#include <linux/bootmem.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
+#include <linux/rmap.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
#include <asm/page.h>
#include <asm/pgtable.h>
-#include <asm/io.h>
+#include <linux/io.h>
#include <linux/hugetlb.h>
#include <linux/node.h>
*/
static DEFINE_SPINLOCK(hugetlb_lock);
+static inline void unlock_or_release_subpool(struct hugepage_subpool *spool)
+{
+ bool free = (spool->count == 0) && (spool->used_hpages == 0);
+
+ spin_unlock(&spool->lock);
+
+ /* If no pages are used, and no other handles to the subpool
+ * remain, free the subpool the subpool remain */
+ if (free)
+ kfree(spool);
+}
+
+struct hugepage_subpool *hugepage_new_subpool(long nr_blocks)
+{
+ struct hugepage_subpool *spool;
+
+ spool = kmalloc(sizeof(*spool), GFP_KERNEL);
+ if (!spool)
+ return NULL;
+
+ spin_lock_init(&spool->lock);
+ spool->count = 1;
+ spool->max_hpages = nr_blocks;
+ spool->used_hpages = 0;
+
+ return spool;
+}
+
+void hugepage_put_subpool(struct hugepage_subpool *spool)
+{
+ spin_lock(&spool->lock);
+ BUG_ON(!spool->count);
+ spool->count--;
+ unlock_or_release_subpool(spool);
+}
+
+static int hugepage_subpool_get_pages(struct hugepage_subpool *spool,
+ long delta)
+{
+ int ret = 0;
+
+ if (!spool)
+ return 0;
+
+ spin_lock(&spool->lock);
+ if ((spool->used_hpages + delta) <= spool->max_hpages) {
+ spool->used_hpages += delta;
+ } else {
+ ret = -ENOMEM;
+ }
+ spin_unlock(&spool->lock);
+
+ return ret;
+}
+
+static void hugepage_subpool_put_pages(struct hugepage_subpool *spool,
+ long delta)
+{
+ if (!spool)
+ return;
+
+ spin_lock(&spool->lock);
+ spool->used_hpages -= delta;
+ /* If hugetlbfs_put_super couldn't free spool due to
+ * an outstanding quota reference, free it now. */
+ unlock_or_release_subpool(spool);
+}
+
+static inline struct hugepage_subpool *subpool_inode(struct inode *inode)
+{
+ return HUGETLBFS_SB(inode->i_sb)->spool;
+}
+
+static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma)
+{
+ return subpool_inode(vma->vm_file->f_dentry->d_inode);
+}
+
/*
* Region tracking -- allows tracking of reservations and instantiated pages
* across the pages in a mapping.
* must either hold the mmap_sem for write, or the mmap_sem for read and
* the hugetlb_instantiation mutex:
*
- * down_write(&mm->mmap_sem);
+ * down_write(&mm->mmap_sem);
* or
- * down_read(&mm->mmap_sem);
- * mutex_lock(&hugetlb_instantiation_mutex);
+ * down_read(&mm->mmap_sem);
+ * mutex_lock(&hugetlb_instantiation_mutex);
*/
struct file_region {
struct list_head link;
if (rg->from > t)
return chg;
- /* We overlap with this area, if it extends futher than
+ /* We overlap with this area, if it extends further than
* us then we must extend ourselves. Account for its
* existing reservation. */
if (rg->to > t) {
(vma->vm_pgoff >> huge_page_order(h));
}
+pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
+ unsigned long address)
+{
+ return vma_hugecache_offset(hstate_vma(vma), vma, address);
+}
+
/*
* Return the size of the pages allocated when backing a VMA. In the majority
* cases this will be same size as used by the page table entries.
