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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 /drivers
parent76ab0f530e4a01d4dc20cdc1d5e87753c579dc18 (diff)
downloadblackbird-op-linux-ed4a6d7f0676db50b5023cc01f6cda82a2f2a307.tar.gz
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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 'drivers')
-rw-r--r--drivers/base/node.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 057979a19eea..2bdd8a94ec94 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -9,6 +9,7 @@
#include <linux/memory.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
+#include <linux/compaction.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
@@ -246,6 +247,8 @@ int register_node(struct node *node, int num, struct node *parent)
scan_unevictable_register_node(node);
hugetlb_register_node(node);
+
+ compaction_register_node(node);
}
return error;
}
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