[PATCH 4.19 85/98] mm, page_owner: handle THP splits correctly

From: Greg Kroah-Hartman
Date: Tue Aug 27 2019 - 03:58:38 EST

From: Vlastimil Babka <vbabka@xxxxxxx>

commit f7da677bc6e72033f0981b9d58b5c5d409fa641e upstream.

THP splitting path is missing the split_page_owner() call that
split_page() has.

As a result, split THP pages are wrongly reported in the page_owner file
as order-9 pages. Furthermore when the former head page is freed, the
remaining former tail pages are not listed in the page_owner file at
all. This patch fixes that by adding the split_page_owner() call into

Link: http://lkml.kernel.org/r/20190820131828.22684-2-vbabka@xxxxxxx
Fixes: a9627bc5e34e ("mm/page_owner: introduce split_page_owner and replace manual handling")
Reported-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

mm/huge_memory.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -33,6 +33,7 @@
#include <linux/page_idle.h>
#include <linux/shmem_fs.h>
#include <linux/oom.h>
+#include <linux/page_owner.h>

#include <asm/tlb.h>
#include <asm/pgalloc.h>
@@ -2477,6 +2478,9 @@ static void __split_huge_page(struct pag

+ split_page_owner(head, HPAGE_PMD_ORDER);
/* See comment in __split_huge_page_tail() */
if (PageAnon(head)) {
/* Additional pin to radix tree of swap cache */