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authorGary Hade <garyhade@us.ibm.com>2009-01-06 17:39:14 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 18:59:00 -0500
commitc04fc586c1a480ba198f03ae7b6cbd7b57380b91 (patch)
tree9d6544a3b62cc01dbcbb1e315b84378b45ba86d2 /arch/s390
parentee53a891f47444c53318b98dac947ede963db400 (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/s390')
-rw-r--r--arch/s390/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 158b0d6d7046..f0258ca3b17e 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -183,7 +183,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
183 rc = vmem_add_mapping(start, size); 183 rc = vmem_add_mapping(start, size);
184 if (rc) 184 if (rc)
185 return rc; 185 return rc;
186 rc = __add_pages(zone, PFN_DOWN(start), PFN_DOWN(size)); 186 rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
187 if (rc) 187 if (rc)
188 vmem_remove_mapping(start, size); 188 vmem_remove_mapping(start, size);
189 return rc; 189 return rc;