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Commit 1830794a authored by Alex Chiang's avatar Alex Chiang Committed by Linus Torvalds
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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: default avatarAlex Chiang <achiang@hp.com>
Acked-by: default avatarDavid 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b9d52dad

drivers/base/node.c

+10 −1
Original line number Original line 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 register_cpu_under_node(unsigned int cpu, unsigned int nid)

{

{

	int ret;

	struct sys_device *obj;

	struct sys_device *obj;





	if (!node_online(nid))

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

	if (!obj)

		return 0;

		return 0;





	return sysfs_create_link(&node_devices[nid].sysdev.kobj,

	ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,

				&obj->kobj,

				&obj->kobj,

				kobject_name(&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)

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,

	sysfs_remove_link(&node_devices[nid].sysdev.kobj,

			  kobject_name(&obj->kobj));

			  kobject_name(&obj->kobj));

	sysfs_remove_link(&obj->kobj,

			  kobject_name(&node_devices[nid].sysdev.kobj));





	return 0;

	return 0;

}

}