Looks good. :-)
Thanks.
Acked-by: Yasunori Goto <[email protected]>
>
> The boot memory allocator makes assumptions on the alignment of zone
> boundaries even though the buddy allocator has no requirements on the
> alignment of zones. This may cause boot problems in situations where
> ZONE_MOVABLE is populated because the bootmem allocator assumes zones are
> at least order-log2(BITS_PER_LONG) aligned. As the two potential users
> (huge pages and memory hot-remove) of ZONE_MOVABLE would prefer a higher
> alignment, this patch aligns the start of the zone instead of fixing the
> different assumptions made by the bootmem allocator.
>
> This patch rounds the start of ZONE_MOVABLE in each node to a
> MAX_ORDER_NR_PAGES boundary. If the rounding pushes the start of ZONE_MOVABLE
> above the end of the node then the zone will contain no memory and will not
> be used at runtime. The value is rounded up instead of down as it is
> better to have the kernel-portion of memory larger than requested instead
> of smaller. The impact is that the kernel-usable portion of memory because a
> minimum guarantee instead of the exact size requested by the user.
>
>
> Signed-off-by: Mel Gorman <[email protected]>
> Acked-by: Andy Whitcroft <[email protected]>
> ---
>
> page_alloc.c | 5 +++++
> 1 files changed, 5 insertions(+)
>
> diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.21-rc6-mm1-002_commonparse/mm/page_alloc.c linux-2.6.21-rc6-mm1-003_alignmovable/mm/page_alloc.c
> --- linux-2.6.21-rc6-mm1-002_commonparse/mm/page_alloc.c 2007-04-24 09:38:30.000000000 +0100
> +++ linux-2.6.21-rc6-mm1-003_alignmovable/mm/page_alloc.c 2007-04-24 11:15:40.000000000 +0100
> @@ -3642,6 +3642,11 @@ restart:
> usable_nodes--;
> if (usable_nodes && required_kernelcore > usable_nodes)
> goto restart;
> +
> + /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */
> + for (nid = 0; nid < MAX_NUMNODES; nid++)
> + zone_movable_pfn[nid] =
> + roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES);
> }
>
> /**
--
Yasunori Goto
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