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mm: compaction: add /sys trigger for per-node memory compaction

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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>
This commit is contained in:
Mel Gorman 2010-05-24 14:32:29 -07:00 • committed by Linus Torvalds
parent 76ab0f530e
commit ed4a6d7f06
4 changed files with 49 additions and 0 deletions
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3
drivers/base/node.c
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@ -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;
}