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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: Michael Rubin <mrubin@google.com>
Reviewed-by: Wu 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Rubin 2010-10-26 14:21:35 -07:00 committed by Linus Torvalds
parent ea941f0e2a
commit 2ac390370a
1 changed files with 14 additions and 0 deletions
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14
drivers/base/node.c
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@ -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 */