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mm: add numa node symlink for cpu devices in sysfs

Browse source 
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>
This commit is contained in:
Alex Chiang 2009-12-14 17:59:08 -08:00 committed by Linus Torvalds
parent b9d52dad94
commit 1830794ae6
1 changed files with 10 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/base/node.c
View file

@ -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;
}