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mm: compaction: clean up comment about async compaction in isolate_migratepages 

Since commit 282722b0d2 ("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 <linmiaohe@huawei.com>
Cc: Charan Teja Kalla <charante@codeaurora.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Pintu Kumar <pintu@codeaurora.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-04-28 23:16:18 -07:00 committed by akpm
parent 66fe1cf7f5
commit 556162bf3a
1 changed files with 6 additions and 6 deletions
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12
mm/compaction.c
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@ -1941,12 +1941,12 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
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);