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mm/migrate.c
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/* * Memory Migration functionality - linux/mm/migration.c * * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter * * Page migration was first developed in the context of the memory hotplug * project. The main authors of the migration code are: * * IWAMOTO Toshihiro <iwamoto@valinux.co.jp> * Hirokazu Takahashi <taka@valinux.co.jp> * Dave Hansen <haveblue@us.ibm.com> |
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* Christoph Lameter |
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*/ #include <linux/migrate.h> |
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#include <linux/export.h> |
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#include <linux/swap.h> |
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#include <linux/swapops.h> |
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#include <linux/pagemap.h> |
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#include <linux/buffer_head.h> |
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#include <linux/mm_inline.h> |
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#include <linux/nsproxy.h> |
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#include <linux/pagevec.h> |
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#include <linux/ksm.h> |
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#include <linux/rmap.h> #include <linux/topology.h> #include <linux/cpu.h> #include <linux/cpuset.h> |
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#include <linux/writeback.h> |
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#include <linux/mempolicy.h> #include <linux/vmalloc.h> |
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#include <linux/security.h> |
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#include <linux/memcontrol.h> |
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#include <linux/syscalls.h> |
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#include <linux/hugetlb.h> |
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#include <linux/hugetlb_cgroup.h> |
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#include <linux/gfp.h> |
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#include <linux/balloon_compaction.h> |
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#include <linux/mmu_notifier.h> |
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|
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#include <asm/tlbflush.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/migrate.h> |
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#include "internal.h" |
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/* |
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* migrate_prep() needs to be called before we start compiling a list of pages |
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* to be migrated using isolate_lru_page(). If scheduling work on other CPUs is * undesirable, use migrate_prep_local() |
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*/ int migrate_prep(void) { |
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/* * Clear the LRU lists so pages can be isolated. * Note that pages may be moved off the LRU after we have * drained them. Those pages will fail to migrate like other * pages that may be busy. */ lru_add_drain_all(); return 0; } |
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/* Do the necessary work of migrate_prep but not if it involves other CPUs */ int migrate_prep_local(void) { lru_add_drain(); return 0; } |
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/* |
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* Put previously isolated pages back onto the appropriate lists * from where they were once taken off for compaction/migration. * |
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* This function shall be used whenever the isolated pageset has been * built from lru, balloon, hugetlbfs page. See isolate_migratepages_range() * and isolate_huge_page(). |
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*/ void putback_movable_pages(struct list_head *l) { struct page *page; struct page *page2; list_for_each_entry_safe(page, page2, l, lru) { |
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if (unlikely(PageHuge(page))) { putback_active_hugepage(page); continue; } |
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list_del(&page->lru); dec_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); |
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if (unlikely(isolated_balloon_page(page))) |
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balloon_page_putback(page); else putback_lru_page(page); |
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} |
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} |
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/* * Restore a potential migration pte to a working pte entry */ |
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static int remove_migration_pte(struct page *new, struct vm_area_struct *vma, unsigned long addr, void *old) |
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{ struct mm_struct *mm = vma->vm_mm; swp_entry_t entry; |
