Yinghai Lu <yinghai at kernel.org> writes:
> please check
>
> [PATCH] x86: only clear node_states for 64bit
>
> Nathan reported that
> | commit 73d60b7f747176dbdff826c4127d22e1fd3f9f74
> | Author: Yinghai Lu <yinghai at kernel.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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