#include <asm/io.h>
#include <linux/hugetlb.h>
+#include <linux/node.h>
#include "internal.h"
const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
/*
* 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;
}
}
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) {
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;
if (!ret)
goto out;
+ /* Bail for signals. Probably ctrl-c from user */
+ if (signal_pending(current))
+ goto out;
}
/*
static struct kobject *hugepages_kobj;
static struct kobject *hstate_kobjs[HUGE_MAX_HSTATE];
-static struct hstate *kobj_to_hstate(struct kobject *kobj)
+static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp);
+
+static struct hstate *kobj_to_hstate(struct kobject *kobj, int *nidp)
{
int i;
+
for (i = 0; i < HUGE_MAX_HSTATE; i++)
- if (hstate_kobjs[i] == kobj)
+ if (hstate_kobjs[i] == kobj) {
+ if (nidp)
+ *nidp = NUMA_NO_NODE;
return &hstates[i];
- BUG();
- return NULL;
+ }
+
+ return kobj_to_node_hstate(kobj, nidp);
}
static ssize_t nr_hugepages_show_common(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- struct hstate *h = kobj_to_hstate(kobj);
- return sprintf(buf, "%lu\n", h->nr_huge_pages);
+ struct hstate *h;
+ unsigned long nr_huge_pages;
+ int nid;
+
+ h = kobj_to_hstate(kobj, &nid);
+ if (nid == NUMA_NO_NODE)
+ nr_huge_pages = h->nr_huge_pages;
+ else
+ nr_huge_pages = h->nr_huge_pages_node[nid];
+
+ return sprintf(buf, "%lu\n", nr_huge_pages);
}
static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t len)
{
int err;
+ int nid;
unsigned long count;
- struct hstate *h = kobj_to_hstate(kobj);
- NODEMASK_ALLOC(nodemask_t, nodes_allowed);
+ struct hstate *h;
+ NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
err = strict_strtoul(buf, 10, &count);
if (err)
return 0;
- if (!(obey_mempolicy && init_nodemask_of_mempolicy(nodes_allowed))) {
- NODEMASK_FREE(nodes_allowed);
- nodes_allowed = &node_online_map;
- }
+ h = kobj_to_hstate(kobj, &nid);
+ if (nid == NUMA_NO_NODE) {
+ /*
+ * global hstate attribute
+ */
+ if (!(obey_mempolicy &&
+ init_nodemask_of_mempolicy(nodes_allowed))) {
+ NODEMASK_FREE(nodes_allowed);
+ nodes_allowed = &node_states[N_HIGH_MEMORY];
+ }
+ } else if (nodes_allowed) {
+ /*
+ * per node hstate attribute: adjust count to global,
+ * but restrict alloc/free to the specified node.
+ */
+ count += h->nr_huge_pages - h->nr_huge_pages_node[nid];
+ init_nodemask_of_node(nodes_allowed, nid);
+ } else
+ nodes_allowed = &node_states[N_HIGH_MEMORY];
+
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;
static ssize_t nr_overcommit_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- struct hstate *h = kobj_to_hstate(kobj);
+ struct hstate *h = kobj_to_hstate(kobj, NULL);
return sprintf(buf, "%lu\n", h->nr_overcommit_huge_pages);
}
static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj,
{
int err;
unsigned long input;
- struct hstate *h = kobj_to_hstate(kobj);
+ struct hstate *h = kobj_to_hstate(kobj, NULL);
err = strict_strtoul(buf, 10, &input);
if (err)
static ssize_t free_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- struct hstate *h = kobj_to_hstate(kobj);
- return sprintf(buf, "%lu\n", h->free_huge_pages);
+ struct hstate *h;
+ unsigned long free_huge_pages;
+ int nid;
+
+ h = kobj_to_hstate(kobj, &nid);
+ if (nid == NUMA_NO_NODE)
+ free_huge_pages = h->free_huge_pages;
+ else
+ free_huge_pages = h->free_huge_pages_node[nid];
+
+ return sprintf(buf, "%lu\n", free_huge_pages);
}
HSTATE_ATTR_RO(free_hugepages);
static ssize_t resv_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- struct hstate *h = kobj_to_hstate(kobj);
+ struct hstate *h = kobj_to_hstate(kobj, NULL);
return sprintf(buf, "%lu\n", h->resv_huge_pages);
}
