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-rw-r--r--mm/vmscan.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f51a33e..7e0f057 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2125,6 +2125,22 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
continue;
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
continue; /* Let kswapd poll it */
+ if (COMPACTION_BUILD) {
+ /*
+ * If we already have plenty of memory
+ * free for compaction, don't free any
+ * more. Even though compaction is
+ * invoked for any non-zero order,
+ * only frequent costly order
+ * reclamation is disruptive enough to
+ * become a noticable problem, like
+ * transparent huge page allocations.
+ */
+ if (sc->order > PAGE_ALLOC_COSTLY_ORDER &&
+ (compaction_suitable(zone, sc->order) ||
+ compaction_deferred(zone)))
+ continue;
+ }
/*
* This steals pages from memory cgroups over softlimit
* and returns the number of reclaimed pages and
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