From: Vlastimil Babka vbabka@suse.cz
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 __split_huge_page().
Link: http://lkml.kernel.org/r/20190820131828.22684-2-vbabka@suse.cz Fixes: a9627bc5e34e ("mm/page_owner: introduce split_page_owner and replace manual handling") Reported-by: Kirill A. Shutemov kirill@shutemov.name Signed-off-by: Vlastimil Babka vbabka@suse.cz Cc: Michal Hocko mhocko@kernel.org Cc: Mel Gorman mgorman@techsingularity.net Cc: Matthew Wilcox willy@infradead.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- mm/huge_memory.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -30,6 +30,7 @@ #include <linux/userfaultfd_k.h> #include <linux/page_idle.h> #include <linux/shmem_fs.h> +#include <linux/page_owner.h>
#include <asm/tlb.h> #include <asm/pgalloc.h> @@ -1950,6 +1951,9 @@ 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)) { page_ref_inc(head);