diff options
author | Gary Hade <garyhade@us.ibm.com> | 2009-01-06 17:39:14 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 18:59:00 -0500 |
commit | c04fc586c1a480ba198f03ae7b6cbd7b57380b91 (patch) | |
tree | 9d6544a3b62cc01dbcbb1e315b84378b45ba86d2 /arch/sh/mm | |
parent | ee53a891f47444c53318b98dac947ede963db400 (diff) |
mm: show node to memory section relationship with symlinks in sysfs
Show node to memory section relationship with symlinks in sysfs
Add /sys/devices/system/node/nodeX/memoryY symlinks for all
the memory sections located on nodeX. For example:
/sys/devices/system/node/node1/memory135 -> ../../memory/memory135
indicates that memory section 135 resides on node1.
Also revises documentation to cover this change as well as updating
Documentation/ABI/testing/sysfs-devices-memory to include descriptions
of memory hotremove files 'phys_device', 'phys_index', and 'state'
that were previously not described there.
In addition to it always being a good policy to provide users with
the maximum possible amount of physical location information for
resources that can be hot-added and/or hot-removed, the following
are some (but likely not all) of the user benefits provided by
this change.
Immediate:
- Provides information needed to determine the specific node
on which a defective DIMM is located. This will reduce system
downtime when the node or defective DIMM is swapped out.
- Prevents unintended onlining of a memory section that was
previously offlined due to a defective DIMM. This could happen
during node hot-add when the user or node hot-add assist script
onlines _all_ offlined sections due to user or script inability
to identify the specific memory sections located on the hot-added
node. The consequences of reintroducing the defective memory
could be ugly.
- Provides information needed to vary the amount and distribution
of memory on specific nodes for testing or debugging purposes.
Future:
- Will provide information needed to identify the memory
sections that need to be offlined prior to physical removal
of a specific node.
Symlink creation during boot was tested on 2-node x86_64, 2-node
ppc64, and 2-node ia64 systems. Symlink creation during physical
memory hot-add tested on a 2-node x86_64 system.
Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/mm')
-rw-r--r-- | arch/sh/mm/init.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index 6cbef8caeb56..3edf297c829b 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c | |||
@@ -311,7 +311,8 @@ int arch_add_memory(int nid, u64 start, u64 size) | |||
311 | pgdat = NODE_DATA(nid); | 311 | pgdat = NODE_DATA(nid); |
312 | 312 | ||
313 | /* We only have ZONE_NORMAL, so this is easy.. */ | 313 | /* We only have ZONE_NORMAL, so this is easy.. */ |
314 | ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages); | 314 | ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, |
315 | start_pfn, nr_pages); | ||
315 | if (unlikely(ret)) | 316 | if (unlikely(ret)) |
316 | printk("%s: Failed, __add_pages() == %d\n", __func__, ret); | 317 | printk("%s: Failed, __add_pages() == %d\n", __func__, ret); |
317 | 318 | ||