diff options
| -rw-r--r-- | mm/vmscan.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 5daf606e0a3..b07c48b09a9 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1867,6 +1867,23 @@ out: try_to_freeze(); + /* + * Fragmentation may mean that the system cannot be + * rebalanced for high-order allocations in all zones. + * At this point, if nr_reclaimed < SWAP_CLUSTER_MAX, + * it means the zones have been fully scanned and are still + * not balanced. For high-order allocations, there is + * little point trying all over again as kswapd may + * infinite loop. + * + * Instead, recheck all watermarks at order-0 as they + * are the most important. If watermarks are ok, kswapd will go + * back to sleep. High-order users can still perform direct + * reclaim if they wish. + */ + if (sc.nr_reclaimed < SWAP_CLUSTER_MAX) + order = sc.order = 0; + goto loop_again; } |