return 0;
}
-static void clear_gigantic_page(struct page *page,
- unsigned long addr, unsigned long sz)
-{
- int i;
- struct page *p = page;
-
- might_sleep();
- for (i = 0; i < sz/PAGE_SIZE; i++, p = mem_map_next(p, page, i)) {
- cond_resched();
- clear_user_highpage(p, addr + i * PAGE_SIZE);
- }
-}
-static void clear_huge_page(struct page *page,
- unsigned long addr, unsigned long sz)
+static void copy_gigantic_page(struct page *dst, struct page *src)
{
int i;
-
- if (unlikely(sz/PAGE_SIZE > MAX_ORDER_NR_PAGES)) {
- clear_gigantic_page(page, addr, sz);
- return;
- }
-
- might_sleep();
- for (i = 0; i < sz/PAGE_SIZE; i++) {
- cond_resched();
- clear_user_highpage(page + i, addr + i * PAGE_SIZE);
- }
-}
-
-static void copy_gigantic_page(struct page *dst, struct page *src,
- unsigned long addr, struct vm_area_struct *vma)
-{
- int i;
- struct hstate *h = hstate_vma(vma);
+ struct hstate *h = page_hstate(src);
struct page *dst_base = dst;
struct page *src_base = src;
- might_sleep();
+
for (i = 0; i < pages_per_huge_page(h); ) {
cond_resched();
- copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma);
+ copy_highpage(dst, src);
i++;
dst = mem_map_next(dst, dst_base, i);
src = mem_map_next(src, src_base, i);
}
}
-static void copy_huge_page(struct page *dst, struct page *src,
- unsigned long addr, struct vm_area_struct *vma)
+
+void copy_huge_page(struct page *dst, struct page *src)
{
int i;
- struct hstate *h = hstate_vma(vma);
+ struct hstate *h = page_hstate(src);
if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
- copy_gigantic_page(dst, src, addr, vma);
+ copy_gigantic_page(dst, src);
return;
}
might_sleep();
for (i = 0; i < pages_per_huge_page(h); i++) {
cond_resched();
- copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE, vma);
+ copy_highpage(dst + i, src + i);
}
}
h->free_huge_pages_node[nid]++;
}
+static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
+{
+ struct page *page;
+
+ if (list_empty(&h->hugepage_freelists[nid]))
+ return NULL;
+ page = list_entry(h->hugepage_freelists[nid].next, struct page, lru);
+ list_del(&page->lru);
+ set_page_refcounted(page);
+ h->free_huge_pages--;
+ h->free_huge_pages_node[nid]--;
+ return page;
+}
+
static struct page *dequeue_huge_page_vma(struct hstate *h,
struct vm_area_struct *vma,
unsigned long address, int avoid_reserve)
{
- int nid;
struct page *page = NULL;
struct mempolicy *mpol;
nodemask_t *nodemask;
struct zonelist *zonelist;
struct zone *zone;
struct zoneref *z;
+ unsigned int cpuset_mems_cookie;
- get_mems_allowed();
+retry_cpuset:
+ cpuset_mems_cookie = get_mems_allowed();
zonelist = huge_zonelist(vma, address,
htlb_alloc_mask, &mpol, &nodemask);
/*
/* If reserves cannot be used, ensure enough pages are in the pool */
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
- goto err;;
+ goto err;
for_each_zone_zonelist_nodemask(zone, z, zonelist,
MAX_NR_ZONES - 1, nodemask) {
- nid = zone_to_nid(zone);
- if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask) &&
- !list_empty(&h->hugepage_freelists[nid])) {
- page = list_entry(h->hugepage_freelists[nid].next,
- struct page, lru);
- list_del(&page->lru);
- h->free_huge_pages--;
- h->free_huge_pages_node[nid]--;
-
- if (!avoid_reserve)
- decrement_hugepage_resv_vma(h, vma);
-
- break;
+ if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) {
+ page = dequeue_huge_page_node(h, zone_to_nid(zone));
+ if (page) {
+ if (!avoid_reserve)
+ decrement_hugepage_resv_vma(h, vma);
+ break;
+ }
}
}
-err:
+
mpol_cond_put(mpol);
- put_mems_allowed();
+ if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+ goto retry_cpuset;
return page;
+
+err:
+ mpol_cond_put(mpol);
+ return NULL;
}
static void update_and_free_page(struct hstate *h, struct page *page)
h->nr_huge_pages--;
h->nr_huge_pages_node[page_to_nid(page)]--;
for (i = 0; i < pages_per_huge_page(h); i++) {
- page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced |
- 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved |
- 1 << PG_private | 1<< PG_writeback);
+ page[i].flags &= ~(1 << PG_locked | 1 << PG_error |
+ 1 << PG_referenced | 1 << PG_dirty |
+ 1 << PG_active | 1 << PG_reserved |
+ 1 << PG_private | 1 << PG_writeback);
}
set_compound_page_dtor(page, NULL);
set_page_refcounted(page);
*/
struct hstate *h = page_hstate(page);
int nid = page_to_nid(page);
- struct address_space *mapping;
+ struct hugepage_subpool *spool =
+ (struct hugepage_subpool *)page_private(page);
- mapping = (struct address_space *) page_private(page);
set_page_private(page, 0);
page->mapping = NULL;
BUG_ON(page_count(page));
+ BUG_ON(page_mapcount(page));
INIT_LIST_HEAD(&page->lru);
spin_lock(&hugetlb_lock);
enqueue_huge_page(h, page);
}
spin_unlock(&hugetlb_lock);
- if (mapping)
- hugetlb_put_quota(mapping, 1);
+ hugepage_subpool_put_pages(spool, 1);
}
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
__SetPageHead(page);
for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
__SetPageTail(p);
+ set_page_count(p, 0);
p->first_page = page;
}
}
return dtor == free_huge_page;
}
+EXPORT_SYMBOL_GPL(PageHuge);
static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
{
return ret;
}
-static struct page *alloc_buddy_huge_page(struct hstate *h,
- struct vm_area_struct *vma, unsigned long address)
+static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
{
struct page *page;
- unsigned int nid;
+ unsigned int r_nid;
if (h->order >= MAX_ORDER)
return NULL;
}
spin_unlock(&hugetlb_lock);
- page = alloc_pages(htlb_alloc_mask|__GFP_COMP|
- __GFP_REPEAT|__GFP_NOWARN,
- huge_page_order(h));
+ if (nid == NUMA_NO_NODE)
+ page = alloc_pages(htlb_alloc_mask|__GFP_COMP|
+ __GFP_REPEAT|__GFP_NOWARN,
+ huge_page_order(h));
+ else
+ page = alloc_pages_exact_node(nid,
+ htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE|
+ __GFP_REPEAT|__GFP_NOWARN, huge_page_order(h));
if (page && arch_prepare_hugepage(page)) {
__free_pages(page, huge_page_order(h));
- return NULL;
+ page = NULL;
}
spin_lock(&hugetlb_lock);
if (page) {
- /*
- * This page is now managed by the hugetlb allocator and has
- * no users -- drop the buddy allocator's reference.