HSTATE_ATTR_RO(resv_hugepages);
static ssize_t surplus_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- struct hstate *h = kobj_to_hstate(kobj);
- return sprintf(buf, "%lu\n", h->surplus_huge_pages);
+ struct hstate *h;
+ unsigned long surplus_huge_pages;
+ int nid;
+
+ h = kobj_to_hstate(kobj, &nid);
+ if (nid == NUMA_NO_NODE)
+ surplus_huge_pages = h->surplus_huge_pages;
+ else
+ surplus_huge_pages = h->surplus_huge_pages_node[nid];
+
+ return sprintf(buf, "%lu\n", surplus_huge_pages);
}
HSTATE_ATTR_RO(surplus_hugepages);
.attrs = hstate_attrs,
};
-static int __init hugetlb_sysfs_add_hstate(struct hstate *h)
+static int __init hugetlb_sysfs_add_hstate(struct hstate *h,
+ struct kobject *parent,
+ struct kobject **hstate_kobjs,
+ struct attribute_group *hstate_attr_group)
{
int retval;
+ int hi = h - hstates;
- hstate_kobjs[h - hstates] = kobject_create_and_add(h->name,
- hugepages_kobj);
- if (!hstate_kobjs[h - hstates])
+ hstate_kobjs[hi] = kobject_create_and_add(h->name, parent);
+ if (!hstate_kobjs[hi])
return -ENOMEM;
- retval = sysfs_create_group(hstate_kobjs[h - hstates],
- &hstate_attr_group);
+ retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group);
if (retval)
- kobject_put(hstate_kobjs[h - hstates]);
+ kobject_put(hstate_kobjs[hi]);
return retval;
}
return;
for_each_hstate(h) {
- err = hugetlb_sysfs_add_hstate(h);
+ err = hugetlb_sysfs_add_hstate(h, hugepages_kobj,
+ hstate_kobjs, &hstate_attr_group);
if (err)
printk(KERN_ERR "Hugetlb: Unable to add hstate %s",
h->name);
}
}
+#ifdef CONFIG_NUMA
+
+/*
+ * node_hstate/s - associate per node hstate attributes, via their kobjects,
+ * with node sysdevs in node_devices[] using a parallel array. The array
+ * index of a node sysdev or _hstate == node id.
+ * This is here to avoid any static dependency of the node sysdev driver, in
+ * the base kernel, on the hugetlb module.
+ */
+struct node_hstate {
+ struct kobject *hugepages_kobj;
+ struct kobject *hstate_kobjs[HUGE_MAX_HSTATE];
+};
+struct node_hstate node_hstates[MAX_NUMNODES];
+
+/*
+ * A subset of global hstate attributes for node sysdevs
+ */
+static struct attribute *per_node_hstate_attrs[] = {
+ &nr_hugepages_attr.attr,
+ &free_hugepages_attr.attr,
+ &surplus_hugepages_attr.attr,
+ NULL,
+};
+
+static struct attribute_group per_node_hstate_attr_group = {
+ .attrs = per_node_hstate_attrs,
+};
+
+/*
+ * kobj_to_node_hstate - lookup global hstate for node sysdev hstate attr kobj.
+ * Returns node id via non-NULL nidp.
+ */
+static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
+{
+ int nid;
+
+ for (nid = 0; nid < nr_node_ids; nid++) {
+ struct node_hstate *nhs = &node_hstates[nid];
+ int i;
+ for (i = 0; i < HUGE_MAX_HSTATE; i++)
+ if (nhs->hstate_kobjs[i] == kobj) {
+ if (nidp)
+ *nidp = nid;
+ return &hstates[i];
+ }
+ }
+
+ BUG();
+ return NULL;
+}
+
+/*
+ * Unregister hstate attributes from a single node sysdev.
+ * No-op if no hstate attributes attached.
+ */
+void hugetlb_unregister_node(struct node *node)
+{
+ struct hstate *h;
+ struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+
+ if (!nhs->hugepages_kobj)
+ return; /* no hstate attributes */
+
+ for_each_hstate(h)
+ if (nhs->hstate_kobjs[h - hstates]) {
+ kobject_put(nhs->hstate_kobjs[h - hstates]);
+ nhs->hstate_kobjs[h - hstates] = NULL;
+ }
+
+ kobject_put(nhs->hugepages_kobj);
+ nhs->hugepages_kobj = NULL;
+}
+
+/*
+ * hugetlb module exit: unregister hstate attributes from node sysdevs
+ * that have them.
+ */
+static void hugetlb_unregister_all_nodes(void)
+{
+ int nid;
+
+ /*
+ * disable node sysdev registrations.
+ */
+ register_hugetlbfs_with_node(NULL, NULL);
+
+ /*
+ * remove hstate attributes from any nodes that have them.
