linux/drivers/base
Badari Pulavarty 5c755e9fd8 memory-hotplug: add sysfs removable attribute for hotplug memory remove
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>
2008-07-24 10:47:21 -07:00
..
power driver core: fix a lot of printk usages of bus_id 2008-07-21 21:54:53 -07:00
attribute_container.c SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00
base.h class: change internal semaphore to a mutex 2008-07-21 21:54:52 -07:00
bus.c bus_remove_device: be more careful about incomplete initialization 2008-04-22 17:40:36 -07:00
class.c class: change internal semaphore to a mutex 2008-07-21 21:54:52 -07:00
core.c driver core: Suppress sysfs warnings for device_rename(). 2008-07-21 21:55:01 -07:00
cpu.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
dd.c driver core: replace remaining __FUNCTION__ occurrences 2008-04-19 19:10:29 -07:00
devres.c Driver core: fix devres_release_all() return value 2007-07-11 16:09:02 -07:00
dma-mapping.c devres: device resource management 2007-02-09 17:39:36 -05:00
driver.c driver core: warn about duplicate driver names on the same bus 2008-04-30 16:52:47 -07:00
firmware_class.c firmware: allow firmware files to be built into kernel image 2008-07-10 14:30:13 +01:00
firmware.c firmware: change firmware_kset to firmware_kobj 2008-01-24 20:40:23 -08:00
hypervisor.c kobject: convert /sys/hypervisor to use kobject_create 2008-01-24 20:40:15 -08:00
init.c Driver core: coding style fixes 2008-01-24 22:50:12 -08:00
isa.c [PATCH] Driver model: add ISA bus 2006-06-21 12:40:49 -07:00
Kconfig always enable FW_LOADER unless EMBEDDED=y 2008-07-21 21:54:58 -07:00
Makefile Merge branch 'dmapool' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-05 19:05:48 -08:00
map.c [PATCH] kobj_map semaphore to mutex conversion 2006-03-20 13:42:58 -08:00
memory.c memory-hotplug: add sysfs removable attribute for hotplug memory remove 2008-07-24 10:47:21 -07:00
module.c Driver core: move the static kobject out of struct driver 2008-01-24 20:40:35 -08:00
node.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
platform.c Implement new suspend and hibernation callbacks for platform busses 2008-06-10 10:59:51 -07:00
sys.c sysdev: Add utility functions for simple int/ulong variable sysdev attributes 2008-07-21 21:55:02 -07:00
topology.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
transport_class.c SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00