- */
- put_page_testzero(page);
- VM_BUG_ON(page_count(page));
- nid = page_to_nid(page);
+ r_nid = page_to_nid(page);
set_compound_page_dtor(page, free_huge_page);
/*
* We incremented the global counters already
*/
- h->nr_huge_pages_node[nid]++;
- h->surplus_huge_pages_node[nid]++;
+ h->nr_huge_pages_node[r_nid]++;
+ h->surplus_huge_pages_node[r_nid]++;
__count_vm_event(HTLB_BUDDY_PGALLOC);
} else {
h->nr_huge_pages--;
}
/*
- * Increase the hugetlb pool such that it can accomodate a reservation
+ * This allocation function is useful in the context where vma is irrelevant.
+ * E.g. soft-offlining uses this function because it only cares physical
+ * address of error page.
+ */
+struct page *alloc_huge_page_node(struct hstate *h, int nid)
+{
+ struct page *page;
+
+ spin_lock(&hugetlb_lock);
+ page = dequeue_huge_page_node(h, nid);
+ spin_unlock(&hugetlb_lock);
+
+ if (!page)
+ page = alloc_buddy_huge_page(h, nid);
+
+ return page;
+}
+
+/*
+ * Increase the hugetlb pool such that it can accommodate a reservation
* of size 'delta'.
*/
static int gather_surplus_pages(struct hstate *h, int delta)
struct page *page, *tmp;
int ret, i;
int needed, allocated;
+ bool alloc_ok = true;
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
if (needed <= 0) {
retry:
spin_unlock(&hugetlb_lock);
for (i = 0; i < needed; i++) {
- page = alloc_buddy_huge_page(h, NULL, 0);
+ page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
- /*
- * We were not able to allocate enough pages to
- * satisfy the entire reservation so we free what
- * we've allocated so far.
- */
- spin_lock(&hugetlb_lock);
- needed = 0;
- goto free;
+ alloc_ok = false;
+ break;
}
-
list_add(&page->lru, &surplus_list);
}
- allocated += needed;
+ allocated += i;
/*
* After retaking hugetlb_lock, we need to recalculate 'needed'
spin_lock(&hugetlb_lock);
needed = (h->resv_huge_pages + delta) -
(h->free_huge_pages + allocated);
- if (needed > 0)
- goto retry;
-
+ if (needed > 0) {
+ if (alloc_ok)
+ goto retry;
+ /*
+ * We were not able to allocate enough pages to
+ * satisfy the entire reservation so we free what
+ * we've allocated so far.
+ */
+ goto free;
+ }
/*
* The surplus_list now contains _at_least_ the number of extra pages
- * needed to accomodate the reservation. Add the appropriate number
+ * needed to accommodate the reservation. Add the appropriate number
* of pages to the hugetlb pool and free the extras back to the buddy
* allocator. Commit the entire reservation here to prevent another
* process from stealing the pages as they are added to the pool but
needed += allocated;
h->resv_huge_pages += delta;
ret = 0;
-free:
+
/* Free the needed pages to the hugetlb pool */
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
if ((--needed) < 0)
break;
list_del(&page->lru);
+ /*
+ * This page is now managed by the hugetlb allocator and has
+ * no users -- drop the buddy allocator's reference.
