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- #include <linux/migrate.h>
- #include <linux/export.h>
- #include <linux/swap.h>
- #include <linux/swapops.h>
- #include <linux/pagemap.h>
- #include <linux/buffer_head.h>
- #include <linux/mm_inline.h>
- #include <linux/nsproxy.h>
- #include <linux/pagevec.h>
- #include <linux/ksm.h>
- #include <linux/rmap.h>
- #include <linux/topology.h>
- #include <linux/cpu.h>
- #include <linux/cpuset.h>
- #include <linux/writeback.h>
- #include <linux/mempolicy.h>
- #include <linux/vmalloc.h>
- #include <linux/security.h>
- #include <linux/backing-dev.h>
- #include <linux/compaction.h>
- #include <linux/syscalls.h>
- #include <linux/hugetlb.h>
- #include <linux/hugetlb_cgroup.h>
- #include <linux/gfp.h>
- #include <linux/balloon_compaction.h>
- #include <linux/mmu_notifier.h>
- #include <linux/page_idle.h>
- #include <linux/page_owner.h>
- #include <linux/ptrace.h>
- #include <asm/tlbflush.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/migrate.h>
- #include "internal.h"
- int migrate_prep(void)
- {
-
- lru_add_drain_all();
- return 0;
- }
- int migrate_prep_local(void)
- {
- lru_add_drain();
- return 0;
- }
- bool isolate_movable_page(struct page *page, isolate_mode_t mode)
- {
- struct address_space *mapping;
-
- if (unlikely(!get_page_unless_zero(page)))
- goto out;
-
- if (unlikely(!__PageMovable(page)))
- goto out_putpage;
-
- if (unlikely(!trylock_page(page)))
- goto out_putpage;
- if (!PageMovable(page) || PageIsolated(page))
- goto out_no_isolated;
- mapping = page_mapping(page);
- VM_BUG_ON_PAGE(!mapping, page);
- if (!mapping->a_ops->isolate_page(page, mode))
- goto out_no_isolated;
-
- WARN_ON_ONCE(PageIsolated(page));
- __SetPageIsolated(page);
- unlock_page(page);
- return true;
- out_no_isolated:
- unlock_page(page);
- out_putpage:
- put_page(page);
- out:
- return false;
- }
- void putback_movable_page(struct page *page)
- {
- struct address_space *mapping;
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(!PageMovable(page), page);
- VM_BUG_ON_PAGE(!PageIsolated(page), page);
- mapping = page_mapping(page);
- mapping->a_ops->putback_page(page);
- __ClearPageIsolated(page);
- }
- void putback_movable_pages(struct list_head *l)
- {
- struct page *page;
- struct page *page2;
- list_for_each_entry_safe(page, page2, l, lru) {
- if (unlikely(PageHuge(page))) {
- putback_active_hugepage(page);
- continue;
- }
- list_del(&page->lru);
-
- if (unlikely(__PageMovable(page))) {
- VM_BUG_ON_PAGE(!PageIsolated(page), page);
- lock_page(page);
- if (PageMovable(page))
- putback_movable_page(page);
- else
- __ClearPageIsolated(page);
- unlock_page(page);
- put_page(page);
- } else {
- dec_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
- putback_lru_page(page);
- }
- }
- }
- static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
- unsigned long addr, void *old)
- {
- struct mm_struct *mm = vma->vm_mm;
- swp_entry_t entry;
- pmd_t *pmd;
- pte_t *ptep, pte;
- spinlock_t *ptl;
- if (unlikely(PageHuge(new))) {
- ptep = huge_pte_offset(mm, addr);
- if (!ptep)
- goto out;
- ptl = huge_pte_lockptr(hstate_vma(vma), mm, ptep);
- } else {
- pmd = mm_find_pmd(mm, addr);
- if (!pmd)
- goto out;
- ptep = pte_offset_map(pmd, addr);
-
- ptl = pte_lockptr(mm, pmd);
- }
- spin_lock(ptl);
- pte = *ptep;
- if (!is_swap_pte(pte))
- goto unlock;
- entry = pte_to_swp_entry(pte);
- if (!is_migration_entry(entry) ||
- migration_entry_to_page(entry) != old)
- goto unlock;
- get_page(new);
- pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
- if (pte_swp_soft_dirty(*ptep))
- pte = pte_mksoft_dirty(pte);
-
- if (is_write_migration_entry(entry))
- pte = maybe_mkwrite(pte, vma);
- #ifdef CONFIG_HUGETLB_PAGE
- if (PageHuge(new)) {
- pte = pte_mkhuge(pte);
- pte = arch_make_huge_pte(pte, vma, new, 0);
- }
- #endif
- flush_dcache_page(new);
- set_pte_at(mm, addr, ptep, pte);
- if (PageHuge(new)) {
- if (PageAnon(new))
- hugepage_add_anon_rmap(new, vma, addr);
- else
- page_dup_rmap(new, true);
- } else if (PageAnon(new))
- page_add_anon_rmap(new, vma, addr, false);
- else
- page_add_file_rmap(new, false);
- if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
- mlock_vma_page(new);
-
- update_mmu_cache(vma, addr, ptep);
