summaryrefslogtreecommitdiffstats
path: root/mm
diff options
context:
space:
mode:
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c39
1 files changed, 30 insertions, 9 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e4521ba1ddd0..68586c887611 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1656,7 +1656,6 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
u64 fraction[2], denominator;
enum lru_list lru;
- int noswap = 0;
bool force_scan = false;
struct zone *zone = lruvec_zone(lruvec);
@@ -1677,13 +1676,38 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
/* If we have no swap space, do not bother scanning anon pages. */
if (!sc->may_swap || (nr_swap_pages <= 0)) {
- noswap = 1;
fraction[0] = 0;
fraction[1] = 1;
denominator = 1;
goto out;
}
+ /*
+ * Global reclaim will swap to prevent OOM even with no
+ * swappiness, but memcg users want to use this knob to
+ * disable swapping for individual groups completely when
+ * using the memory controller's swap limit feature would be
+ * too expensive.
+ */
+ if (!global_reclaim(sc) && !vmscan_swappiness(sc)) {
+ fraction[0] = 0;
+ fraction[1] = 1;
+ denominator = 1;
+ goto out;
+ }
+
+ /*
+ * Do not apply any pressure balancing cleverness when the
+ * system is close to OOM, scan both anon and file equally
+ * (unless the swappiness setting disagrees with swapping).
+ */
+ if (!sc->priority && vmscan_swappiness(sc)) {
+ fraction[0] = 1;
+ fraction[1] = 1;
+ denominator = 1;
+ goto out;
+ }
+
anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
get_lru_size(lruvec, LRU_INACTIVE_ANON);
file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
@@ -1765,13 +1789,10 @@ out:
unsigned long scan;
size = get_lru_size(lruvec, lru);
- if (sc->priority || noswap || !vmscan_swappiness(sc)) {
- scan = size >> sc->priority;
- if (!scan && force_scan)
- scan = min(size, SWAP_CLUSTER_MAX);
- scan = div64_u64(scan * fraction[file], denominator);
- } else
- scan = size;
+ scan = size >> sc->priority;
+ if (!scan && force_scan)
+ scan = min(size, SWAP_CLUSTER_MAX);
+ scan = div64_u64(scan * fraction[file], denominator);
nr[lru] = scan;
}
}