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mm/compaction: correct comment of fast_find_migrateblock in isolate_migratepages 

After 90ed667c03 ("Revert "Revert "mm/compaction: fix set skip in
fast_find_migrateblock"""), we remove skip set in fast_find_migrateblock. 
Correct comment that fast_find_block is used to avoid isolation_suitable
check for pageblock returned from fast_find_migrateblock because
fast_find_migrateblock will mark found pageblock skipped.

Instead, comment that fast_find_block is used to avoid a redundant check
of fast found pageblock which is already checked skip flag inside
fast_find_migrateblock.

Link: https://lkml.kernel.org/r/20230804110454.2935878-5-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-08-04 19:04:50 +08:00 committed by Andrew Morton
parent 7545e2f20a
commit 0aa8ea3c5d
1 changed files with 3 additions and 3 deletions
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6
mm/compaction.c
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@ -1987,9 +1987,9 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
block_start_pfn = cc->zone->zone_start_pfn;
/*
* fast_find_migrateblock marks a pageblock skipped so to avoid
* the isolation_suitable check below, check whether the fast
* search was successful.
* fast_find_migrateblock() has already ensured the pageblock is not
* set with a skipped flag, so to avoid the isolation_suitable check
* below again, check whether the fast search was successful.
*/
fast_find_block = low_pfn != cc->migrate_pfn && !cc->fast_search_fail;