In kswapd recycling shrink, high watermark is fixed, meaning the
nr_to_reclaim value is fixed, so there is no need to repeatedly
calculate the nr_to_reclaim value during each iteraton.
Signed-off-by: Zhiguo Jiang <[email protected]>
---
mm/vmscan.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
mode change 100644 => 100755 mm/vmscan.c
diff --git a/mm/vmscan.c b/mm/vmscan.c
index a4e44f1c97c1..1aab3549969e
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -6638,7 +6638,9 @@ static bool kswapd_shrink_node(pg_data_t *pgdat,
int z;
/* Reclaim a number of pages proportional to the number of zones */
- sc->nr_to_reclaim = 0;
+ if (sc->nr_to_reclaim > 0)
+ goto shrink;
+
for (z = 0; z <= sc->reclaim_idx; z++) {
zone = pgdat->node_zones + z;
if (!managed_zone(zone))
@@ -6647,6 +6649,7 @@ static bool kswapd_shrink_node(pg_data_t *pgdat,
sc->nr_to_reclaim += max(high_wmark_pages(zone), SWAP_CLUSTER_MAX);
}
+shrink:
/*
* Historically care was taken to put equal pressure on all zones but
* now pressure is applied based on node LRU order.
@@ -6725,6 +6728,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int highest_zoneidx)
.gfp_mask = GFP_KERNEL,
.order = order,
.may_unmap = 1,
+ .nr_to_reclaim = 0,
};
set_task_reclaim_state(current, &sc.reclaim_state);
--
2.39.0