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

[safe/jmp/linux-2.6] / mm / compaction.c

diff --git a/mm/compaction.c b/mm/compaction.c
index 77854fb..f61f779 100644 (file)
--- 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);
+}
+#endif /* CONFIG_SYSFS && CONFIG_NUMA */