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mm: add numa node symlink for memory section in sysfs

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Commit c04fc586c (mm: show node to memory section relationship with
symlinks in sysfs) created symlinks from nodes to memory sections, e.g.

/sys/devices/system/node/node1/memory135 -> ../../memory/memory135

If you're examining the memory section though and are wondering what node
it might belong to, you can find it by grovelling around in sysfs, but
it's a little cumbersome.

Add a reverse symlink for each memory section that points back to the
node to which it belongs.

Signed-off-by: Alex Chiang <achiang@hp.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: 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 17:59:05 -08:00
committed by Linus Torvalds
parent d99be1a8ec
commit dee5d0d518
3 changed files with 30 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/base/node.c
View File

@@ -312,6 +312,7 @@ static int get_nid_for_pfn(unsigned long pfn)
/* register memory section under specified node if it spans that node */
int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
{
int ret;
unsigned long pfn, sect_start_pfn, sect_end_pfn;
if (!mem_blk)
@@ -328,9 +329,15 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
continue;
if (page_nid != nid)
continue;
return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
&mem_blk->sysdev.kobj,
kobject_name(&mem_blk->sysdev.kobj));
if (ret)
return ret;
return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
&node_devices[nid].sysdev.kobj,
kobject_name(&node_devices[nid].sysdev.kobj));
}
/* mem section does not span the specified node */
return 0;
@@ -359,6 +366,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
continue;
sysfs_remove_link(&node_devices[nid].sysdev.kobj,
kobject_name(&mem_blk->sysdev.kobj));
sysfs_remove_link(&mem_blk->sysdev.kobj,
kobject_name(&node_devices[nid].sysdev.kobj));
}
return 0;
}