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pmd_t *pmd; pte_t *ptep, pte; spinlock_t *ptl; |
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if (unlikely(PageHuge(new))) { ptep = huge_pte_offset(mm, addr); if (!ptep) goto out; |
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ptl = huge_pte_lockptr(hstate_vma(vma), mm, ptep); |
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} else { |
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pmd = mm_find_pmd(mm, addr); if (!pmd) |
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goto out; |
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if (pmd_trans_huge(*pmd)) goto out; |
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|
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ptep = pte_offset_map(pmd, addr); |
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|
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/* * Peek to check is_swap_pte() before taking ptlock? No, we * can race mremap's move_ptes(), which skips anon_vma lock. */ |
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ptl = pte_lockptr(mm, pmd); } |
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|
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spin_lock(ptl); pte = *ptep; if (!is_swap_pte(pte)) |
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goto unlock; |
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entry = pte_to_swp_entry(pte); |
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if (!is_migration_entry(entry) || migration_entry_to_page(entry) != old) goto unlock; |
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|
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get_page(new); pte = pte_mkold(mk_pte(new, vma->vm_page_prot)); |
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if (pte_swp_soft_dirty(*ptep)) pte = pte_mksoft_dirty(pte); |
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if (is_write_migration_entry(entry)) pte = pte_mkwrite(pte); |
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#ifdef CONFIG_HUGETLB_PAGE |
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if (PageHuge(new)) { |
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pte = pte_mkhuge(pte); |
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pte = arch_make_huge_pte(pte, vma, new, 0); } |
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#endif |
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flush_dcache_page(new); |
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set_pte_at(mm, addr, ptep, pte); |
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|
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if (PageHuge(new)) { if (PageAnon(new)) hugepage_add_anon_rmap(new, vma, addr); else page_dup_rmap(new); } else if (PageAnon(new)) |
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page_add_anon_rmap(new, vma, addr); else page_add_file_rmap(new); /* No need to invalidate - it was non-present before */ |
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update_mmu_cache(vma, addr, ptep); |
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unlock: |
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pte_unmap_unlock(ptep, ptl); |
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out: return SWAP_AGAIN; |
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} /* |
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* Congratulations to trinity for discovering this bug. * mm/fremap.c's remap_file_pages() accepts any range within a single vma to * convert that vma to VM_NONLINEAR; and generic_file_remap_pages() will then * replace the specified range by file ptes throughout (maybe populated after). * If page migration finds a page within that range, while it's still located * by vma_interval_tree rather than lost to i_mmap_nonlinear list, no problem: * zap_pte() clears the temporary migration entry before mmap_sem is dropped. * But if the migrating page is in a part of the vma outside the range to be * remapped, then it will not be cleared, and remove_migration_ptes() needs to * deal with it. Fortunately, this part of the vma is of course still linear, * so we just need to use linear location on the nonlinear list. */ static int remove_linear_migration_ptes_from_nonlinear(struct page *page, struct address_space *mapping, void *arg) { struct vm_area_struct *vma; /* hugetlbfs does not support remap_pages, so no huge pgoff worries */ pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); unsigned long addr; list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.nonlinear) { addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); if (addr >= vma->vm_start && addr < vma->vm_end) remove_migration_pte(page, vma, addr, arg); } return SWAP_AGAIN; } /* |
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* Get rid of all migration entries and replace them by * references to the indicated page. */ static void remove_migration_ptes(struct page *old, struct page *new) { |
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struct rmap_walk_control rwc = { .rmap_one = remove_migration_pte, .arg = old, |
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.file_nonlinear = remove_linear_migration_ptes_from_nonlinear, |
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}; rmap_walk(new, &rwc); |
