}
}
-static void copy_gigantic_page(struct page *dst, struct page *src,
+static void copy_user_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 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);
src = mem_map_next(src, src_base, i);
}
}
-static void copy_huge_page(struct page *dst, struct page *src,
+
+static void copy_user_huge_page(struct page *dst, struct page *src,
unsigned long addr, struct vm_area_struct *vma)
{
int i;
struct hstate *h = hstate_vma(vma);
if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
- copy_gigantic_page(dst, src, addr, vma);
+ copy_user_gigantic_page(dst, src, addr, vma);
return;
}
}
}
+static void copy_gigantic_page(struct page *dst, struct page *src)
+{
+ int i;
+ struct hstate *h = page_hstate(src);
+ struct page *dst_base = dst;
+ struct page *src_base = src;
+
+ for (i = 0; i < pages_per_huge_page(h); ) {
+ cond_resched();
+ copy_highpage(dst, src);
+
+ i++;
+ dst = mem_map_next(dst, dst_base, i);
+ src = mem_map_next(src, src_base, i);
+ }
+}
+
+void copy_huge_page(struct page *dst, struct page *src)
+{
+ int i;
+ struct hstate *h = page_hstate(src);
+
+ if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {
+ copy_gigantic_page(dst, src);
+ return;
+ }
+
+ might_sleep();
+ for (i = 0; i < pages_per_huge_page(h); i++) {
+ cond_resched();
+ copy_highpage(dst + i, src + i);
+ }
+}
+
static void enqueue_huge_page(struct hstate *h, struct page *page)
{
int nid = page_to_nid(page);
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;
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:
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));
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--;
return page;
}
+/*
+ * 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 accomodate a reservation
* of size 'delta'.
retry:
spin_unlock(&hugetlb_lock);
for (i = 0; i < needed; i++) {
- page = alloc_buddy_huge_page(h, NULL, 0);
- if (!page) {
+ 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;
- }
list_add(&page->lru, &surplus_list);
}
needed += allocated;
h->resv_huge_pages += delta;
ret = 0;
-free:
+
+ spin_unlock(&hugetlb_lock);
/* 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 unnecessary surplus pages to the buddy allocator */
+free:
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;
}
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);
return ERR_PTR(-VM_FAULT_SIGBUS);
}
}
- set_page_refcounted(page);
set_page_private(page, (unsigned long) mapping);
vma_commit_reservation(h, vma, addr);
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;
* When the original hugepage is shared one, it does not have
* anon_vma prepared.
*/
- if (unlikely(anon_vma_prepare(vma)))
+ if (unlikely(anon_vma_prepare(vma))) {
+ /* Caller expects lock to be held */
+ spin_lock(&mm->page_table_lock);
return VM_FAULT_OOM;
+ }
- copy_huge_page(new_page, old_page, address, vma);
+ copy_user_huge_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);
/*
hugepage_add_new_anon_rmap(page, vma, address);
}
} 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;
+ }
page_dup_rmap(page);
}
- /*
- * Since memory error handler replaces pte into hwpoison swap entry
- * at the time of error handling, a process which reserved but not have
- * the mapping to the error hugepage does not have hwpoison swap entry.
- * So we need to block accesses from such a process by checking
- * PG_hwpoison bit here.
- */
- if (unlikely(PageHWPoison(page))) {
- ret = VM_FAULT_HWPOISON;
- goto backout_unlocked;
- }
-
/*
* If we are going to COW a private mapping later, we examine the
* pending reservations for this page now. This will ensure that
ptep = huge_pte_offset(mm, address);
if (ptep) {
entry = huge_ptep_get(ptep);
- if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
- return VM_FAULT_HWPOISON;
+ 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));
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.
*/
-void __isolate_hwpoisoned_huge_page(struct page *hpage)
+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);
- list_del(&hpage->lru);
- h->free_huge_pages--;
- h->free_huge_pages_node[nid]--;
+ 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
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff