Lee Schermerhorn 9a30523066 hugetlb: add per node hstate attributes ... Add the per huge page size control/query attributes to the per node sysdevs: /sys/devices/system/node/node<ID>/hugepages/hugepages-<size>/ nr_hugepages - r/w free_huge_pages - r/o surplus_huge_pages - r/o The patch attempts to re-use/share as much of the existing global hstate attribute initialization and handling, and the "nodes_allowed" constraint processing as possible. Calling set_max_huge_pages() with no node indicates a change to global hstate parameters. In this case, any non-default task mempolicy will be used to generate the nodes_allowed mask. A valid node id indicates an update to that node's hstate parameters, and the count argument specifies the target count for the specified node. From this info, we compute the target global count for the hstate and construct a nodes_allowed node mask contain only the specified node. Setting the node specific nr_hugepages via the per node attribute effectively ignores any task mempolicy or cpuset constraints. With this patch: (me):ls /sys/devices/system/node/node0/hugepages/hugepages-2048kB ./ ../ free_hugepages nr_hugepages surplus_hugepages Starting from: Node 0 HugePages_Total: 0 Node 0 HugePages_Free: 0 Node 0 HugePages_Surp: 0 Node 1 HugePages_Total: 0 Node 1 HugePages_Free: 0 Node 1 HugePages_Surp: 0 Node 2 HugePages_Total: 0 Node 2 HugePages_Free: 0 Node 2 HugePages_Surp: 0 Node 3 HugePages_Total: 0 Node 3 HugePages_Free: 0 Node 3 HugePages_Surp: 0 vm.nr_hugepages = 0 Allocate 16 persistent huge pages on node 2: (me):echo 16 >/sys/devices/system/node/node2/hugepages/hugepages-2048kB/nr_hugepages [Note that this is equivalent to: numactl -m 2 hugeadmin --pool-pages-min 2M:+16 ] Yields: Node 0 HugePages_Total: 0 Node 0 HugePages_Free: 0 Node 0 HugePages_Surp: 0 Node 1 HugePages_Total: 0 Node 1 HugePages_Free: 0 Node 1 HugePages_Surp: 0 Node 2 HugePages_Total: 16 Node 2 HugePages_Free: 16 Node 2 HugePages_Surp: 0 Node 3 HugePages_Total: 0 Node 3 HugePages_Free: 0 Node 3 HugePages_Surp: 0 vm.nr_hugepages = 16 Global controls work as expected--reduce pool to 8 persistent huge pages: (me):echo 8 >/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages Node 0 HugePages_Total: 0 Node 0 HugePages_Free: 0 Node 0 HugePages_Surp: 0 Node 1 HugePages_Total: 0 Node 1 HugePages_Free: 0 Node 1 HugePages_Surp: 0 Node 2 HugePages_Total: 8 Node 2 HugePages_Free: 8 Node 2 HugePages_Surp: 0 Node 3 HugePages_Total: 0 Node 3 HugePages_Free: 0 Node 3 HugePages_Surp: 0 Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Andi Kleen <andi@firstfloor.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: David Rientjes <rientjes@google.com> Cc: Adam Litke <agl@us.ibm.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Eric Whitney <eric.whitney@hp.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-12-15 08:53:12 -08:00
..
power	PM / Runtime: Remove unnecessary braces in __pm_runtime_set_status()	2009-12-06 16:17:57 +01:00
attribute_container.c	driver core: struct device - replace bus_id with dev_name(), dev_set_name()	2009-01-06 10:44:31 -08:00
base.h	Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev	2009-09-15 09:50:49 -07:00
bus.c	Driver core: allow certain drivers prohibit bind/unbind via sysfs	2009-10-30 14:59:51 -07:00
class.c	Driver core: Add support for compatibility classes	2009-09-15 09:50:48 -07:00
core.c	Driver core: fix race in dev_driver_string	2009-12-11 11:24:55 -08:00
cpu.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2009-12-14 09:58:24 -08:00
dd.c	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
devres.c	devres: WARN() and return, don't crash on device_del() of uninitialized device	2009-07-12 13:02:09 -07:00
devtmpfs.c	Driver-Core: devtmpfs - set root directory mode to 0755	2009-12-11 11:24:52 -08:00
dma-coherent.c	driver-core: move dma-coherent.c from kernel to driver/base	2009-09-15 09:50:47 -07:00
dma-mapping.c	devres: device resource management	2007-02-09 17:39:36 -05:00
driver.c	Driver core: fix driver_register() return value	2009-10-30 14:59:51 -07:00
firmware.c	firmware: change firmware_kset to firmware_kobj	2008-01-24 20:40:23 -08:00
firmware_class.c	firmware_class: make request_firmware_nowait more useful	2009-12-11 11:24:52 -08:00
hypervisor.c	kobject: convert /sys/hypervisor to use kobject_create	2008-01-24 20:40:15 -08:00
init.c	Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev	2009-09-15 09:50:49 -07:00
iommu.c	drivers/base/iommu.c: add missing includes	2009-05-06 16:36:10 -07:00
isa.c	dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24)	2009-04-07 08:31:12 -07:00
Kconfig	Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev	2009-09-15 09:50:49 -07:00
Makefile	Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev	2009-09-15 09:50:49 -07:00
map.c	[PATCH] kobj_map semaphore to mutex conversion	2006-03-20 13:42:58 -08:00
memory.c	mm: show node to memory section relationship with symlinks in sysfs	2009-01-06 15:59:00 -08:00
module.c	Driver core: move the static kobject out of struct driver	2008-01-24 20:40:35 -08:00
node.c	hugetlb: add per node hstate attributes	2009-12-15 08:53:12 -08:00
platform.c	Driver Core: Early platform driver buffer	2009-12-11 11:24:55 -08:00
sys.c	driver core: sysdev: do not send KOBJ_ADD uevent if kobject_init_and_add fails	2009-07-28 13:45:22 -07:00
topology.c	cpumask: Use topology_core_cpumask()/topology_thread_cpumask()	2009-01-11 19:12:49 +01:00
transport_class.c	SCSI: convert struct class_device to struct device	2008-04-19 19:10:33 -07:00