Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=46dafbca2bba811665b01d8cedf911204820623c
Commit: 46dafbca2bba811665b01d8cedf911204820623c
Parent: 5adc5be7cd1bcef6bb64f5255d2a33f20a3cf5be
Author: Mel Gorman <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 01:25:55 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 09:43:00 2007 -0700
Be more agressive about stealing when MIGRATE_RECLAIMABLE allocations
fallback
MIGRATE_RECLAIMABLE allocations tend to be very bursty in nature like when
updatedb starts. It is likely this will occur in situations where MAX_ORDER
blocks of pages are not free. This means that updatedb can scatter
MIGRATE_RECLAIMABLE pages throughout the address space. This patch is more
agressive about stealing blocks of pages for MIGRATE_RECLAIMABLE.
Signed-off-by: Mel Gorman <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
mm/page_alloc.c | 18 +++++++++++++++---
1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e1d87ee..b864584 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -821,11 +821,23 @@ retry:
/*
* If breaking a large block of pages, move all free
- * pages to the preferred allocation list
+ * pages to the preferred allocation list. If falling
+ * back for a reclaimable kernel allocation, be more
+ * agressive about taking ownership of free pages
*/
- if (unlikely(current_order >= MAX_ORDER / 2)) {
+ if (unlikely(current_order >= MAX_ORDER / 2) ||
+ start_migratetype ==
MIGRATE_RECLAIMABLE) {
+ unsigned long pages;
+ pages = move_freepages_block(zone, page,
+
start_migratetype);
+
+ /* Claim the whole block if over half of it is
free */
+ if ((pages << current_order) >= (1 <<
(MAX_ORDER-2)) &&
+ migratetype !=
MIGRATE_HIGHATOMIC)
+ set_pageblock_migratetype(page,
+
start_migratetype);
+
migratetype = start_migratetype;
- move_freepages_block(zone, page, migratetype);
}
/* Remove the page from the freelists */
-
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