+ */
+ put_page_testzero(page);
+ VM_BUG_ON(page_count(page));
enqueue_huge_page(h, page);
}
+free:
+ spin_unlock(&hugetlb_lock);
/* Free unnecessary surplus pages to the buddy allocator */
if (!list_empty(&surplus_list)) {
- spin_unlock(&hugetlb_lock);
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
list_del(&page->lru);
- /*
- * The page has a reference count of zero already, so
- * call free_huge_page directly instead of using
- * put_page. This must be done with hugetlb_lock
- * unlocked which is safe because free_huge_page takes
- * hugetlb_lock before deciding how to free the page.
- */
- free_huge_page(page);
+ put_page(page);
}
- spin_lock(&hugetlb_lock);
}
+ spin_lock(&hugetlb_lock);
return ret;
}
/*
* Determine if the huge page at addr within the vma has an associated
* reservation. Where it does not we will need to logically increase
- * reservation and actually increase quota before an allocation can occur.
- * Where any new reservation would be required the reservation change is
- * prepared, but not committed. Once the page has been quota'd allocated
- * an instantiated the change should be committed via vma_commit_reservation.
- * No action is required on failure.
+ * reservation and actually increase subpool usage before an allocation
+ * can occur. Where any new reservation would be required the
+ * reservation change is prepared, but not committed. Once the page
+ * has been allocated from the subpool and instantiated the change should
+ * be committed via vma_commit_reservation. No action is required on
+ * failure.
*/
static long vma_needs_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
static struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve)
{
+ struct hugepage_subpool *spool = subpool_vma(vma);
struct hstate *h = hstate_vma(vma);
struct page *page;
- struct address_space *mapping = vma->vm_file->f_mapping;
- struct inode *inode = mapping->host;
long chg;
/*
- * Processes that did not create the mapping will have no reserves and
- * will not have accounted against quota. Check that the quota can be
- * made before satisfying the allocation
- * MAP_NORESERVE mappings may also need pages and quota allocated
- * if no reserve mapping overlaps.
+ * Processes that did not create the mapping will have no
+ * reserves and will not have accounted against subpool
+ * limit. Check that the subpool limit can be made before
+ * satisfying the allocation MAP_NORESERVE mappings may also
+ * need pages and subpool limit allocated allocated if no reserve
+ * mapping overlaps.
*/
chg = vma_needs_reservation(h, vma, addr);
if (chg < 0)
- return ERR_PTR(chg);
+ return ERR_PTR(-VM_FAULT_OOM);
if (chg)
- if (hugetlb_get_quota(inode->i_mapping, chg))
- return ERR_PTR(-ENOSPC);
+ if (hugepage_subpool_get_pages(spool, chg))
+ return ERR_PTR(-VM_FAULT_SIGBUS);
spin_lock(&hugetlb_lock);
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
spin_unlock(&hugetlb_lock);
if (!page) {
- page = alloc_buddy_huge_page(h, vma, addr);
+ page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
- hugetlb_put_quota(inode->i_mapping, chg);
+ hugepage_subpool_put_pages(spool, chg);
return ERR_PTR(-VM_FAULT_SIGBUS);
}
}
- set_page_refcounted(page);
- set_page_private(page, (unsigned long) mapping);
+ set_page_private(page, (unsigned long)spool);
vma_commit_reservation(h, vma, addr);
struct huge_bootmem_page *m;
list_for_each_entry(m, &huge_boot_pages, list) {
- struct page *page = virt_to_page(m);
struct hstate *h = m->hstate;
+ struct page *page;
+
+#ifdef CONFIG_HIGHMEM
+ page = pfn_to_page(m->phys >> PAGE_SHIFT);
+ free_bootmem_late((unsigned long)m,
+ sizeof(struct huge_bootmem_page));
+#else
+ page = virt_to_page(m);
+#endif
__ClearPageReserved(page);
WARN_ON(page_count(page) != 1);
prep_compound_huge_page(page, h->order);
prep_new_huge_page(h, page, page_to_nid(page));
+ /*
+ * If we had gigantic hugepages allocated at boot time, we need
+ * to restore the 'stolen' pages to totalram_pages in order to
+ * fix confusing memory reports from free(1) and another
+ * side-effects, like CommitLimit going negative.
+ */
+ if (h->order > (MAX_ORDER - 1))
+ totalram_pages += 1 << h->order;
}
}
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)
err = strict_strtoul(buf, 10, &count);
if (err)
- return 0;
+ goto out;
h = kobj_to_hstate(kobj, &nid);
+ if (h->order >= MAX_ORDER) {
+ err = -EINVAL;
+ goto out;
+ }
+
if (nid == NUMA_NO_NODE) {
/*
* global hstate attribute
NODEMASK_FREE(nodes_allowed);
return len;
+out:
+ NODEMASK_FREE(nodes_allowed);
+ return err;
}
static ssize_t nr_hugepages_show(struct kobject *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,
struct kobj_attribute *attr, const char *buf, size_t count)
{
unsigned long input;
struct hstate *h = kobj_to_hstate(kobj, NULL);
+ if (h->order >= MAX_ORDER)
+ return -EINVAL;
+
err = strict_strtoul(buf, 10, &input);
if (err)
- return 0;
+ return err;
spin_lock(&hugetlb_lock);
h->nr_overcommit_huge_pages = input;
/*
* 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
+ * with node devices in node_devices[] using a parallel array. The array
+ * index of a node device or _hstate == node id.
