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Subject[PATCH 4/5] writeback: Adding /sys/devices/system/node/<node>/vmstat
Date
For NUMA node systems it is important to have visibility in memory
characteristics. Two of the /proc/vmstat values "nr_cleaned" and
"nr_dirtied" are added here.

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

Signed-off-by: Michael Rubin <mrubin@google.com>
---
drivers/base/node.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 2872e86..6aaccd9 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -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_FILE_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 */
--
1.7.1


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