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mm/hugetlb: filter out hugetlb pages if HUGEPAGE migration is not supported.

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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;
	}

Fix this by checking hugepage_migration_supported both in
has_unmovable_pages which is the primary backoff mechanism for page
offlining and for consistency reasons also into scan_movable_pages
because it doesn't make any sense to return a pfn to non-migrateable
huge page.

This issue was revealed by, but not caused by 72b39cfc4d ("mm,
memory_hotplug: do not fail offlining too early").

Link: http://lkml.kernel.org/r/20180824063314.21981-1-aneesh.kumar@linux.ibm.com
Fixes: 72b39cfc4d ("mm, memory_hotplug: do not fail offlining too early")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reported-by: Haren Myneni <haren@linux.vnet.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V 2018-09-04 15:45:59 -07:00 committed by Linus Torvalds
parent 04b8e94607
commit 464c7ffbcb
2 changed files with 6 additions and 1 deletions
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3
mm/memory_hotplug.c
View File

@ -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,

4
mm/page_alloc.c
View File

@ -7708,6 +7708,10 @@ 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;
}