This patch adds a special file /proc/sys/vm/compact_node. When a number is
written to this file, each zone in that node will be compacted.
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Andy Whitcroft <[email protected]>
---
include/linux/compaction.h | 7 +++++
kernel/sysctl.c | 13 +++++++++
mm/compaction.c | 54 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 74 insertions(+)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.22-rc4-mm2-110_compact_zone/include/linux/compaction.h linux-2.6.22-rc4-mm2-115_compact_viaproc/include/linux/compaction.h
--- linux-2.6.22-rc4-mm2-110_compact_zone/include/linux/compaction.h 2007-06-15 16:28:59.000000000 +0100
+++ linux-2.6.22-rc4-mm2-115_compact_viaproc/include/linux/compaction.h 2007-06-15 16:29:08.000000000 +0100
@@ -5,4 +5,11 @@
#define COMPACT_INCOMPLETE 0
#define COMPACT_COMPLETE 1
+#ifdef CONFIG_MIGRATION
+
+extern int sysctl_compaction_handler(struct ctl_table *table, int write,
+ struct file *file, void __user *buffer,
+ size_t *length, loff_t *ppos);
+
+#endif /* CONFIG_MIGRATION */
#endif /* _LINUX_COMPACTION_H */
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.22-rc4-mm2-110_compact_zone/kernel/sysctl.c linux-2.6.22-rc4-mm2-115_compact_viaproc/kernel/sysctl.c
--- linux-2.6.22-rc4-mm2-110_compact_zone/kernel/sysctl.c 2007-06-13 23:43:12.000000000 +0100
+++ linux-2.6.22-rc4-mm2-115_compact_viaproc/kernel/sysctl.c 2007-06-15 16:29:08.000000000 +0100
@@ -47,6 +47,7 @@
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
#include <linux/reboot.h>
+#include <linux/compaction.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
@@ -77,6 +78,7 @@ extern int printk_ratelimit_jiffies;
extern int printk_ratelimit_burst;
extern int pid_max_min, pid_max_max;
extern int sysctl_drop_caches;
+extern int sysctl_compact_node;
extern int percpu_pagelist_fraction;
extern int compat_log;
extern int maps_protect;
@@ -858,6 +860,17 @@ static ctl_table vm_table[] = {
.proc_handler = drop_caches_sysctl_handler,
.strategy = &sysctl_intvec,
},
+#ifdef CONFIG_MIGRATION
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "compact_node",
+ .data = &sysctl_compact_node,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = sysctl_compaction_handler,
+ .strategy = &sysctl_intvec,
+ },
+#endif /* CONFIG_MIGRATION */
{
.ctl_name = VM_MIN_FREE_KBYTES,
.procname = "min_free_kbytes",
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.22-rc4-mm2-110_compact_zone/mm/compaction.c linux-2.6.22-rc4-mm2-115_compact_viaproc/mm/compaction.c
--- linux-2.6.22-rc4-mm2-110_compact_zone/mm/compaction.c 2007-06-15 16:28:59.000000000 +0100
+++ linux-2.6.22-rc4-mm2-115_compact_viaproc/mm/compaction.c 2007-06-15 16:29:08.000000000 +0100
@@ -6,6 +6,8 @@
*/
#include <linux/migrate.h>
#include <linux/compaction.h>
+#include <linux/swap.h>
+#include <linux/sysctl.h>
#include "internal.h"
/*
@@ -295,3 +297,55 @@ static int compact_zone(struct zone *zon
return ret;
}
+
+/* Compact all zones within a node */
+int compact_node(int nodeid)
+{
+ int zoneid;
+ pg_data_t *pgdat;
+ struct zone *zone;
+
+ if (nodeid < 0 || nodeid > nr_node_ids || !node_online(nodeid))
+ return -EINVAL;
+ pgdat = NODE_DATA(nodeid);
+
+ /* Flush pending updates to the LRU lists */
+ lru_add_drain_all();
+
+ printk(KERN_INFO "Compacting memory in node %d\n", nodeid);
+ for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
+ struct compact_control cc;
+
+ zone = &pgdat->node_zones[zoneid];
+ if (!populated_zone(zone))
+ continue;
+
+ cc.nr_freepages = 0;
+ cc.nr_migratepages = 0;
+ INIT_LIST_HEAD(&cc.freepages);
+ INIT_LIST_HEAD(&cc.migratepages);
+
+ compact_zone(zone, &cc);
+
+ VM_BUG_ON(!list_empty(&cc.freepages));
+ VM_BUG_ON(!list_empty(&cc.migratepages));
+ }
+ printk(KERN_INFO "Compaction of node %d complete\n", nodeid);
+
+ return 0;
+}
+
+/* This is global and fierce ugly but it's straight-forward */
+int sysctl_compact_node;
+
+/* This is the entry point for compacting nodes via /proc/sys/vm */
+int sysctl_compaction_handler(struct ctl_table *table, int write,
+ struct file *file, void __user *buffer,
+ size_t *length, loff_t *ppos)
+{
+ proc_dointvec(table, write, file, buffer, length, ppos);
+ if (write)
+ return compact_node(sysctl_compact_node);
+
+ return 0;
+}
-
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