- unlock:
- pte_unmap_unlock(ptep, ptl);
- out:
- return SWAP_AGAIN;
- }
- void remove_migration_ptes(struct page *old, struct page *new, bool locked)
- {
- struct rmap_walk_control rwc = {
- .rmap_one = remove_migration_pte,
- .arg = old,
- };
- if (locked)
- rmap_walk_locked(new, &rwc);
- else
- rmap_walk(new, &rwc);
- }
- void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
- spinlock_t *ptl)
- {
- pte_t pte;
- swp_entry_t entry;
- struct page *page;
- spin_lock(ptl);
- pte = *ptep;
- if (!is_swap_pte(pte))
- goto out;
- entry = pte_to_swp_entry(pte);
- if (!is_migration_entry(entry))
- goto out;
- page = migration_entry_to_page(entry);
-
- if (!get_page_unless_zero(page))
- goto out;
- pte_unmap_unlock(ptep, ptl);
- wait_on_page_locked(page);
- put_page(page);
- return;
- out:
- pte_unmap_unlock(ptep, ptl);
- }
- void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
- unsigned long address)
- {
- spinlock_t *ptl = pte_lockptr(mm, pmd);
- pte_t *ptep = pte_offset_map(pmd, address);
- __migration_entry_wait(mm, ptep, ptl);
- }
- void migration_entry_wait_huge(struct vm_area_struct *vma,
- struct mm_struct *mm, pte_t *pte)
- {
- spinlock_t *ptl = huge_pte_lockptr(hstate_vma(vma), mm, pte);
- __migration_entry_wait(mm, pte, ptl);
- }
- #ifdef CONFIG_BLOCK
- static bool buffer_migrate_lock_buffers(struct buffer_head *head,
- enum migrate_mode mode)
- {
- struct buffer_head *bh = head;
-
- if (mode != MIGRATE_ASYNC) {
- do {
- get_bh(bh);
- lock_buffer(bh);
- bh = bh->b_this_page;
- } while (bh != head);
- return true;
- }
-
- do {
- get_bh(bh);
- if (!trylock_buffer(bh)) {
-
- struct buffer_head *failed_bh = bh;
- put_bh(failed_bh);
- bh = head;
- while (bh != failed_bh) {
- unlock_buffer(bh);
- put_bh(bh);
- bh = bh->b_this_page;
- }
- return false;
- }
- bh = bh->b_this_page;
- } while (bh != head);
- return true;
- }
- #else
- static inline bool buffer_migrate_lock_buffers(struct buffer_head *head,
- enum migrate_mode mode)
- {
- return true;
- }
- #endif
- int migrate_page_move_mapping(struct address_space *mapping,
- struct page *newpage, struct page *page,
- struct buffer_head *head, enum migrate_mode mode,
- int extra_count)
- {
- struct zone *oldzone, *newzone;
- int dirty;
- int expected_count = 1 + extra_count;
- void **pslot;
- if (!mapping) {
-
- if (page_count(page) != expected_count)
- return -EAGAIN;
-
- newpage->index = page->index;
- newpage->mapping = page->mapping;
- if (PageSwapBacked(page))
- __SetPageSwapBacked(newpage);
- return MIGRATEPAGE_SUCCESS;
- }
- oldzone = page_zone(page);
- newzone = page_zone(newpage);
- spin_lock_irq(&mapping->tree_lock);
- pslot = radix_tree_lookup_slot(&mapping->page_tree,
- page_index(page));
- expected_count += 1 + page_has_private(page);
- if (page_count(page) != expected_count ||
- radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) {
- spin_unlock_irq(&mapping->tree_lock);
- return -EAGAIN;
- }
- if (!page_ref_freeze(page, expected_count)) {
- spin_unlock_irq(&mapping->tree_lock);
- return -EAGAIN;
- }
-
- if (mode == MIGRATE_ASYNC && head &&
- !buffer_migrate_lock_buffers(head, mode)) {
- page_ref_unfreeze(page, expected_count);
- spin_unlock_irq(&mapping->tree_lock);
- return -EAGAIN;
- }
-
- newpage->index = page->index;
- newpage->mapping = page->mapping;
- if (PageSwapBacked(page))
- __SetPageSwapBacked(newpage);
- get_page(newpage);
- if (PageSwapCache(page)) {
- SetPageSwapCache(newpage);
- set_page_private(newpage, page_private(page));
- }
-
- dirty = PageDirty(page);
- if (dirty) {
- ClearPageDirty(page);
- SetPageDirty(newpage);
- }
- radix_tree_replace_slot(pslot, newpage);
-
- page_ref_unfreeze(page, expected_count - 1);
- spin_unlock(&mapping->tree_lock);
-
-
- if (newzone != oldzone) {
- __dec_node_state(oldzone->zone_pgdat, NR_FILE_PAGES);
- __inc_node_state(newzone->zone_pgdat, NR_FILE_PAGES);
- if (PageSwapBacked(page) && !PageSwapCache(page)) {
- __dec_node_state(oldzone->zone_pgdat, NR_SHMEM);
- __inc_node_state(newzone->zone_pgdat, NR_SHMEM);
- }
- if (dirty && mapping_cap_account_dirty(mapping)) {
- __dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
- __dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING);