+ * This is here to avoid any static dependency of the node device driver, in
* the base kernel, on the hugetlb module.
*/
struct node_hstate {
struct node_hstate node_hstates[MAX_NUMNODES];
/*
- * A subset of global hstate attributes for node sysdevs
+ * A subset of global hstate attributes for node devices
*/
static struct attribute *per_node_hstate_attrs[] = {
&nr_hugepages_attr.attr,
};
/*
- * kobj_to_node_hstate - lookup global hstate for node sysdev hstate attr kobj.
+ * kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj.
* Returns node id via non-NULL nidp.
*/
static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
}
/*
- * Unregister hstate attributes from a single node sysdev.
+ * Unregister hstate attributes from a single node device.
* 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];
+ struct node_hstate *nhs = &node_hstates[node->dev.id];
if (!nhs->hugepages_kobj)
return; /* no hstate attributes */
}
/*
- * hugetlb module exit: unregister hstate attributes from node sysdevs
+ * hugetlb module exit: unregister hstate attributes from node devices
* that have them.
*/
static void hugetlb_unregister_all_nodes(void)
int nid;
/*
- * disable node sysdev registrations.
+ * disable node device registrations.
*/
register_hugetlbfs_with_node(NULL, NULL);
}
/*
- * Register hstate attributes for a single node sysdev.
+ * Register hstate attributes for a single node device.
* 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];
+ struct node_hstate *nhs = &node_hstates[node->dev.id];
int err;
if (nhs->hugepages_kobj)
return; /* already allocated */
nhs->hugepages_kobj = kobject_create_and_add("hugepages",
- &node->sysdev.kobj);
+ &node->dev.kobj);
if (!nhs->hugepages_kobj)
return;
if (err) {
printk(KERN_ERR "Hugetlb: Unable to add hstate %s"
" for node %d\n",
- h->name, node->sysdev.id);
+ h->name, node->dev.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.
+ * devices of nodes that have memory. All on-line nodes should have
+ * registered their associated device by this time.
*/
static void hugetlb_register_all_nodes(void)
{
for_each_node_state(nid, N_HIGH_MEMORY) {
struct node *node = &node_devices[nid];
- if (node->sysdev.id == nid)
+ if (node->dev.id == nid)
hugetlb_register_node(node);
}
/*
- * Let the node sysdev driver know we're here so it can
+ * Let the node device driver know we're here so it can
* [un]register hstate attributes on node hotplug.
*/
register_hugetlbfs_with_node(hugetlb_register_node,
{
struct hstate *h = &default_hstate;
unsigned long tmp;
+ int ret;
- if (!write)
- tmp = h->max_huge_pages;
+ tmp = h->max_huge_pages;
+
+ if (write && h->order >= MAX_ORDER)
+ return -EINVAL;
table->data = &tmp;
table->maxlen = sizeof(unsigned long);
- proc_doulongvec_minmax(table, write, buffer, length, ppos);
+ ret = proc_doulongvec_minmax(table, write, buffer, length, ppos);
+ if (ret)
+ goto out;
if (write) {
NODEMASK_ALLOC(nodemask_t, nodes_allowed,
if (nodes_allowed != &node_states[N_HIGH_MEMORY])
NODEMASK_FREE(nodes_allowed);
}
-
- return 0;
+out:
+ return ret;
}
int hugetlb_sysctl_handler(struct ctl_table *table, int write,
{
struct hstate *h = &default_hstate;
unsigned long tmp;
+ int ret;
+
+ tmp = h->nr_overcommit_huge_pages;
- if (!write)
- tmp = h->nr_overcommit_huge_pages;
+ if (write && h->order >= MAX_ORDER)
+ return -EINVAL;
table->data = &tmp;
table->maxlen = sizeof(unsigned long);
- proc_doulongvec_minmax(table, write, buffer, length, ppos);
+ ret = proc_doulongvec_minmax(table, write, buffer, length, ppos);
+ if (ret)
+ goto out;
if (write) {
spin_lock(&hugetlb_lock);
h->nr_overcommit_huge_pages = tmp;
spin_unlock(&hugetlb_lock);
}
-
- return 0;
+out:
+ return ret;
}
#endif /* CONFIG_SYSCTL */
* This new VMA should share its siblings reservation map if present.
