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.
---
include/linux/mmzone.h | 7 +++++++
mm/page_alloc.c | 2 ++
mm/vmscan.c | 7 -------
3 files changed, 9 insertions(+), 7 deletions(-)
diff -puN include/linux/mmzone.h~init-zone-priorities include/linux/mmzone.h
--- 25/include/linux/mmzone.h~init-zone-priorities 2004-01-09 10:58:09.000000000 -0800
+++ 25-akpm/include/linux/mmzone.h 2004-01-09 10:58:09.000000000 -0800
@@ -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
diff -puN mm/page_alloc.c~init-zone-priorities mm/page_alloc.c
--- 25/mm/page_alloc.c~init-zone-priorities 2004-01-09 10:58:09.000000000 -0800
+++ 25-akpm/mm/page_alloc.c 2004-01-09 10:58:09.000000000 -0800
@@ -1266,6 +1266,8 @@ static void __init free_area_init_core(s
zone->zone_pgdat = pgdat;
zone->free_pages = 0;
+ zone->temp_priority = zone->prev_priority = DEF_PRIORITY;
+
/*
* The per-cpu-pages pools are set to around 1000th of the
* size of the zone. But no more than 1/4 of a meg - there's
diff -puN mm/vmscan.c~init-zone-priorities mm/vmscan.c
--- 25/mm/vmscan.c~init-zone-priorities 2004-01-09 10:58:09.000000000 -0800
+++ 25-akpm/mm/vmscan.c 2004-01-09 10:58:09.000000000 -0800
@@ -38,13 +38,6 @@
#include <linux/swapops.h>
/*
- * 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
-
-/*
* From 0 .. 100. Higher means more swappy.
*/
int vm_swappiness = 60;
_