- __inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY);
- __inc_zone_state(newzone, NR_ZONE_WRITE_PENDING);
- }
- }
- local_irq_enable();
- return MIGRATEPAGE_SUCCESS;
- }
- EXPORT_SYMBOL(migrate_page_move_mapping);
- int migrate_huge_page_move_mapping(struct address_space *mapping,
- struct page *newpage, struct page *page)
- {
- int expected_count;
- void **pslot;
- spin_lock_irq(&mapping->tree_lock);
- pslot = radix_tree_lookup_slot(&mapping->page_tree,
- page_index(page));
- expected_count = 2 + page_has_private(page);
- if (page_count(page) != expected_count ||
- radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) {
- spin_unlock_irq(&mapping->tree_lock);
- return -EAGAIN;
- }
- if (!page_ref_freeze(page, expected_count)) {
- spin_unlock_irq(&mapping->tree_lock);
- return -EAGAIN;
- }
- newpage->index = page->index;
- newpage->mapping = page->mapping;
- get_page(newpage);
- radix_tree_replace_slot(pslot, newpage);
- page_ref_unfreeze(page, expected_count - 1);
- spin_unlock_irq(&mapping->tree_lock);
- return MIGRATEPAGE_SUCCESS;
- }
- static void __copy_gigantic_page(struct page *dst, struct page *src,
- int nr_pages)
- {
- int i;
- struct page *dst_base = dst;
- struct page *src_base = src;
- for (i = 0; i < nr_pages; ) {
- cond_resched();
- 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)
- {
- int i;
- int nr_pages;
- if (PageHuge(src)) {
-
- struct hstate *h = page_hstate(src);
- nr_pages = pages_per_huge_page(h);
- if (unlikely(nr_pages > MAX_ORDER_NR_PAGES)) {
- __copy_gigantic_page(dst, src, nr_pages);
- return;
- }
- } else {
-
- BUG_ON(!PageTransHuge(src));
- nr_pages = hpage_nr_pages(src);
- }
- for (i = 0; i < nr_pages; i++) {
- cond_resched();
- copy_highpage(dst + i, src + i);
- }
- }
- void migrate_page_copy(struct page *newpage, struct page *page)
- {
- int cpupid;
- if (PageHuge(page) || PageTransHuge(page))
- copy_huge_page(newpage, page);
- else
- copy_highpage(newpage, page);
- if (PageError(page))
- SetPageError(newpage);
- if (PageReferenced(page))
- SetPageReferenced(newpage);
- if (PageUptodate(page))
- SetPageUptodate(newpage);
- if (TestClearPageActive(page)) {
- VM_BUG_ON_PAGE(PageUnevictable(page), page);
- SetPageActive(newpage);
- } else if (TestClearPageUnevictable(page))
- SetPageUnevictable(newpage);
- if (PageWorkingset(page))
- SetPageWorkingset(newpage);
- if (PageChecked(page))
- SetPageChecked(newpage);
- if (PageMappedToDisk(page))
- SetPageMappedToDisk(newpage);
-
- if (PageDirty(page))
- SetPageDirty(newpage);
- if (page_is_young(page))
- set_page_young(newpage);
- if (page_is_idle(page))
- set_page_idle(newpage);
-
- cpupid = page_cpupid_xchg_last(page, -1);
- page_cpupid_xchg_last(newpage, cpupid);
- ksm_migrate_page(newpage, page);
-
- if (PageSwapCache(page))
- ClearPageSwapCache(page);
- ClearPagePrivate(page);
- set_page_private(page, 0);
-
- if (PageWriteback(newpage))
- end_page_writeback(newpage);
- copy_page_owner(page, newpage);
- mem_cgroup_migrate(page, newpage);
- }
- EXPORT_SYMBOL(migrate_page_copy);
- int migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page,
- enum migrate_mode mode)
- {
- int rc;
- BUG_ON(PageWriteback(page));
- rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
- if (rc != MIGRATEPAGE_SUCCESS)
- return rc;
- migrate_page_copy(newpage, page);
- return MIGRATEPAGE_SUCCESS;
- }
- EXPORT_SYMBOL(migrate_page);
- #ifdef CONFIG_BLOCK
- int buffer_migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page, enum migrate_mode mode)
- {
- struct buffer_head *bh, *head;
- int rc;
- if (!page_has_buffers(page))
- return migrate_page(mapping, newpage, page, mode);
- head = page_buffers(page);
- rc = migrate_page_move_mapping(mapping, newpage, page, head, mode, 0);
- if (rc != MIGRATEPAGE_SUCCESS)
- return rc;
-
- if (mode != MIGRATE_ASYNC)
- BUG_ON(!buffer_migrate_lock_buffers(head, mode));
- ClearPagePrivate(page);
- set_page_private(newpage, page_private(page));
- set_page_private(page, 0);
- put_page(page);
- get_page(newpage);
- bh = head;
- do {
- set_bh_page(bh, newpage, bh_offset(bh));
- bh = bh->b_this_page;
- } while (bh != head);
- SetPagePrivate(newpage);
- migrate_page_copy(newpage, page);
- bh = head;
- do {
- unlock_buffer(bh);
- put_bh(bh);
- bh = bh->b_this_page;
