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Commit 2ac39037 authored by Michael Rubin's avatar Michael Rubin Committed by Linus Torvalds
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writeback: add /sys/devices/system/node/<node>/vmstat 



For NUMA node systems it is important to have visibility in memory
characteristics.  Two of the /proc/vmstat values "nr_written" and
"nr_dirtied" are added here.

	# cat /sys/devices/system/node/node20/vmstat
	nr_written 0
	nr_dirtied 0

Signed-off-by: default avatarMichael Rubin <mrubin@google.com>
Reviewed-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ea941f0e

drivers/base/node.c

+14 −0
Original line number Diff line number Diff line
@@ -160,6 +160,18 @@ static ssize_t node_read_numastat(struct sys_device * dev, 
}

static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);



static ssize_t node_read_vmstat(struct sys_device *dev,

				struct sysdev_attribute *attr, char *buf)

{

	int nid = dev->id;

	return sprintf(buf,

		"nr_written %lu\n"

		"nr_dirtied %lu\n",

		node_page_state(nid, NR_WRITTEN),

		node_page_state(nid, NR_DIRTIED));

}

static SYSDEV_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL);



static ssize_t node_read_distance(struct sys_device * dev,

			struct sysdev_attribute *attr, char * buf)

{
@@ -243,6 +255,7 @@ int register_node(struct node *node, int num, struct node *parent) 
		sysdev_create_file(&node->sysdev, &attr_meminfo);

		sysdev_create_file(&node->sysdev, &attr_numastat);

		sysdev_create_file(&node->sysdev, &attr_distance);

		sysdev_create_file(&node->sysdev, &attr_vmstat);



		scan_unevictable_register_node(node);
@@ -267,6 +280,7 @@ void unregister_node(struct node *node) 
	sysdev_remove_file(&node->sysdev, &attr_meminfo);

	sysdev_remove_file(&node->sysdev, &attr_numastat);

	sysdev_remove_file(&node->sysdev, &attr_distance);

	sysdev_remove_file(&node->sysdev, &attr_vmstat);



	scan_unevictable_unregister_node(node);

	hugetlb_unregister_node(node);		/* no-op, if memoryless node */