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} /* |
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* Something used the pte of a page under migration. We need to * get to the page and wait until migration is finished. * When we return from this function the fault will be retried. |
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*/ |
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static void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, spinlock_t *ptl) |
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{ |
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pte_t pte; |
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swp_entry_t entry; struct page *page; |
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spin_lock(ptl); |
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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); |
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/* * Once radix-tree replacement of page migration started, page_count * *must* be zero. And, we don't want to call wait_on_page_locked() * against a page without get_page(). * So, we use get_page_unless_zero(), here. Even failed, page fault * will occur again. */ if (!get_page_unless_zero(page)) goto out; |
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pte_unmap_unlock(ptep, ptl); wait_on_page_locked(page); put_page(page); return; out: pte_unmap_unlock(ptep, ptl); } |
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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); } |
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void migration_entry_wait_huge(struct vm_area_struct *vma, struct mm_struct *mm, pte_t *pte) |
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{ |
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spinlock_t *ptl = huge_pte_lockptr(hstate_vma(vma), mm, pte); |
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__migration_entry_wait(mm, pte, ptl); } |
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#ifdef CONFIG_BLOCK /* Returns true if all buffers are successfully locked */ |
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static bool buffer_migrate_lock_buffers(struct buffer_head *head, enum migrate_mode mode) |
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{ struct buffer_head *bh = head; /* Simple case, sync compaction */ |
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if (mode != MIGRATE_ASYNC) { |
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do { get_bh(bh); lock_buffer(bh); bh = bh->b_this_page; } while (bh != head); return true; } /* async case, we cannot block on lock_buffer so use trylock_buffer */ do { get_bh(bh); if (!trylock_buffer(bh)) { /* * We failed to lock the buffer and cannot stall in * async migration. Release the taken locks */ 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, |
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enum migrate_mode mode) |
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{ return true; } #endif /* CONFIG_BLOCK */ |
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/* |
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* Replace the page in the mapping. |
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* * The number of remaining references must be: * 1 for anonymous pages without a mapping * 2 for pages with a mapping |
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* 3 for pages with a mapping and PagePrivate/PagePrivate2 set. |
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*/ |
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int migrate_page_move_mapping(struct address_space *mapping, |
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struct page *newpage, struct page *page, |
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struct buffer_head *head, enum migrate_mode mode, int extra_count) |
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{ |
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int expected_count = 1 + extra_count; |
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void **pslot; |
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|
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if (!mapping) { |
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/* Anonymous page without mapping */ |
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if (page_count(page) != expected_count) |
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return -EAGAIN; |
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return MIGRATEPAGE_SUCCESS; |
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} |
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spin_lock_irq(&mapping->tree_lock); |
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|
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pslot = radix_tree_lookup_slot(&mapping->page_tree, page_index(page)); |
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|
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expected_count += 1 + page_has_private(page); |
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if (page_count(page) != expected_count || |
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radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) { |
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spin_unlock_irq(&mapping->tree_lock); |
