[PATCH 01 of 66] disable lumpy when compaction is enabled

[Andrea Arcangeli]

From: Andrea Arcangeli <aarcange@xxxxxxxxxx>

Compaction is more reliable than lumpy, and lumpy makes the system unusable
when it runs.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -274,6 +274,7 @@ unsigned long shrink_slab(unsigned long 
 static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc,
 				   bool sync)
 {
+#ifndef CONFIG_COMPACTION
 	enum lumpy_mode mode = sync ? LUMPY_MODE_SYNC : LUMPY_MODE_ASYNC;
 
 	/*
@@ -294,11 +295,14 @@ static void set_lumpy_reclaim_mode(int p
 		sc->lumpy_reclaim_mode = mode;
 	else
 		sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+#endif
 }
 
 static void disable_lumpy_reclaim_mode(struct scan_control *sc)
 {
+#ifndef CONFIG_COMPACTION
 	sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+#endif
 }
 
 static inline int is_page_cache_freeable(struct page *page)
@@ -321,9 +325,11 @@ static int may_write_to_queue(struct bac
 	if (bdi == current->backing_dev_info)
 		return 1;
 
+#ifndef CONFIG_COMPACTION
 	/* lumpy reclaim for hugepage often need a lot of write */
 	if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
 		return 1;
+#endif
 	return 0;
 }
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/