Commit 1830794a authored Dec 14, 2009 by Alex Chiang Committed by Linus Torvalds Dec 15, 2009

mm: add numa node symlink for cpu devices in sysfs



You can discover which CPUs belong to a NUMA node by examining
/sys/devices/system/node/node#/

However, it's not convenient to go in the other direction, when looking at
/sys/devices/system/cpu/cpu#/

Yes, you can muck about in sysfs, but adding these symlinks makes life a
lot more convenient.

Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b9d52dad

drivers/base/node.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -271,6 +271,7 @@ struct node node_devices[MAX_NUMNODES];
		*/
		int register_cpu_under_node(unsigned int cpu, unsigned int nid)
		{
		int ret;
		struct sys_device *obj;

		if (!node_online(nid))
		@@ -280,9 +281,15 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
		if (!obj)
		return 0;

		return sysfs_create_link(&node_devices[nid].sysdev.kobj,
		ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
		&obj->kobj,
		kobject_name(&obj->kobj));
		if (ret)
		return ret;

		return sysfs_create_link(&obj->kobj,
		&node_devices[nid].sysdev.kobj,
		kobject_name(&node_devices[nid].sysdev.kobj));
		}

		int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
		@@ -298,6 +305,8 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)

		sysfs_remove_link(&node_devices[nid].sysdev.kobj,
		kobject_name(&obj->kobj));
		sysfs_remove_link(&obj->kobj,
		kobject_name(&node_devices[nid].sysdev.kobj));

		return 0;
		}

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