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mm/compaction: improve comment of is_via_compact_memory

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We do proactive compaction with order == -1 via
1. /proc/sys/vm/compact_memory
2. /sys/devices/system/node/nodex/compact
3. /proc/sys/vm/compaction_proactiveness
Add missed situation in which order == -1.

Link: https://lkml.kernel.org/r/20230901155141.249860-6-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-09-01 23:51:40 +08:00 committed by Andrew Morton
parent 8df4e28c64
commit 9cc17ede51
1 changed files with 4 additions and 2 deletions
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6
mm/compaction.c
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@ -2065,8 +2065,10 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
}
/*
* order == -1 is expected when compacting via
* /proc/sys/vm/compact_memory
* order == -1 is expected when compacting proactively via
* 1. /proc/sys/vm/compact_memory
* 2. /sys/devices/system/node/nodex/compact
* 3. /proc/sys/vm/compaction_proactiveness
*/
static inline bool is_via_compact_memory(int order)
{