5c755e9fd8
Memory may be hot-removed on a per-memory-block basis, particularly on POWER where the SPARSEMEM section size often matches the memory-block size. A user-level agent must be able to identify which sections of memory are likely to be removable before attempting the potentially expensive operation. This patch adds a file called "removable" to the memory directory in sysfs to help such an agent. In this patch, a memory block is considered removable if; o It contains only MOVABLE pageblocks o It contains only pageblocks with free pages regardless of pageblock type On the other hand, a memory block starting with a PageReserved() page will never be considered removable. Without this patch, the user-agent is forced to choose a memory block to remove randomly. Sample output of the sysfs files: ./memory/memory0/removable: 0 ./memory/memory1/removable: 0 ./memory/memory2/removable: 0 ./memory/memory3/removable: 0 ./memory/memory4/removable: 0 ./memory/memory5/removable: 0 ./memory/memory6/removable: 0 ./memory/memory7/removable: 1 ./memory/memory8/removable: 0 ./memory/memory9/removable: 0 ./memory/memory10/removable: 0 ./memory/memory11/removable: 0 ./memory/memory12/removable: 0 ./memory/memory13/removable: 0 ./memory/memory14/removable: 0 ./memory/memory15/removable: 0 ./memory/memory16/removable: 0 ./memory/memory17/removable: 1 ./memory/memory18/removable: 1 ./memory/memory19/removable: 1 ./memory/memory20/removable: 1 ./memory/memory21/removable: 1 ./memory/memory22/removable: 1 Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
24 lines
907 B
Text
24 lines
907 B
Text
What: /sys/devices/system/memory
|
|
Date: June 2008
|
|
Contact: Badari Pulavarty <pbadari@us.ibm.com>
|
|
Description:
|
|
The /sys/devices/system/memory contains a snapshot of the
|
|
internal state of the kernel memory blocks. Files could be
|
|
added or removed dynamically to represent hot-add/remove
|
|
operations.
|
|
|
|
Users: hotplug memory add/remove tools
|
|
https://w3.opensource.ibm.com/projects/powerpc-utils/
|
|
|
|
What: /sys/devices/system/memory/memoryX/removable
|
|
Date: June 2008
|
|
Contact: Badari Pulavarty <pbadari@us.ibm.com>
|
|
Description:
|
|
The file /sys/devices/system/memory/memoryX/removable
|
|
indicates whether this memory block is removable or not.
|
|
This is useful for a user-level agent to determine
|
|
identify removable sections of the memory before attempting
|
|
potentially expensive hot-remove memory operation
|
|
|
|
Users: hotplug memory remove tools
|
|
https://w3.opensource.ibm.com/projects/powerpc-utils/
|