[PATCH] vmscan: initialize zone->{prev,temp}_priority

From: Nikita Danilov <Nikita@Namesys.COM>

This patch initializes zone->{prev,temp}_priority to DEF_PRIORITY.
Otherwise they are left zeroed, and first run of VM scanner thinks that
zones are under enormous stress.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9fa4ffb2675c..66cbaa36d878 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -166,6 +166,13 @@ struct zone {
 #define GFP_ZONEMASK	0x03
 
 /*
+ * The "priority" of VM scanning is how much of the queues we will scan in one
+ * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
+ * queues ("queue_length >> 12") during an aging round.
+ */
+#define DEF_PRIORITY 12
+
+/*
  * One allocation request operates on a zonelist. A zonelist
  * is a list of zones, the first one is the 'goal' of the
  * allocation, the other zones are fallback zones, in decreasing