- } while (bh != head);
- return MIGRATEPAGE_SUCCESS;
- }
- EXPORT_SYMBOL(buffer_migrate_page);
- #endif
- static int writeout(struct address_space *mapping, struct page *page)
- {
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_NONE,
- .nr_to_write = 1,
- .range_start = 0,
- .range_end = LLONG_MAX,
- .for_reclaim = 1
- };
- int rc;
- if (!mapping->a_ops->writepage)
-
- return -EINVAL;
- if (!clear_page_dirty_for_io(page))
-
- return -EAGAIN;
-
- remove_migration_ptes(page, page, false);
- rc = mapping->a_ops->writepage(page, &wbc);
- if (rc != AOP_WRITEPAGE_ACTIVATE)
-
- lock_page(page);
- return (rc < 0) ? -EIO : -EAGAIN;
- }
- static int fallback_migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page, enum migrate_mode mode)
- {
- if (PageDirty(page)) {
-
- if (mode != MIGRATE_SYNC)
- return -EBUSY;
- return writeout(mapping, page);
- }
-
- if (page_has_private(page) &&
- !try_to_release_page(page, GFP_KERNEL))
- return -EAGAIN;
- return migrate_page(mapping, newpage, page, mode);
- }
- static int move_to_new_page(struct page *newpage, struct page *page,
- enum migrate_mode mode)
- {
- struct address_space *mapping;
- int rc = -EAGAIN;
- bool is_lru = !__PageMovable(page);
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
- mapping = page_mapping(page);
- if (likely(is_lru)) {
- if (!mapping)
- rc = migrate_page(mapping, newpage, page, mode);
- else if (mapping->a_ops->migratepage)
-
- rc = mapping->a_ops->migratepage(mapping, newpage,
- page, mode);
- else
- rc = fallback_migrate_page(mapping, newpage,
- page, mode);
- } else {
-
- VM_BUG_ON_PAGE(!PageIsolated(page), page);
- if (!PageMovable(page)) {
- rc = MIGRATEPAGE_SUCCESS;
- __ClearPageIsolated(page);
- goto out;
- }
- rc = mapping->a_ops->migratepage(mapping, newpage,
- page, mode);
- WARN_ON_ONCE(rc == MIGRATEPAGE_SUCCESS &&
- !PageIsolated(page));
- }
-
- if (rc == MIGRATEPAGE_SUCCESS) {
- if (__PageMovable(page)) {
- VM_BUG_ON_PAGE(!PageIsolated(page), page);
-
- __ClearPageIsolated(page);
- }
-
- if (!PageMappingFlags(page))
- page->mapping = NULL;
- }
- out:
- return rc;
- }
- static int __unmap_and_move(struct page *page, struct page *newpage,
- int force, enum migrate_mode mode)
- {
- int rc = -EAGAIN;
- int page_was_mapped = 0;
- struct anon_vma *anon_vma = NULL;
- bool is_lru = !__PageMovable(page);
- if (!trylock_page(page)) {
- if (!force || mode == MIGRATE_ASYNC)
- goto out;
-
- if (current->flags & PF_MEMALLOC)
- goto out;
- lock_page(page);
- }
- if (PageWriteback(page)) {
-
- if (mode != MIGRATE_SYNC) {
- rc = -EBUSY;
- goto out_unlock;
- }
- if (!force)
- goto out_unlock;
- wait_on_page_writeback(page);
- }
-
- if (PageAnon(page) && !PageKsm(page))
- anon_vma = page_get_anon_vma(page);
-
- if (unlikely(!trylock_page(newpage)))
- goto out_unlock;
- if (unlikely(!is_lru)) {
- rc = move_to_new_page(newpage, page, mode);
- goto out_unlock_both;
- }
-
- if (!page->mapping) {
- VM_BUG_ON_PAGE(PageAnon(page), page);
- if (page_has_private(page)) {
- try_to_free_buffers(page);
- goto out_unlock_both;
- }
- } else if (page_mapped(page)) {
-
- VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma,
- page);
- try_to_unmap(page,
- TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
- page_was_mapped = 1;
- }
- if (!page_mapped(page))
- rc = move_to_new_page(newpage, page, mode);
- if (page_was_mapped)
- remove_migration_ptes(page,
- rc == MIGRATEPAGE_SUCCESS ? newpage : page, false);
- out_unlock_both:
- unlock_page(newpage);
- out_unlock:
-
- if (anon_vma)
- put_anon_vma(anon_vma);
- unlock_page(page);
- out:
-
- if (rc == MIGRATEPAGE_SUCCESS) {
- if (unlikely(!is_lru))
- put_page(newpage);
- else
- putback_lru_page(newpage);
- }
- return rc;
- }
- #if (GCC_VERSION >= 40700 && GCC_VERSION < 40900) && defined(CONFIG_ARM)
- #define ICE_noinline noinline
- #else
- #define ICE_noinline
- #endif
- static ICE_noinline int unmap_and_move(new_page_t get_new_page,
- free_page_t put_new_page,
- unsigned long private, struct page *page,
- int force, enum migrate_mode mode,
- enum migrate_reason reason)
- {
- int rc = MIGRATEPAGE_SUCCESS;
- int *result = NULL;
- struct page *newpage;
- newpage = get_new_page(page, private, &result);
- if (!newpage)
- return -ENOMEM;