* The VMA will only ever have a valid reservation map pointer where
* it is being copied for another still existing VMA. As that VMA
- * has a reference to the reservation map it cannot dissappear until
+ * has a reference to the reservation map it cannot disappear until
* after this open call completes. It is therefore safe to take a
* new reference here without additional locking.
*/
{
struct hstate *h = hstate_vma(vma);
struct resv_map *reservations = vma_resv_map(vma);
+ struct hugepage_subpool *spool = subpool_vma(vma);
unsigned long reserve;
unsigned long start;
unsigned long end;
if (reserve) {
hugetlb_acct_memory(h, -reserve);
- hugetlb_put_quota(vma->vm_file->f_mapping, reserve);
+ hugepage_subpool_put_pages(spool, reserve);
}
}
}
pte_t entry;
entry = pte_mkwrite(pte_mkdirty(huge_ptep_get(ptep)));
- if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1)) {
+ if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1))
update_mmu_cache(vma, address, ptep);
- }
}
entry = huge_ptep_get(src_pte);
ptepage = pte_page(entry);
get_page(ptepage);
+ page_dup_rmap(ptepage);
set_huge_pte_at(dst, addr, dst_pte, entry);
}
spin_unlock(&src->page_table_lock);
return -ENOMEM;
}
+static int is_hugetlb_entry_migration(pte_t pte)
+{
+ swp_entry_t swp;
+
+ if (huge_pte_none(pte) || pte_present(pte))
+ return 0;
+ swp = pte_to_swp_entry(pte);
+ if (non_swap_entry(swp) && is_migration_entry(swp))
+ return 1;
+ else
+ return 0;
+}
+
+static int is_hugetlb_entry_hwpoisoned(pte_t pte)
+{
+ swp_entry_t swp;
+
+ if (huge_pte_none(pte) || pte_present(pte))
+ return 0;
+ swp = pte_to_swp_entry(pte);
+ if (non_swap_entry(swp) && is_hwpoison_entry(swp))
+ return 1;
+ else
+ return 0;
+}
+
void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end, struct page *ref_page)
{
unsigned long sz = huge_page_size(h);
/*
- * A page gathering list, protected by per file i_mmap_lock. The
+ * A page gathering list, protected by per file i_mmap_mutex. The
* lock is used to avoid list corruption from multiple unmapping
* of the same page since we are using page->lru.
*/
if (huge_pmd_unshare(mm, &address, ptep))
continue;
+ pte = huge_ptep_get(ptep);
+ if (huge_pte_none(pte))
+ continue;
+
+ /*
+ * HWPoisoned hugepage is already unmapped and dropped reference
+ */
+ if (unlikely(is_hugetlb_entry_hwpoisoned(pte)))
+ continue;
+
+ page = pte_page(pte);
/*
* If a reference page is supplied, it is because a specific
* page is being unmapped, not a range. Ensure the page we
* are about to unmap is the actual page of interest.
*/
if (ref_page) {
- pte = huge_ptep_get(ptep);
- if (huge_pte_none(pte))
- continue;
- page = pte_page(pte);
if (page != ref_page)
continue;
}
pte = huge_ptep_get_and_clear(mm, address, ptep);
- if (huge_pte_none(pte))
- continue;
-
- page = pte_page(pte);
if (pte_dirty(pte))
set_page_dirty(page);
list_add(&page->lru, &page_list);
+
+ /* Bail out after unmapping reference page if supplied */
+ if (ref_page)
+ break;
}
- spin_unlock(&mm->page_table_lock);
flush_tlb_range(vma, start, end);
+ spin_unlock(&mm->page_table_lock);
mmu_notifier_invalidate_range_end(mm, start, end);
list_for_each_entry_safe(page, tmp, &page_list, lru) {
+ page_remove_rmap(page);
list_del(&page->lru);
put_page(page);
}
void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end, struct page *ref_page)
{
- spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
+ mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
__unmap_hugepage_range(vma, start, end, ref_page);
- spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
+ mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
}
/*
* from page cache lookup which is in HPAGE_SIZE units.
*/
address = address & huge_page_mask(h);
- pgoff = ((address - vma->vm_start) >> PAGE_SHIFT)
- + (vma->vm_pgoff >> PAGE_SHIFT);
- mapping = (struct address_space *)page_private(page);
+ pgoff = vma_hugecache_offset(h, vma, address);
+ mapping = vma->vm_file->f_dentry->d_inode->i_mapping;
/*
* 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);
+ mutex_lock(&mapping->i_mmap_mutex);
vma_prio_tree_foreach(iter_vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
/* Do not unmap the current VMA */
if (iter_vma == vma)
address, address + huge_page_size(h),
page);
}
- spin_unlock(&mapping->i_mmap_lock);
+ mutex_unlock(&mapping->i_mmap_mutex);
return 1;
}
+/*
+ * Hugetlb_cow() should be called with page lock of the original hugepage held.
