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-rw-r--r--mm/vmscan.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8ce39867140b..e54c882d6789 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -97,8 +97,13 @@ struct scan_control {
/* Can pages be swapped as part of reclaim? */
unsigned int may_swap:1;
- /* Can cgroups be reclaimed below their normal consumption range? */
- unsigned int may_thrash:1;
+ /*
+ * Cgroups are not reclaimed below their configured memory.low,
+ * unless we threaten to OOM. If any cgroups are skipped due to
+ * memory.low and nothing was reclaimed, go back for memory.low.
+ */
+ unsigned int memcg_low_reclaim:1;
+ unsigned int memcg_low_skipped:1;
unsigned int hibernation_mode:1;
@@ -2512,8 +2517,10 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
unsigned long scanned;
if (mem_cgroup_low(root, memcg)) {
- if (!sc->may_thrash)
+ if (!sc->memcg_low_reclaim) {
+ sc->memcg_low_skipped = 1;
continue;
+ }
mem_cgroup_events(memcg, MEMCG_LOW, 1);
}
@@ -2768,9 +2775,10 @@ retry:
return 1;
/* Untapped cgroup reserves? Don't OOM, retry. */
- if (!sc->may_thrash) {
+ if (sc->memcg_low_skipped) {
sc->priority = initial_priority;
- sc->may_thrash = 1;
+ sc->memcg_low_reclaim = 1;
+ sc->memcg_low_skipped = 0;
goto retry;
}