- if (page_count(page) == 1) {
-
- ClearPageActive(page);
- ClearPageUnevictable(page);
- if (unlikely(__PageMovable(page))) {
- lock_page(page);
- if (!PageMovable(page))
- __ClearPageIsolated(page);
- unlock_page(page);
- }
- if (put_new_page)
- put_new_page(newpage, private);
- else
- put_page(newpage);
- goto out;
- }
- if (unlikely(PageTransHuge(page))) {
- lock_page(page);
- rc = split_huge_page(page);
- unlock_page(page);
- if (rc)
- goto out;
- }
- rc = __unmap_and_move(page, newpage, force, mode);
- if (rc == MIGRATEPAGE_SUCCESS)
- set_page_owner_migrate_reason(newpage, reason);
- out:
- if (rc != -EAGAIN) {
-
- list_del(&page->lru);
-
- if (likely(!__PageMovable(page)))
- dec_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
- }
-
- if (rc == MIGRATEPAGE_SUCCESS) {
- put_page(page);
- if (reason == MR_MEMORY_FAILURE) {
-
- if (!test_set_page_hwpoison(page))
- num_poisoned_pages_inc();
- }
- } else {
- if (rc != -EAGAIN) {
- if (likely(!__PageMovable(page))) {
- putback_lru_page(page);
- goto put_new;
- }
- lock_page(page);
- if (PageMovable(page))
- putback_movable_page(page);
- else
- __ClearPageIsolated(page);
- unlock_page(page);
- put_page(page);
- }
- put_new:
- if (put_new_page)
- put_new_page(newpage, private);
- else
- put_page(newpage);
- }
- if (result) {
- if (rc)
- *result = rc;
- else
- *result = page_to_nid(newpage);
- }
- return rc;
- }
- static int unmap_and_move_huge_page(new_page_t get_new_page,
- free_page_t put_new_page, unsigned long private,
- struct page *hpage, int force,
- enum migrate_mode mode, int reason)
- {
- int rc = -EAGAIN;
- int *result = NULL;
- int page_was_mapped = 0;
- struct page *new_hpage;
- struct anon_vma *anon_vma = NULL;
-
- if (!hugepage_migration_supported(page_hstate(hpage))) {
- putback_active_hugepage(hpage);
- return -ENOSYS;
- }
- new_hpage = get_new_page(hpage, private, &result);
- if (!new_hpage)
- return -ENOMEM;
- if (!trylock_page(hpage)) {
- if (!force || mode != MIGRATE_SYNC)
- goto out;
- lock_page(hpage);
- }
-
- if (page_private(hpage) && !page_mapping(hpage)) {
- rc = -EBUSY;
- goto out_unlock;
- }
- if (PageAnon(hpage))
- anon_vma = page_get_anon_vma(hpage);
- if (unlikely(!trylock_page(new_hpage)))
- goto put_anon;
- if (page_mapped(hpage)) {
- try_to_unmap(hpage,
- TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
- page_was_mapped = 1;
- }
- if (!page_mapped(hpage))
- rc = move_to_new_page(new_hpage, hpage, mode);
- if (page_was_mapped)
- remove_migration_ptes(hpage,
- rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage, false);
- unlock_page(new_hpage);
- put_anon:
- if (anon_vma)
- put_anon_vma(anon_vma);
- if (rc == MIGRATEPAGE_SUCCESS) {
- hugetlb_cgroup_migrate(hpage, new_hpage);
- put_new_page = NULL;
- set_page_owner_migrate_reason(new_hpage, reason);
- }
- out_unlock:
- unlock_page(hpage);
- out:
- if (rc != -EAGAIN)
- putback_active_hugepage(hpage);
-
- if (put_new_page)
- put_new_page(new_hpage, private);
- else
- putback_active_hugepage(new_hpage);
- if (result) {
- if (rc)
- *result = rc;
- else
- *result = page_to_nid(new_hpage);
- }
- return rc;
- }
- int migrate_pages(struct list_head *from, new_page_t get_new_page,
- free_page_t put_new_page, unsigned long private,
- enum migrate_mode mode, int reason)
- {
- int retry = 1;
- int nr_failed = 0;
- int nr_succeeded = 0;
- int pass = 0;
- struct page *page;
- struct page *page2;
- int swapwrite = current->flags & PF_SWAPWRITE;
- int rc;
- trace_mm_migrate_pages_start(mode, reason);
- if (!swapwrite)
- current->flags |= PF_SWAPWRITE;
- for(pass = 0; pass < 10 && retry; pass++) {
- retry = 0;
- list_for_each_entry_safe(page, page2, from, lru) {
- cond_resched();
- if (PageHuge(page))
- rc = unmap_and_move_huge_page(get_new_page,
- put_new_page, private, page,
- pass > 2, mode, reason);
- else
- rc = unmap_and_move(get_new_page, put_new_page,
- private, page, pass > 2, mode,
- reason);
- switch(rc) {
- case -ENOMEM:
- nr_failed++;
- goto out;
- case -EAGAIN:
- retry++;
- break;
- case MIGRATEPAGE_SUCCESS:
- nr_succeeded++;
- break;
- default:
-
- nr_failed++;
- break;
- }
- }
- }
- nr_failed += retry;
- rc = nr_failed;
- out:
- if (nr_succeeded)
- count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
