On Sun 17-03-13 13:04:07, Mel Gorman wrote:
[...]
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 88c5fed..4835a7a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2593,6 +2593,32 @@ static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, long remaining,
}
/*
+ * kswapd shrinks the zone by the number of pages required to reach
+ * the high watermark.
+ */
+static void kswapd_shrink_zone(struct zone *zone,
+ struct scan_control *sc,
+ unsigned long lru_pages)
+{
+ unsigned long nr_slab;
+ struct reclaim_state *reclaim_state = current->reclaim_state;
+ struct shrink_control shrink = {
+ .gfp_mask = sc->gfp_mask,
+ };
+
+ /* Reclaim above the high watermark. */
+ sc->nr_to_reclaim = max(SWAP_CLUSTER_MAX, high_wmark_pages(zone));
OK, so the cap is at high watermark which sounds OK to me, although I
would expect balance_gap being considered here. Is it not used
intentionally or you just wanted to have a reasonable upper bound?
I am not objecting to that it just hit my eyes.