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return -EAGAIN; |
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} |
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if (!page_freeze_refs(page, expected_count)) { |
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spin_unlock_irq(&mapping->tree_lock); |
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return -EAGAIN; } |
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/* |
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* In the async migration case of moving a page with buffers, lock the * buffers using trylock before the mapping is moved. If the mapping * was moved, we later failed to lock the buffers and could not move * the mapping back due to an elevated page count, we would have to * block waiting on other references to be dropped. */ |
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if (mode == MIGRATE_ASYNC && head && !buffer_migrate_lock_buffers(head, mode)) { |
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page_unfreeze_refs(page, expected_count); spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } /* |
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* Now we know that no one else is looking at the page. |
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*/ |
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get_page(newpage); /* add cache reference */ |
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if (PageSwapCache(page)) { SetPageSwapCache(newpage); set_page_private(newpage, page_private(page)); } |
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radix_tree_replace_slot(pslot, newpage); /* |
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* Drop cache reference from old page by unfreezing * to one less reference. |
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* We know this isn't the last reference. */ |
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page_unfreeze_refs(page, expected_count - 1); |
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|
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/* * If moved to a different zone then also account * the page for that zone. Other VM counters will be * taken care of when we establish references to the * new page and drop references to the old page. * * Note that anonymous pages are accounted for * via NR_FILE_PAGES and NR_ANON_PAGES if they * are mapped to swap space. */ __dec_zone_page_state(page, NR_FILE_PAGES); __inc_zone_page_state(newpage, NR_FILE_PAGES); |
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if (!PageSwapCache(page) && PageSwapBacked(page)) { |
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__dec_zone_page_state(page, NR_SHMEM); __inc_zone_page_state(newpage, NR_SHMEM); } |
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spin_unlock_irq(&mapping->tree_lock); |
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|
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return MIGRATEPAGE_SUCCESS; |
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} |
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/* |
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* The expected number of remaining references is the same as that * of 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; if (!mapping) { if (page_count(page) != 1) return -EAGAIN; |
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return MIGRATEPAGE_SUCCESS; |
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} 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 || |
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radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) { |
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spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } if (!page_freeze_refs(page, expected_count)) { spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } get_page(newpage); radix_tree_replace_slot(pslot, newpage); |
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page_unfreeze_refs(page, expected_count - 1); |
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spin_unlock_irq(&mapping->tree_lock); |
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return MIGRATEPAGE_SUCCESS; |
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} /* |
30b0a105d mm: thp: give tra... |
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
* Gigantic pages are so large that we do not guarantee that page++ pointer * arithmetic will work across the entire page. We need something more * specialized. */ 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)) { /* hugetlbfs page */ 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 { /* thp page */ 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); } } /* |
b20a35035 [PATCH] page migr... |
497 498 |
* Copy the page to its new location */ |
290408d4a hugetlb: hugepage... |
499 |
void migrate_page_copy(struct page *newpage, struct page *page) |
b20a35035 [PATCH] page migr... |
500 |
{ |
7851a45cd mm: numa: Copy cp... |
501 |
int cpupid; |
b32967ff1 mm: numa: Add THP... |
502 |
if (PageHuge(page) || PageTransHuge(page)) |
290408d4a hugetlb: hugepage... |
503 504 505 |
copy_huge_page(newpage, page); else copy_highpage(newpage, page); |
b20a35035 [PATCH] page migr... |
506 507 508 509 510 511 512 |
