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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:26:01 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:00 -0700
commitd9c2340052278d8eb2ffb16b0484f8f794def4de (patch)
treeaec7e4e11473a4fcdfd389c718544780a042c6df /include/linux/mmzone.h
parentd100313fd615cc30374ff92e0b3facb053838330 (diff)
downloadop-kernel-dev-d9c2340052278d8eb2ffb16b0484f8f794def4de.zip
op-kernel-dev-d9c2340052278d8eb2ffb16b0484f8f794def4de.tar.gz
Do not depend on MAX_ORDER when grouping pages by mobility
Currently mobility grouping works at the MAX_ORDER_NR_PAGES level. This makes sense for the majority of users where this is also the huge page size. However, on platforms like ia64 where the huge page size is runtime configurable it is desirable to group at a lower order. On x86_64 and occasionally on x86, the hugepage size may not always be MAX_ORDER_NR_PAGES. This patch groups pages together based on the value of HUGETLB_PAGE_ORDER. It uses a compile-time constant if possible and a variable where the huge page size is runtime configurable. It is assumed that grouping should be done at the lowest sensible order and that the user would not want to override this. If this is not true, page_block order could be forced to a variable initialised via a boot-time kernel parameter. One potential issue with this patch is that IA64 now parses hugepagesz with early_param() instead of __setup(). __setup() is called after the memory allocator has been initialised and the pageblock bitmaps already setup. In tests on one IA64 there did not seem to be any problem with using early_param() and in fact may be more correct as it guarantees the parameter is handled before the parsing of hugepages=. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index fef08c6..87a4045 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -235,7 +235,7 @@ struct zone {
#ifndef CONFIG_SPARSEMEM
/*
- * Flags for a MAX_ORDER_NR_PAGES block. See pageblock-flags.h.
+ * Flags for a pageblock_nr_pages block. See pageblock-flags.h.
* In SPARSEMEM, this map is stored in struct mem_section
*/
unsigned long *pageblock_flags;
@@ -740,7 +740,7 @@ extern struct zone *next_zone(struct zone *zone);
#define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1))
#define SECTION_BLOCKFLAGS_BITS \
- ((1 << (PFN_SECTION_SHIFT - (MAX_ORDER-1))) * NR_PAGEBLOCK_BITS)
+ ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
#error Allocator MAX_ORDER exceeds SECTION_SIZE
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