path: root/mm/page_owner.c
diff options
authorJoonsoo Kim <>2015-07-17 16:24:18 -0700
committerLinus Torvalds <>2015-07-17 16:39:54 -0700
commite2cfc91120fa01e3458167054af993fb83d7d0ec (patch)
tree22ffd1c08779eb7ff49c313202cfe03492397c29 /mm/page_owner.c
parentf3a14ced32513d103a3ed0ce89c4e713fac01461 (diff)
mm/page_owner: set correct gfp_mask on page_owner
Currently, we set wrong gfp_mask to page_owner info in case of isolated freepage by compaction and split page. It causes incorrect mixed pageblock report that we can get from '/proc/pagetypeinfo'. This metric is really useful to measure fragmentation effect so should be accurate. This patch fixes it by setting correct information. Without this patch, after kernel build workload is finished, number of mixed pageblock is 112 among roughly 210 movable pageblocks. But, with this fix, output shows that mixed pageblock is just 57. Signed-off-by: Joonsoo Kim <> Cc: Mel Gorman <> Cc: Vlastimil Babka <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/page_owner.c')
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/page_owner.c b/mm/page_owner.c
index bd5f842b56d2..983c3a10fa07 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -76,6 +76,13 @@ void __set_page_owner(struct page *page, unsigned int order, gfp_t gfp_mask)
__set_bit(PAGE_EXT_OWNER, &page_ext->flags);
+gfp_t __get_page_owner_gfp(struct page *page)
+ struct page_ext *page_ext = lookup_page_ext(page);
+ return page_ext->gfp_mask;
static ssize_t
print_page_owner(char __user *buf, size_t count, unsigned long pfn,
struct page *page, struct page_ext *page_ext)