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mm: compaction: add /proc trigger for memory compaction

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Add a proc file /proc/sys/vm/compact_memory.  When an arbitrary value is
written to the file, all zones are compacted.  The expected user of such a
trigger is a job scheduler that prepares the system before the target
application runs.

Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2010-05-24 14:32:28 -07:00 • committed by Linus Torvalds
commit 76ab0f530e
4 changed files with 88 additions and 0 deletions
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62
mm/compaction.c
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@ -12,6 +12,7 @@
#include <linux/compaction.h>
#include <linux/mm_inline.h>
#include <linux/backing-dev.h>
#include <linux/sysctl.h>
#include "internal.h"
/*
@ -391,3 +392,64 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
return ret;
}
/* Compact all zones within a node */
static int compact_node(int nid)
{
int zoneid;
pg_data_t *pgdat;
struct zone *zone;
if (nid < 0 || nid >= nr_node_ids || !node_online(nid))
return -EINVAL;
pgdat = NODE_DATA(nid);
/* Flush pending updates to the LRU lists */
lru_add_drain_all();
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
struct compact_control cc = {
.nr_freepages = 0,
.nr_migratepages = 0,
};
zone = &pgdat->node_zones[zoneid];
if (!populated_zone(zone))
continue;
cc.zone = zone;
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));
}
return 0;
}
/* Compact all nodes in the system */
static int compact_nodes(void)
{
int nid;
for_each_online_node(nid)
compact_node(nid);
return COMPACT_COMPLETE;
}
/* The written value is actually unused, all memory is compacted */
int sysctl_compact_memory;
/* This is the entry point for compacting all nodes via /proc/sys/vm */
int sysctl_compaction_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
if (write)
return compact_nodes();
return 0;
}