- if (nr_failed)
- count_vm_events(PGMIGRATE_FAIL, nr_failed);
- trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
- if (!swapwrite)
- current->flags &= ~PF_SWAPWRITE;
- return rc;
- }
- #ifdef CONFIG_NUMA
- struct page_to_node {
- unsigned long addr;
- struct page *page;
- int node;
- int status;
- };
- static struct page *new_page_node(struct page *p, unsigned long private,
- int **result)
- {
- struct page_to_node *pm = (struct page_to_node *)private;
- while (pm->node != MAX_NUMNODES && pm->page != p)
- pm++;
- if (pm->node == MAX_NUMNODES)
- return NULL;
- *result = &pm->status;
- if (PageHuge(p))
- return alloc_huge_page_node(page_hstate(compound_head(p)),
- pm->node);
- else
- return __alloc_pages_node(pm->node,
- GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0);
- }
- static int do_move_page_to_node_array(struct mm_struct *mm,
- struct page_to_node *pm,
- int migrate_all)
- {
- int err;
- struct page_to_node *pp;
- LIST_HEAD(pagelist);
- down_read(&mm->mmap_sem);
-
- for (pp = pm; pp->node != MAX_NUMNODES; pp++) {
- struct vm_area_struct *vma;
- struct page *page;
- err = -EFAULT;
- vma = find_vma(mm, pp->addr);
- if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma))
- goto set_status;
-
- page = follow_page(vma, pp->addr,
- FOLL_GET | FOLL_SPLIT | FOLL_DUMP);
- err = PTR_ERR(page);
- if (IS_ERR(page))
- goto set_status;
- err = -ENOENT;
- if (!page)
- goto set_status;
- pp->page = page;
- err = page_to_nid(page);
- if (err == pp->node)
-
- goto put_and_set;
- err = -EACCES;
- if (page_mapcount(page) > 1 &&
- !migrate_all)
- goto put_and_set;
- if (PageHuge(page)) {
- if (PageHead(page))
- isolate_huge_page(page, &pagelist);
- goto put_and_set;
- }
- err = isolate_lru_page(page);
- if (!err) {
- list_add_tail(&page->lru, &pagelist);
- inc_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
- }
- put_and_set:
-
- put_page(page);
- set_status:
- pp->status = err;
- }
- err = 0;
- if (!list_empty(&pagelist)) {
- err = migrate_pages(&pagelist, new_page_node, NULL,
- (unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL);
- if (err)
- putback_movable_pages(&pagelist);
- }
- up_read(&mm->mmap_sem);
- return err;
- }
- static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
- unsigned long nr_pages,
- const void __user * __user *pages,
- const int __user *nodes,
- int __user *status, int flags)
- {
- struct page_to_node *pm;
- unsigned long chunk_nr_pages;
- unsigned long chunk_start;
- int err;
- err = -ENOMEM;
- pm = (struct page_to_node *)__get_free_page(GFP_KERNEL);
- if (!pm)
- goto out;
- migrate_prep();
-
- chunk_nr_pages = (PAGE_SIZE / sizeof(struct page_to_node)) - 1;
- for (chunk_start = 0;
- chunk_start < nr_pages;
- chunk_start += chunk_nr_pages) {
- int j;
- if (chunk_start + chunk_nr_pages > nr_pages)
- chunk_nr_pages = nr_pages - chunk_start;
-
- for (j = 0; j < chunk_nr_pages; j++) {
- const void __user *p;
- int node;
- err = -EFAULT;
- if (get_user(p, pages + j + chunk_start))
- goto out_pm;
- pm[j].addr = (unsigned long) p;
- if (get_user(node, nodes + j + chunk_start))
- goto out_pm;
- err = -ENODEV;
- if (node < 0 || node >= MAX_NUMNODES)
- goto out_pm;
- if (!node_state(node, N_MEMORY))
- goto out_pm;
- err = -EACCES;
- if (!node_isset(node, task_nodes))
- goto out_pm;
- pm[j].node = node;
- }
-
- pm[chunk_nr_pages].node = MAX_NUMNODES;
-
- err = do_move_page_to_node_array(mm, pm,
- flags & MPOL_MF_MOVE_ALL);
- if (err < 0)
- goto out_pm;
-
- for (j = 0; j < chunk_nr_pages; j++)
- if (put_user(pm[j].status, status + j + chunk_start)) {
- err = -EFAULT;
- goto out_pm;
- }
- }
- err = 0;
- out_pm:
- free_page((unsigned long)pm);
- out:
- return err;
- }
- static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages,
- const void __user **pages, int *status)
- {
- unsigned long i;
- down_read(&mm->mmap_sem);
- for (i = 0; i < nr_pages; i++) {
- unsigned long addr = (unsigned long)(*pages);
- struct vm_area_struct *vma;
- struct page *page;
- int err = -EFAULT;
- vma = find_vma(mm, addr);
- if (!vma || addr < vma->vm_start)
- goto set_status;
-
- page = follow_page(vma, addr, FOLL_DUMP);
- err = PTR_ERR(page);
- if (IS_ERR(page))
- goto set_status;
- err = page ? page_to_nid(page) : -ENOENT;
