[PATCH] Show memory section to node relationship in sysfs

[Gary Hade <garyhade@us.ibm.com>]

Show memory section to node relationship in sysfs

Add /sys/devices/system/memory/memoryX/node files to show
the node on which each memory section resides.

Signed-off-by: Gary Hade <garyhade@us.ibm.com>

---
 Documentation/memory-hotplug.txt |    1 -
 drivers/base/memory.c            |   20 ++++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

Index: linux-2.6.27-rc5/drivers/base/memory.c
===================================================================
--- linux-2.6.27-rc5.orig/drivers/base/memory.c	2008-09-03 14:24:54.000000000 -0700
+++ linux-2.6.27-rc5/drivers/base/memory.c	2008-09-03 14:25:14.000000000 -0700
@@ -150,6 +150,22 @@
 	return len;
 }
 
+/*
+ * node on which memory section resides
+ */
+static ssize_t show_mem_node(struct sys_device *dev,
+			struct sysdev_attribute *attr, char *buf)
+{
+	unsigned long start_pfn;
+	int ret;
+	struct memory_block *mem =
+		container_of(dev, struct memory_block, sysdev);
+
+	start_pfn = section_nr_to_pfn(mem->phys_index);
+	ret = pfn_to_nid(start_pfn);
+	return sprintf(buf, "%d\n", ret);
+}
+
 int memory_notify(unsigned long val, void *v)
 {
 	return blocking_notifier_call_chain(&memory_chain, val, v);
@@ -278,6 +294,7 @@
 static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
 static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
 static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
+static SYSDEV_ATTR(node, 0444, show_mem_node, NULL);
 
 #define mem_create_simple_file(mem, attr_name)	\
 	sysdev_create_file(&mem->sysdev, &attr_##attr_name)
@@ -368,6 +385,8 @@
 		ret = mem_create_simple_file(mem, phys_device);
 	if (!ret)
 		ret = mem_create_simple_file(mem, removable);
+	if (!ret)
+		ret = mem_create_simple_file(mem, node);
 
 	return ret;
 }
@@ -413,6 +432,7 @@
 	mem_remove_simple_file(mem, state);
 	mem_remove_simple_file(mem, phys_device);
 	mem_remove_simple_file(mem, removable);
+	mem_remove_simple_file(mem, node);
 	unregister_memory(mem, section);
 
 	return 0;
Index: linux-2.6.27-rc5/Documentation/memory-hotplug.txt
===================================================================
--- linux-2.6.27-rc5.orig/Documentation/memory-hotplug.txt	2008-09-03 14:25:54.000000000 -0700
+++ linux-2.6.27-rc5/Documentation/memory-hotplug.txt	2008-09-03 14:26:15.000000000 -0700
@@ -365,7 +365,6 @@
   - allowing memory hot-add to ZONE_MOVABLE. maybe we need some switch like
     sysctl or new control file.
   - showing memory section and physical device relationship.
-  - showing memory section and node relationship (maybe good for NUMA)
   - showing memory section is under ZONE_MOVABLE or not
   - test and make it better memory offlining.
   - support HugeTLB page migration and offlining.

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