The patch titled
Subject: mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix
has been added to the -mm tree. Its filename is
mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix.patch
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------------------------------------------------------
From: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix
Fix 5.7-rc6-mm1 page migration crash in unmap_and_move(): when the
page to be migrated has been freed from under us, that is considered
a MIGRATEPAGE_SUCCESS, but no newpage has been allocated (and I don't
think it would ever need to be counted as a successful THP migration).
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2005210643340.482@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/migrate.c~mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix
+++ a/mm/migrate.c
@@ -1248,7 +1248,7 @@ out:
* we want to retry.
*/
if (rc == MIGRATEPAGE_SUCCESS) {
- if (PageTransHuge(newpage))
+ if (newpage && PageTransHuge(newpage))
thp_migration_success(true);
put_page(page);
if (reason == MR_MEMORY_FAILURE) {
_
Patches currently in -mm which might be from hughd@xxxxxxxxxx are
mm-vmstat-add-events-for-pmd-based-thp-migration-without-split-fix.patch
