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>
diff --git a/include/linux/node.h b/include/linux/node.h
index 681a697..dae1521 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -28,6 +28,7 @@
struct memory_block;
extern struct node node_devices[];
+typedef void (*node_registration_func_t)(struct node *);
extern int register_node(struct node *, int, struct node *);
extern void unregister_node(struct node *node);
@@ -39,6 +40,11 @@
extern int register_mem_sect_under_node(struct memory_block *mem_blk,
int nid);
extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk);
+
+#ifdef CONFIG_HUGETLBFS
+extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
+ node_registration_func_t unregister);
+#endif
#else
static inline int register_one_node(int nid)
{
@@ -65,6 +71,11 @@
{
return 0;
}
+
+static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
+ node_registration_func_t unreg)
+{
+}
#endif
#define to_node(sys_device) container_of(sys_device, struct node, sysdev)