diff options
| -rw-r--r-- | mm/vmscan.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index cc422ad830d6..3783e45bfc92 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -6747,8 +6747,14 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int highest_zoneidx) /* * In defrag_mode, watermarks must be met in whole * blocks to avoid polluting allocator fallbacks. + * + * However, kswapd usually cannot accomplish this on + * its own and needs kcompactd support. Once it's + * reclaimed a compaction gap, and kswapd_shrink_node + * has dropped order, simply ensure there are enough + * base pages for compaction, wake kcompactd & sleep. */ - if (defrag_mode) + if (defrag_mode && order) item = NR_FREE_PAGES_BLOCKS; else item = NR_FREE_PAGES; |