- set_status:
- *status = err;
- pages++;
- status++;
- }
- up_read(&mm->mmap_sem);
- }
- static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages,
- const void __user * __user *pages,
- int __user *status)
- {
- #define DO_PAGES_STAT_CHUNK_NR 16
- const void __user *chunk_pages[DO_PAGES_STAT_CHUNK_NR];
- int chunk_status[DO_PAGES_STAT_CHUNK_NR];
- while (nr_pages) {
- unsigned long chunk_nr;
- chunk_nr = nr_pages;
- if (chunk_nr > DO_PAGES_STAT_CHUNK_NR)
- chunk_nr = DO_PAGES_STAT_CHUNK_NR;
- if (copy_from_user(chunk_pages, pages, chunk_nr * sizeof(*chunk_pages)))
- break;
- do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status);
- if (copy_to_user(status, chunk_status, chunk_nr * sizeof(*status)))
- break;
- pages += chunk_nr;
- status += chunk_nr;
- nr_pages -= chunk_nr;
- }
- return nr_pages ? -EFAULT : 0;
- }
- SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
- const void __user * __user *, pages,
- const int __user *, nodes,
- int __user *, status, int, flags)
- {
- struct task_struct *task;
- struct mm_struct *mm;
- int err;
- nodemask_t task_nodes;
-
- if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL))
- return -EINVAL;
- if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE))
- return -EPERM;
-
- rcu_read_lock();
- task = pid ? find_task_by_vpid(pid) : current;
- if (!task) {
- rcu_read_unlock();
- return -ESRCH;
- }
- get_task_struct(task);
-
- if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) {
- rcu_read_unlock();
- err = -EPERM;
- goto out;
- }
- rcu_read_unlock();
- err = security_task_movememory(task);
- if (err)
- goto out;
- task_nodes = cpuset_mems_allowed(task);
- mm = get_task_mm(task);
- put_task_struct(task);
- if (!mm)
- return -EINVAL;
- if (nodes)
- err = do_pages_move(mm, task_nodes, nr_pages, pages,
- nodes, status, flags);
- else
- err = do_pages_stat(mm, nr_pages, pages, status);
- mmput(mm);
- return err;
- out:
- put_task_struct(task);
- return err;
- }
- #ifdef CONFIG_NUMA_BALANCING
- static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
- unsigned long nr_migrate_pages)
- {
- int z;
- for (z = pgdat->nr_zones - 1; z >= 0; z--) {
- struct zone *zone = pgdat->node_zones + z;
- if (!populated_zone(zone))
- continue;
-
- if (!zone_watermark_ok(zone, 0,
- high_wmark_pages(zone) +
- nr_migrate_pages,
- 0, 0))
- continue;
- return true;
- }
- return false;
- }
- static struct page *alloc_misplaced_dst_page(struct page *page,
- unsigned long data,
- int **result)
- {
- int nid = (int) data;
- struct page *newpage;
- newpage = __alloc_pages_node(nid,
- (GFP_HIGHUSER_MOVABLE |
- __GFP_THISNODE | __GFP_NOMEMALLOC |
- __GFP_NORETRY | __GFP_NOWARN) &
- ~__GFP_RECLAIM, 0);
- return newpage;
- }
- static unsigned int migrate_interval_millisecs __read_mostly = 100;
- static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT);
- static bool numamigrate_update_ratelimit(pg_data_t *pgdat,
- unsigned long nr_pages)
- {
-
- if (time_after(jiffies, pgdat->numabalancing_migrate_next_window)) {
- spin_lock(&pgdat->numabalancing_migrate_lock);
- pgdat->numabalancing_migrate_nr_pages = 0;
- pgdat->numabalancing_migrate_next_window = jiffies +
- msecs_to_jiffies(migrate_interval_millisecs);
- spin_unlock(&pgdat->numabalancing_migrate_lock);
- }
- if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) {
- trace_mm_numa_migrate_ratelimit(current, pgdat->node_id,
- nr_pages);
- return true;
- }
-
- pgdat->numabalancing_migrate_nr_pages += nr_pages;
- return false;
- }
- static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
- {
- int page_lru;
- VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page);
-
- if (!migrate_balanced_pgdat(pgdat, 1UL << compound_order(page)))
- return 0;
- if (isolate_lru_page(page))
- return 0;
-
- if (PageTransHuge(page) && page_count(page) != 3) {
- putback_lru_page(page);
- return 0;
- }
- page_lru = page_is_file_cache(page);
- mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru,
- hpage_nr_pages(page));
-
- put_page(page);
- return 1;
- }
- bool pmd_trans_migrating(pmd_t pmd)
- {
- struct page *page = pmd_page(pmd);
- return PageLocked(page);
- }
- int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
- int node)
- {