+ */
+ for (nid = 0; nid < nr_node_ids; nid++)
+ hugetlb_unregister_node(&node_devices[nid]);
+}
+
+/*
+ * Register hstate attributes for a single node sysdev.
+ * No-op if attributes already registered.
+ */
+void hugetlb_register_node(struct node *node)
+{
+ struct hstate *h;
+ struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+ int err;
+
+ if (nhs->hugepages_kobj)
+ return; /* already allocated */
+
+ nhs->hugepages_kobj = kobject_create_and_add("hugepages",
+ &node->sysdev.kobj);
+ if (!nhs->hugepages_kobj)
+ return;
+
+ for_each_hstate(h) {
+ err = hugetlb_sysfs_add_hstate(h, nhs->hugepages_kobj,
+ nhs->hstate_kobjs,
+ &per_node_hstate_attr_group);
+ if (err) {
+ printk(KERN_ERR "Hugetlb: Unable to add hstate %s"
+ " for node %d\n",
+ h->name, node->sysdev.id);
+ hugetlb_unregister_node(node);
+ break;
+ }
+ }
+}
+
+/*
+ * 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_each_node_state(nid, N_HIGH_MEMORY) {
+ struct node *node = &node_devices[nid];
+ if (node->sysdev.id == nid)
+ hugetlb_register_node(node);
+ }
+
+ /*
+ * Let the node sysdev driver know we're here so it can
+ * [un]register hstate attributes on node hotplug.
+ */
+ register_hugetlbfs_with_node(hugetlb_register_node,
+ hugetlb_unregister_node);
+}
+#else /* !CONFIG_NUMA */
+
+static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
+{
+ BUG();
+ if (nidp)
+ *nidp = -1;
+ return NULL;
+}
+
+static void hugetlb_unregister_all_nodes(void) { }
+
+static void hugetlb_register_all_nodes(void) { }
+
+#endif
+
static void __exit hugetlb_exit(void)
{
struct hstate *h;
+ hugetlb_unregister_all_nodes();
+
for_each_hstate(h) {
kobject_put(hstate_kobjs[h - hstates]);
}
hugetlb_sysfs_init();
+ hugetlb_register_all_nodes();
+
return 0;
}
module_init(hugetlb_init);
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);
proc_doulongvec_minmax(table, write, buffer, length, ppos);
if (write) {
- NODEMASK_ALLOC(nodemask_t, nodes_allowed);
+ NODEMASK_ALLOC(nodemask_t, nodes_allowed,
+ GFP_KERNEL | __GFP_NORETRY);
if (!(obey_mempolicy &&
init_nodemask_of_mempolicy(nodes_allowed))) {
NODEMASK_FREE(nodes_allowed);
+ (vma->vm_pgoff >> PAGE_SHIFT);
mapping = (struct address_space *)page_private(page);
+ /*
+ * Take the mapping lock for the duration of the table walk. As
+ * this mapping should be shared between all the VMAs,
+ * __unmap_hugepage_range() is called as the lock is already held
+ */
+ spin_lock(&mapping->i_mmap_lock);
vma_prio_tree_foreach(iter_vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
/* Do not unmap the current VMA */
if (iter_vma == vma)
* from the time of fork. This would look like data corruption
*/
if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER))
- unmap_hugepage_range(iter_vma,
+ __unmap_hugepage_range(iter_vma,
address, address + huge_page_size(h),
page);
}
+ spin_unlock(&mapping->i_mmap_lock);
return 1;
}
outside_reserve = 1;
page_cache_get(old_page);
+
+ /* Drop page_table_lock as buddy allocator may be called */
+ spin_unlock(&mm->page_table_lock);
new_page = alloc_huge_page(vma, address, outside_reserve);
if (IS_ERR(new_page)) {
if (unmap_ref_private(mm, vma, old_page, address)) {
BUG_ON(page_count(old_page) != 1);
BUG_ON(huge_pte_none(pte));
+ spin_lock(&mm->page_table_lock);
goto retry_avoidcopy;
}
WARN_ON_ONCE(1);
}
+ /* Caller expects lock to be held */
+ spin_lock(&mm->page_table_lock);
return -PTR_ERR(new_page);
}
- spin_unlock(&mm->page_table_lock);
copy_huge_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);
- spin_lock(&mm->page_table_lock);
+ /*
+ * Retake the page_table_lock to check for racing updates
+ * before the page tables are altered
+ */
+ spin_lock(&mm->page_table_lock);
ptep = huge_pte_offset(mm, address & huge_page_mask(h));
if (likely(pte_same(huge_ptep_get(ptep), pte))) {
/* Break COW */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff