From: Miaohe Lin Subject: mm: compaction: clean up comment about async compaction in isolate_migratepages Since commit 282722b0d258 ("mm, compaction: restrict async compaction to pageblocks of same migratetype"), async direct compaction is restricted to scan the pageblocks of same migratetype. Correct the comment accordingly. Link: https://lkml.kernel.org/r/20220418141253.24298-9-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Cc: Charan Teja Kalla Cc: David Hildenbrand Cc: Pintu Kumar Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/compaction.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/mm/compaction.c~mm-compaction-clean-up-comment-about-async-compaction-in-isolate_migratepages +++ a/mm/compaction.c @@ -1941,12 +1941,12 @@ static isolate_migrate_t isolate_migrate continue; /* - * For async compaction, also only scan in MOVABLE blocks - * without huge pages. Async compaction is optimistic to see - * if the minimum amount of work satisfies the allocation. - * The cached PFN is updated as it's possible that all - * remaining blocks between source and target are unsuitable - * and the compaction scanners fail to meet. + * For async direct compaction, only scan the pageblocks of the + * same migratetype without huge pages. Async direct compaction + * is optimistic to see if the minimum amount of work satisfies + * the allocation. The cached PFN is updated as it's possible + * that all remaining blocks between source and target are + * unsuitable and the compaction scanners fail to meet. */ if (!suitable_migration_source(cc, page)) { update_cached_migrate(cc, block_end_pfn); _