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hugetlb: use only nodes with memory for huge pages 

Register per node hstate sysfs attributes only for nodes with memory.
Global replacement of 'all online nodes" with "all nodes with memory" in
mm/hugetlb.c.  Suggested by David Rientjes.

A subsequent patch will handle adding/removing of per node hstate sysfs
attributes when nodes transition to/from memoryless state via memory
hotplug.

NOTE: this patch has not been tested with memoryless nodes.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Reviewed-by: Andi Kleen <andi@firstfloor.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: 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>
This commit is contained in:
Lee Schermerhorn 2009-12-14 17:58:32 -08:00 committed by Linus Torvalds
parent 267b4c281b
commit 9b5e5d0fdc
2 changed files with 24 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/vm/hugetlbpage.txt
View File

@ -90,11 +90,11 @@ huge page pool to 20, allocating or freeing huge pages, as required.
On a NUMA platform, the kernel will attempt to distribute the huge page pool
over all the set of allowed nodes specified by the NUMA memory policy of the
task that modifies nr_hugepages. The default for the allowed nodes--when the
task has default memory policy--is all on-line nodes. Allowed nodes with
insufficient available, contiguous memory for a huge page will be silently
skipped when allocating persistent huge pages. See the discussion below of
the interaction of task memory policy, cpusets and per node attributes with
the allocation and freeing of persistent huge pages.
task has default memory policy--is all on-line nodes with memory. Allowed
nodes with insufficient available, contiguous memory for a huge page will be
silently skipped when allocating persistent huge pages. See the discussion
below of the interaction of task memory policy, cpusets and per node attributes
with the allocation and freeing of persistent huge pages.
The success or failure of huge page allocation depends on the amount of
physically contiguous memory that is present in system at the time of the
@ -226,7 +226,7 @@ resulting effect on persistent huge page allocation is as follows:
without first moving to a cpuset that contains all of the desired nodes.
5) Boot-time huge page allocation attempts to distribute the requested number
of huge pages over all on-lines nodes.
of huge pages over all on-lines nodes with memory.
Per Node Hugepages Attributes

35
mm/hugetlb.c
View File

@ -942,14 +942,14 @@ static void return_unused_surplus_pages(struct hstate *h,
/*
* We want to release as many surplus pages as possible, spread
* evenly across all nodes. Iterate across all nodes until we
* can no longer free unreserved surplus pages. This occurs when
* the nodes with surplus pages have no free pages.
* free_pool_huge_page() will balance the the frees across the
* on-line nodes for us and will handle the hstate accounting.
* evenly across all nodes with memory. Iterate across these nodes
* until we can no longer free unreserved surplus pages. This occurs
* when the nodes with surplus pages have no free pages.
* free_pool_huge_page() will balance the the freed pages across the
* on-line nodes with memory and will handle the hstate accounting.
*/
while (nr_pages--) {
if (!free_pool_huge_page(h, &node_online_map, 1))
if (!free_pool_huge_page(h, &node_states[N_HIGH_MEMORY], 1))
break;
}
}
@ -1053,14 +1053,14 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
int __weak alloc_bootmem_huge_page(struct hstate *h)
{
struct huge_bootmem_page *m;
int nr_nodes = nodes_weight(node_online_map);
int nr_nodes = nodes_weight(node_states[N_HIGH_MEMORY]);
while (nr_nodes) {
void *addr;
addr = __alloc_bootmem_node_nopanic(
NODE_DATA(hstate_next_node_to_alloc(h,
&node_online_map)),
&node_states[N_HIGH_MEMORY])),
huge_page_size(h), huge_page_size(h), 0);
if (addr) {
@ -1115,7 +1115,8 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
if (h->order >= MAX_ORDER) {
if (!alloc_bootmem_huge_page(h))
break;
} else if (!alloc_fresh_huge_page(h, &node_online_map))
} else if (!alloc_fresh_huge_page(h,
&node_states[N_HIGH_MEMORY]))
break;
}
h->max_huge_pages = i;
@ -1388,7 +1389,7 @@ static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed);
if (nodes_allowed != &node_online_map)
if (nodes_allowed != &node_states[N_HIGH_MEMORY])
NODEMASK_FREE(nodes_allowed);
return len;
@ -1610,7 +1611,7 @@ void hugetlb_unregister_node(struct node *node)
struct node_hstate *nhs = &node_hstates[node->sysdev.id];
if (!nhs->hugepages_kobj)
return;
return; /* no hstate attributes */
for_each_hstate(h)
if (nhs->hstate_kobjs[h - hstates]) {
@ -1675,15 +1676,15 @@ void hugetlb_register_node(struct node *node)
}
/*
* hugetlb init time: register hstate attributes for all registered
* node sysdevs. All on-line nodes should have registered their
* associated sysdev by the time the hugetlb module initializes.
* hugetlb init time: register hstate attributes for all registered node
* sysdevs of nodes that have memory. All on-line nodes should have
* registered their associated sysdev by this time.
*/
static void hugetlb_register_all_nodes(void)
{
int nid;
for (nid = 0; nid < nr_node_ids; nid++) {
for_each_node_state(nid, N_HIGH_MEMORY) {
struct node *node = &node_devices[nid];
if (node->sysdev.id == nid)
hugetlb_register_node(node);
@ -1777,8 +1778,8 @@ void __init hugetlb_add_hstate(unsigned order)
h->free_huge_pages = 0;
for (i = 0; i < MAX_NUMNODES; ++i)
INIT_LIST_HEAD(&h->hugepage_freelists[i]);
h->next_nid_to_alloc = first_node(node_online_map);
h->next_nid_to_free = first_node(node_online_map);
h->next_nid_to_alloc = first_node(node_states[N_HIGH_MEMORY]);
h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
huge_page_size(h)/1024);