When scanning for movable pages, filter out Hugetlb pages if hugepage migration
is not supported. Without this we hit infinte loop in __offline pages where we
do
pfn = scan_movable_pages(start_pfn, end_pfn);
if (pfn) { /* We have movable pages */
ret = do_migrate_range(pfn, end_pfn);
goto repeat;
}
We do support hugetlb migration ony if the hugetlb pages are at pmd level. Here
we just check for Kernel config. The gigantic page size check is done in
page_huge_active.
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reported-by: Haren Myneni <haren@xxxxxxxxxxxxxxxxxx>
CC: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 3 ++-
mm/page_alloc.c | 4 ++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9eea6e809a4e..38d94b703e9d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1333,7 +1333,8 @@ static unsigned long scan_movable_pages(unsigned long start, unsigned long end)
if (__PageMovable(page))
return pfn;
if (PageHuge(page)) {
- if (page_huge_active(page))
+ if (hugepage_migration_supported(page_hstate(page)) &&
+ page_huge_active(page))
return pfn;
else
pfn = round_up(pfn + 1,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c677c1506d73..b8d91f59b836 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7709,6 +7709,10 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
* handle each tail page individually in migration.
*/
if (PageHuge(page)) {
+
+ if (!hugepage_migration_supported(page_hstate(page)))
+ goto unmovable;
+
iter = round_up(iter + 1, 1<<compound_order(page)) - 1;
continue;
}
--
2.17.1
