Commit b25bb608 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] vmscan: zone pressure calculation fix

Off-by-one in balance_pgdat(): `priority' can never go negative.  It causes
the scanning priority thresholds to be quite wrong and kswapd tends to go
berzerk when there is a lot of mapped memory around.
parent 322bb616
......@@ -989,7 +989,7 @@ static int balance_pgdat(pg_data_t *pgdat, int nr_pages, struct page_state *ps)
if (to_free > 0)
blk_congestion_wait(WRITE, HZ/10);
}
if (priority < 0) {
if (priority <= 0) {
for (i = 0; i < pgdat->nr_zones; i++) {
struct zone *zone = pgdat->node_zones + i;
......
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