+static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc,
+ bool sync)
+{
+ enum lumpy_mode mode = sync ? LUMPY_MODE_SYNC : LUMPY_MODE_ASYNC;
+
+ /*
+ * Some reclaim have alredy been failed. No worth to try synchronous
+ * lumpy reclaim.
+ */
+ if (sync && sc->lumpy_reclaim_mode == LUMPY_MODE_NONE)
+ return;
+
+ /*
+ * If we need a large contiguous chunk of memory, or have
+ * trouble getting a small set of contiguous pages, we
+ * will reclaim both active and inactive pages.
+ */
+ if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
+ sc->lumpy_reclaim_mode = mode;
+ else if (sc->order && priority < DEF_PRIORITY - 2)
+ sc->lumpy_reclaim_mode = mode;
+ else
+ sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+}
+
+static void disable_lumpy_reclaim_mode(struct scan_control *sc)
+{
+ sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+}
+