+ * Called with hugetlb_instantiation_mutex held and pte_page locked so we
+ * cannot race with other handlers or page migration.
+ * Keep the pte_same checks anyway to make transition from the mutex easier.
+ */
static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, pte_t pte,
struct page *pagecache_page)
retry_avoidcopy:
/* If no-one else is actually using this page, avoid the copy
* and just make the page writable */
- avoidcopy = (page_count(old_page) == 1);
+ avoidcopy = (page_mapcount(old_page) == 1);
if (avoidcopy) {
+ if (PageAnon(old_page))
+ page_move_anon_rmap(old_page, vma, address);
set_huge_ptep_writable(vma, address, ptep);
return 0;
}
if (outside_reserve) {
BUG_ON(huge_pte_none(pte));
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;
+ ptep = huge_pte_offset(mm, address & huge_page_mask(h));
+ if (likely(pte_same(huge_ptep_get(ptep), pte)))
+ goto retry_avoidcopy;
+ /*
+ * race occurs while re-acquiring page_table_lock, and
+ * our job is done.
+ */
+ return 0;
}
WARN_ON_ONCE(1);
}
return -PTR_ERR(new_page);
}
- copy_huge_page(new_page, old_page, address, vma);
+ /*
+ * When the original hugepage is shared one, it does not have
+ * anon_vma prepared.
+ */
+ if (unlikely(anon_vma_prepare(vma))) {
+ page_cache_release(new_page);
+ page_cache_release(old_page);
+ /* Caller expects lock to be held */
+ spin_lock(&mm->page_table_lock);
+ return VM_FAULT_OOM;
+ }
+
+ copy_user_huge_page(new_page, old_page, address, vma,
+ pages_per_huge_page(h));
__SetPageUptodate(new_page);
/*
huge_ptep_clear_flush(vma, address, ptep);
set_huge_pte_at(mm, address, ptep,
make_huge_pte(vma, new_page, 1));
+ page_remove_rmap(old_page);
+ hugepage_add_new_anon_rmap(new_page, vma, address);
/* Make the old page be freed below */
new_page = old_page;
mmu_notifier_invalidate_range_end(mm,
{
struct hstate *h = hstate_vma(vma);
int ret = VM_FAULT_SIGBUS;
+ int anon_rmap = 0;
pgoff_t idx;
unsigned long size;
struct page *page;
/*
* Currently, we are forced to kill the process in the event the
* original mapper has unmapped pages from the child due to a failed
- * COW. Warn that such a situation has occured as it may not be obvious
+ * COW. Warn that such a situation has occurred as it may not be obvious
*/
if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) {
printk(KERN_WARNING
ret = -PTR_ERR(page);
goto out;
}
- clear_huge_page(page, address, huge_page_size(h));
+ clear_huge_page(page, address, pages_per_huge_page(h));
__SetPageUptodate(page);
if (vma->vm_flags & VM_MAYSHARE) {
spin_unlock(&inode->i_lock);
} else {
lock_page(page);
- page->mapping = HUGETLB_POISON;
+ if (unlikely(anon_vma_prepare(vma))) {
+ ret = VM_FAULT_OOM;
+ goto backout_unlocked;
+ }
+ anon_rmap = 1;
+ }
+ } else {
+ /*
+ * If memory error occurs between mmap() and fault, some process
+ * don't have hwpoisoned swap entry for errored virtual address.
+ * So we need to block hugepage fault by PG_hwpoison bit check.
+ */
+ if (unlikely(PageHWPoison(page))) {
+ ret = VM_FAULT_HWPOISON |
+ VM_FAULT_SET_HINDEX(h - hstates);
+ goto backout_unlocked;
}
}
if (!huge_pte_none(huge_ptep_get(ptep)))
goto backout;
+ if (anon_rmap)
+ hugepage_add_new_anon_rmap(page, vma, address);
+ else
+ page_dup_rmap(page);
new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE)
&& (vma->vm_flags & VM_SHARED)));
set_huge_pte_at(mm, address, ptep, new_pte);
pte_t *ptep;
pte_t entry;
int ret;
+ struct page *page = NULL;
struct page *pagecache_page = NULL;
static DEFINE_MUTEX(hugetlb_instantiation_mutex);
struct hstate *h = hstate_vma(vma);
+ address &= huge_page_mask(h);
+
+ ptep = huge_pte_offset(mm, address);
+ if (ptep) {
+ entry = huge_ptep_get(ptep);
+ if (unlikely(is_hugetlb_entry_migration(entry))) {
+ migration_entry_wait(mm, (pmd_t *)ptep, address);
+ return 0;
+ } else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
+ return VM_FAULT_HWPOISON_LARGE |
+ VM_FAULT_SET_HINDEX(h - hstates);
+ }
+
ptep = huge_pte_alloc(mm, address, huge_page_size(h));
if (!ptep)
return VM_FAULT_OOM;
vma, address);
}
+ /*
+ * hugetlb_cow() requires page locks of pte_page(entry) and
+ * pagecache_page, so here we need take the former one
+ * when page != pagecache_page or !pagecache_page.
