The patch titled
Subject: mm, page_owner: handle THP splits correctly
has been added to the -mm tree. Its filename is
mm-page_owner-handle-thp-splits-correctly.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_owner-handle-thp-splits-correctly.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_owner-handle-thp-splits-correctly.patch
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From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, page_owner: handle THP splits correctly
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 __split_huge_page().
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>
---
mm/huge_memory.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/huge_memory.c~mm-page_owner-handle-thp-splits-correctly
+++ a/mm/huge_memory.c
@@ -32,6 +32,7 @@
#include <linux/shmem_fs.h>
#include <linux/oom.h>
#include <linux/numa.h>
+#include <linux/page_owner.h>
#include <asm/tlb.h>
#include <asm/pgalloc.h>
@@ -2516,6 +2517,9 @@ static void __split_huge_page(struct pag
}
ClearPageCompound(head);
+
+ split_page_owner(head, HPAGE_PMD_ORDER);
+
/* See comment in __split_huge_page_tail() */
if (PageAnon(head)) {
/* Additional pin to swap cache */
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-page_owner-handle-thp-splits-correctly.patch
mm-page_owner-record-page-owner-for-each-subpage.patch
mm-page_owner-keep-owner-info-when-freeing-the-page.patch
mm-page_owner-debug_pagealloc-save-and-dump-freeing-stack-trace.patch
mm-compaction-clear-total_migratefree_scanned-before-scanning-a-new-zone-fix-2.patch
mm-reclaim-cleanup-should_continue_reclaim.patch
mm-compaction-raise-compaction-priority-after-it-withdrawns.patch
