mm: add node states sysfs class attributeS

Add a per node state sysfs class attribute file to /sys/devices/system/node
to display node state masks.

E.g., on a 4-cell HP ia64 NUMA platform, we have 5 nodes: 4 representing
the actual hardware cells and one memory-only pseudo-node representing a
small amount [512MB] of "hardware interleaved" memory.  With this patch, in
/sys/devices/system/node we see:

#ls -1F /sys/devices/system/node
has_cpu
has_normal_memory
node0/
node1/
node2/
node3/
node4/
online
possible
#cat /sys/devices/system/node/possible
0-255
#cat /sys/devices/system/node/online
0-4
#cat /sys/devices/system/node/has_normal_memory
0-4
#cat /sys/devices/system/node/has_cpu
0-3

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/base/node.c b/drivers/base/node.c
index cae346e..88eeed7 100644 (file)
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -12,6 +12,7 @@
 #include <linux/topology.h>
 #include <linux/nodemask.h>
 #include <linux/cpu.h>
+#include <linux/device.h>
 
 static struct sysdev_class node_class = {
        set_kset_name("node"),
@@ -232,8 +233,96 @@ void unregister_one_node(int nid)
        unregister_node(&node_devices[nid]);
 }
 
+/*
+ * node states attributes
+ */
+
+static ssize_t print_nodes_state(enum node_states state, char *buf)
+{
+       int n;
+
+       n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
+       if (n > 0 && PAGE_SIZE > n + 1) {
+               *(buf + n++) = '\n';
+               *(buf + n++) = '\0';
+       }
+       return n;
+}
+
+static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
+{
+       return print_nodes_state(N_POSSIBLE, buf);
+}
+
+static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
+{
+       return print_nodes_state(N_ONLINE, buf);
+}
+
+static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
+                                               char *buf)
+{
+       return print_nodes_state(N_NORMAL_MEMORY, buf);
+}
+
+static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
+{
+       return print_nodes_state(N_CPU, buf);
+}
+
+static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
+static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
+static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
+                                                                       NULL);
+static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
+
+#ifdef CONFIG_HIGHMEM
+static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
+                                                char *buf)
+{
+       return print_nodes_state(N_HIGH_MEMORY, buf);
+}
+
+static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
+                                                                        NULL);
+#endif
+
+struct sysdev_class_attribute *node_state_attr[] = {
+       &attr_possible,
+       &attr_online,
+       &attr_has_normal_memory,
+#ifdef CONFIG_HIGHMEM
+       &attr_has_high_memory,
+#endif
+       &attr_has_cpu,
+};
+
+static int node_states_init(void)
+{
+       int i;
+       int err = 0;
+
+       for (i = 0;  i < NR_NODE_STATES; i++) {
+               int ret;
+               ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
+               if (!err)
+                       err = ret;
+       }
+       return err;
+}
+
 static int __init register_node_type(void)
 {
-       return sysdev_class_register(&node_class);
+       int ret;
+
+       ret = sysdev_class_register(&node_class);
+       if (!ret)
+               ret = node_states_init();
+
+       /*
+        * Note:  we're not going to unregister the node class if we fail
+        * to register the node state class attribute files.
+        */
+       return ret;
 }
 postcore_initcall(register_node_type);