+ * Note that locking order is always pagecache_page -> page,
+ * so no worry about deadlock.
+ */
+ page = pte_page(entry);
+ get_page(page);
+ if (page != pagecache_page)
+ lock_page(page);
+
spin_lock(&mm->page_table_lock);
/* Check for a racing update before calling hugetlb_cow */
if (unlikely(!pte_same(entry, huge_ptep_get(ptep))))
unlock_page(pagecache_page);
put_page(pagecache_page);
}
+ if (page != pagecache_page)
+ unlock_page(page);
+ put_page(page);
out_mutex:
mutex_unlock(&hugetlb_instantiation_mutex);
BUG_ON(address >= end);
flush_cache_range(vma, address, end);
- spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
+ mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
spin_lock(&mm->page_table_lock);
for (; address < end; address += huge_page_size(h)) {
ptep = huge_pte_offset(mm, address);
}
}
spin_unlock(&mm->page_table_lock);
- spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
+ mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
flush_tlb_range(vma, start, end);
}
int hugetlb_reserve_pages(struct inode *inode,
long from, long to,
struct vm_area_struct *vma,
- int acctflag)
+ vm_flags_t vm_flags)
{
long ret, chg;
struct hstate *h = hstate_inode(inode);
+ struct hugepage_subpool *spool = subpool_inode(inode);
/*
* Only apply hugepage reservation if asked. At fault time, an
* attempt will be made for VM_NORESERVE to allocate a page
- * and filesystem quota without using reserves
+ * without using reserves
*/
- if (acctflag & VM_NORESERVE)
+ if (vm_flags & VM_NORESERVE)
return 0;
/*
if (chg < 0)
return chg;
- /* There must be enough filesystem quota for the mapping */
- if (hugetlb_get_quota(inode->i_mapping, chg))
+ /* There must be enough pages in the subpool for the mapping */
+ if (hugepage_subpool_get_pages(spool, chg))
return -ENOSPC;
/*
* Check enough hugepages are available for the reservation.
- * Hand back the quota if there are not
+ * Hand the pages back to the subpool if there are not
*/
ret = hugetlb_acct_memory(h, chg);
if (ret < 0) {
- hugetlb_put_quota(inode->i_mapping, chg);
+ hugepage_subpool_put_pages(spool, chg);
return ret;
}
{
struct hstate *h = hstate_inode(inode);
long chg = region_truncate(&inode->i_mapping->private_list, offset);
+ struct hugepage_subpool *spool = subpool_inode(inode);
spin_lock(&inode->i_lock);
inode->i_blocks -= (blocks_per_huge_page(h) * freed);
spin_unlock(&inode->i_lock);
- hugetlb_put_quota(inode->i_mapping, (chg - freed));
+ hugepage_subpool_put_pages(spool, (chg - freed));
hugetlb_acct_memory(h, -(chg - freed));
}
+
+#ifdef CONFIG_MEMORY_FAILURE
+
+/* Should be called in hugetlb_lock */
+static int is_hugepage_on_freelist(struct page *hpage)
+{
+ struct page *page;
+ struct page *tmp;
+ struct hstate *h = page_hstate(hpage);
+ int nid = page_to_nid(hpage);
+
+ list_for_each_entry_safe(page, tmp, &h->hugepage_freelists[nid], lru)
+ if (page == hpage)
+ return 1;
+ return 0;
+}
+
+/*
+ * This function is called from memory failure code.
+ * Assume the caller holds page lock of the head page.
+ */
+int dequeue_hwpoisoned_huge_page(struct page *hpage)
+{
+ struct hstate *h = page_hstate(hpage);
+ int nid = page_to_nid(hpage);
+ int ret = -EBUSY;
+
+ spin_lock(&hugetlb_lock);
+ if (is_hugepage_on_freelist(hpage)) {
+ list_del(&hpage->lru);
+ set_page_refcounted(hpage);
+ h->free_huge_pages--;
+ h->free_huge_pages_node[nid]--;
+ ret = 0;
+ }
+ spin_unlock(&hugetlb_lock);
+ return ret;
+}
+#endif
projects / linux-flexiantxendom0-3.2.10.git / blobdiff