path: root/mm/compaction.c
diff options
authorMel Gorman <mel@csn.ul.ie>2010-05-24 14:32:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 08:06:59 -0700
commited4a6d7f0676db50b5023cc01f6cda82a2f2a307 (patch)
tree6496343ba964e105cf30f8703714471f22edc806 /mm/compaction.c
parent76ab0f530e4a01d4dc20cdc1d5e87753c579dc18 (diff)
mm: compaction: add /sys trigger for per-node memory compaction
Add a per-node sysfs file called compact. When the file is written to, each zone in that node is compacted. The intention that this would be used by something like a job scheduler in a batch system before a job starts so that the job can allocate the maximum number of hugepages without significant start-up cost. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Rik van Riel <riel@redhat.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
1 files changed, 23 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 77854fbc0f5..f61f77983ff 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -13,6 +13,7 @@
#include <linux/mm_inline.h>
#include <linux/backing-dev.h>
#include <linux/sysctl.h>
+#include <linux/sysfs.h>
#include "internal.h"
@@ -453,3 +454,25 @@ int sysctl_compaction_handler(struct ctl_table *table, int write,
return 0;
+#if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
+ssize_t sysfs_compact_node(struct sys_device *dev,
+ struct sysdev_attribute *attr,
+ const char *buf, size_t count)
+ compact_node(dev->id);
+ return count;
+static SYSDEV_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
+int compaction_register_node(struct node *node)
+ return sysdev_create_file(&node->sysdev, &attr_compact);
+void compaction_unregister_node(struct node *node)
+ return sysdev_remove_file(&node->sysdev, &attr_compact);