- pg_data_t *pgdat = NODE_DATA(node);
- int isolated;
- int nr_remaining;
- LIST_HEAD(migratepages);
-
- if (page_mapcount(page) != 1 && page_is_file_cache(page) &&
- (vma->vm_flags & VM_EXEC))
- goto out;
-
- if (numamigrate_update_ratelimit(pgdat, 1))
- goto out;
- isolated = numamigrate_isolate_page(pgdat, page);
- if (!isolated)
- goto out;
- list_add(&page->lru, &migratepages);
- nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page,
- NULL, node, MIGRATE_ASYNC,
- MR_NUMA_MISPLACED);
- if (nr_remaining) {
- if (!list_empty(&migratepages)) {
- list_del(&page->lru);
- dec_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
- putback_lru_page(page);
- }
- isolated = 0;
- } else
- count_vm_numa_event(NUMA_PAGE_MIGRATE);
- BUG_ON(!list_empty(&migratepages));
- return isolated;
- out:
- put_page(page);
- return 0;
- }
- #endif
- #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
- int migrate_misplaced_transhuge_page(struct mm_struct *mm,
- struct vm_area_struct *vma,
- pmd_t *pmd, pmd_t entry,
- unsigned long address,
- struct page *page, int node)
- {
- spinlock_t *ptl;
- pg_data_t *pgdat = NODE_DATA(node);
- int isolated = 0;
- struct page *new_page = NULL;
- int page_lru = page_is_file_cache(page);
- unsigned long mmun_start = address & HPAGE_PMD_MASK;
- unsigned long mmun_end = mmun_start + HPAGE_PMD_SIZE;
- pmd_t orig_entry;
-
- if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR))
- goto out_dropref;
- new_page = alloc_pages_node(node,
- (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE),
- HPAGE_PMD_ORDER);
- if (!new_page)
- goto out_fail;
- prep_transhuge_page(new_page);
- isolated = numamigrate_isolate_page(pgdat, page);
- if (!isolated) {
- put_page(new_page);
- goto out_fail;
- }
-
- if (mm_tlb_flush_pending(mm))
- flush_tlb_range(vma, mmun_start, mmun_end);
-
- __SetPageLocked(new_page);
- __SetPageSwapBacked(new_page);
-
- new_page->mapping = page->mapping;
- new_page->index = page->index;
- migrate_page_copy(new_page, page);
- WARN_ON(PageLRU(new_page));
-
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, entry) || page_count(page) != 2)) {
- fail_putback:
- spin_unlock(ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
-
- if (TestClearPageActive(new_page))
- SetPageActive(page);
- if (TestClearPageUnevictable(new_page))
- SetPageUnevictable(page);
- unlock_page(new_page);
- put_page(new_page);
-
- get_page(page);
- putback_lru_page(page);
- mod_node_page_state(page_pgdat(page),
- NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
- goto out_unlock;
- }
- orig_entry = *pmd;
- entry = mk_huge_pmd(new_page, vma->vm_page_prot);
- entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
-
- flush_cache_range(vma, mmun_start, mmun_end);
- page_add_anon_rmap(new_page, vma, mmun_start, true);
- pmdp_huge_clear_flush_notify(vma, mmun_start, pmd);
- set_pmd_at(mm, mmun_start, pmd, entry);
- update_mmu_cache_pmd(vma, address, &entry);
- if (page_count(page) != 2) {
- set_pmd_at(mm, mmun_start, pmd, orig_entry);
- flush_pmd_tlb_range(vma, mmun_start, mmun_end);
- mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);
- update_mmu_cache_pmd(vma, address, &entry);
- page_remove_rmap(new_page, true);
- goto fail_putback;
- }
- mlock_migrate_page(new_page, page);
- page_remove_rmap(page, true);
- set_page_owner_migrate_reason(new_page, MR_NUMA_MISPLACED);
- spin_unlock(ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
-
- get_page(new_page);
- putback_lru_page(new_page);
- unlock_page(new_page);
- unlock_page(page);
- put_page(page);
- put_page(page);
- count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
- count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);
- mod_node_page_state(page_pgdat(page),
- NR_ISOLATED_ANON + page_lru,
- -HPAGE_PMD_NR);
- return isolated;
- out_fail:
- count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
- out_dropref:
- ptl = pmd_lock(mm, pmd);
- if (pmd_same(*pmd, entry)) {
- entry = pmd_modify(entry, vma->vm_page_prot);
- set_pmd_at(mm, mmun_start, pmd, entry);
- update_mmu_cache_pmd(vma, address, &entry);
- }
- spin_unlock(ptl);
- out_unlock:
- unlock_page(page);
- put_page(page);
- return 0;
- }
- #endif
- #endif
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