Fix calculation in move_freepages_block for counting pages
move_freepages_block() returns the number of blocks moved. This value is used
to determine if a block of pages should be stolen for the exclusive use of a
migrate type or not. However, the value returned is being used correctly.
This patch fixes the calculation to return the number of base pages that have
been moved.
This should be considered a fix to the patch
move-free-pages-between-lists-on-steal.patch
Credit to Andy Whitcroft for spotting the problem.
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>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ac8fc51..942498f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -718,7 +718,7 @@
{
struct page *page;
unsigned long order;
- int blocks_moved = 0;
+ int pages_moved = 0;
#ifndef CONFIG_HOLES_IN_ZONE
/*
@@ -747,10 +747,10 @@
list_add(&page->lru,
&zone->free_area[order].free_list[migratetype]);
page += 1 << order;
- blocks_moved++;
+ pages_moved += 1 << order;
}
- return blocks_moved;
+ return pages_moved;
}
int move_freepages_block(struct zone *zone, struct page *page, int migratetype)
@@ -833,7 +833,7 @@
start_migratetype);
/* Claim the whole block if over half of it is free */
- if ((pages << current_order) >= (1 << (MAX_ORDER-2)))
+ if (pages >= (1 << (MAX_ORDER-2)))
set_pageblock_migratetype(page,
start_migratetype);