if (PageError(page)) SetPageError(newpage); if (PageReferenced(page)) SetPageReferenced(newpage); if (PageUptodate(page)) SetPageUptodate(newpage); |
894bc3104 Unevictable LRU I... |
513 |
if (TestClearPageActive(page)) { |
309381fea mm: dump page whe... |
514 |
VM_BUG_ON_PAGE(PageUnevictable(page), page); |
b20a35035 [PATCH] page migr... |
515 |
SetPageActive(newpage); |
418b27ef5 mm: remove unevic... |
516 517 |
} else if (TestClearPageUnevictable(page)) SetPageUnevictable(newpage); |
b20a35035 [PATCH] page migr... |
518 519 520 521 522 523 524 |
if (PageChecked(page)) SetPageChecked(newpage); if (PageMappedToDisk(page)) SetPageMappedToDisk(newpage); if (PageDirty(page)) { clear_page_dirty_for_io(page); |
3a902c5f6 mm: fix warning o... |
525 526 527 528 529 |
/* * Want to mark the page and the radix tree as dirty, and * redo the accounting that clear_page_dirty_for_io undid, * but we can't use set_page_dirty because that function * is actually a signal that all of the page has become dirty. |
25985edce Fix common misspe... |
530 |
* Whereas only part of our page may be dirty. |
3a902c5f6 mm: fix warning o... |
531 |
*/ |
752dc185d mm: fix warning i... |
532 533 534 535 |
if (PageSwapBacked(page)) SetPageDirty(newpage); else __set_page_dirty_nobuffers(newpage); |
b20a35035 [PATCH] page migr... |
536 |
} |
7851a45cd mm: numa: Copy cp... |
537 538 539 540 541 542 |
/* * Copy NUMA information to the new page, to prevent over-eager * future migrations of this same page. */ cpupid = page_cpupid_xchg_last(page, -1); page_cpupid_xchg_last(newpage, cpupid); |
b291f0003 mlock: mlocked pa... |
543 |
mlock_migrate_page(newpage, page); |
e9995ef97 ksm: rmap_walk to... |
544 |
ksm_migrate_page(newpage, page); |
c8d6553b9 ksm: make KSM pag... |
545 546 547 548 |
/* * Please do not reorder this without considering how mm/ksm.c's * get_ksm_page() depends upon ksm_migrate_page() and PageSwapCache(). */ |
b20a35035 [PATCH] page migr... |
549 |
ClearPageSwapCache(page); |
b20a35035 [PATCH] page migr... |
550 551 |
ClearPagePrivate(page); set_page_private(page, 0); |
b20a35035 [PATCH] page migr... |
552 553 554 555 556 557 558 559 |
/* * If any waiters have accumulated on the new page then * wake them up. */ if (PageWriteback(newpage)) end_page_writeback(newpage); } |
b20a35035 [PATCH] page migr... |
560 |
|
1d8b85ccf [PATCH] page migr... |
561 562 563 |
/************************************************************ * Migration functions ***********************************************************/ |
b20a35035 [PATCH] page migr... |
564 565 |
/* * Common logic to directly migrate a single page suitable for |
266cf658e FS-Cache: Recruit... |
566 |
* pages that do not use PagePrivate/PagePrivate2. |
b20a35035 [PATCH] page migr... |
567 568 569 |
* * Pages are locked upon entry and exit. */ |
2d1db3b11 [PATCH] page migr... |
570 |
int migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
571 572 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
b20a35035 [PATCH] page migr... |
573 574 575 576 |
{ int rc; BUG_ON(PageWriteback(page)); /* Writeback must be complete */ |
8e321fefb aio/migratepages:... |
577 |
rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0); |
b20a35035 [PATCH] page migr... |
578 |
|
78bd52097 mm: adjust addres... |
579 |
if (rc != MIGRATEPAGE_SUCCESS) |
b20a35035 [PATCH] page migr... |
580 581 582 |
return rc; migrate_page_copy(newpage, page); |
78bd52097 mm: adjust addres... |
583 |
return MIGRATEPAGE_SUCCESS; |
b20a35035 [PATCH] page migr... |
584 585 |
} EXPORT_SYMBOL(migrate_page); |
9361401eb [PATCH] BLOCK: Ma... |
586 |
#ifdef CONFIG_BLOCK |
b20a35035 [PATCH] page migr... |
587 |
/* |
1d8b85ccf [PATCH] page migr... |
588 589 590 591 |
* Migration function for pages with buffers. This function can only be used * if the underlying filesystem guarantees that no other references to "page" * exist. */ |
2d1db3b11 [PATCH] page migr... |
592 |
int buffer_migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
593 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
1d8b85ccf [PATCH] page migr... |
594 |
{ |
1d8b85ccf [PATCH] page migr... |
595 596 |
struct buffer_head *bh, *head; int rc; |
1d8b85ccf [PATCH] page migr... |
597 |
if (!page_has_buffers(page)) |
a6bc32b89 mm: compaction: i... |
598 |
return migrate_page(mapping, newpage, page, mode); |
1d8b85ccf [PATCH] page migr... |
599 600 |
head = page_buffers(page); |
8e321fefb aio/migratepages:... |
601 |
rc = migrate_page_move_mapping(mapping, newpage, page, head, mode, 0); |
1d8b85ccf [PATCH] page migr... |
602 |
|
78bd52097 mm: adjust addres... |
603 |
if (rc != MIGRATEPAGE_SUCCESS) |
1d8b85ccf [PATCH] page migr... |
604 |
return rc; |
b969c4ab9 mm: compaction: d... |
605 606 607 608 609 |
/* * In the async case, migrate_page_move_mapping locked the buffers * with an IRQ-safe spinlock held. In the sync case, the buffers * need to be locked now */ |
a6bc32b89 mm: compaction: i... |
610 611 |
if (mode != MIGRATE_ASYNC) BUG_ON(!buffer_migrate_lock_buffers(head, mode)); |
1d8b85ccf [PATCH] page migr... |
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 |
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); |
78bd52097 mm: adjust addres... |
637 |
return MIGRATEPAGE_SUCCESS; |
1d8b85ccf [PATCH] page migr... |
638 639 |
} EXPORT_SYMBOL(buffer_migrate_page); |
9361401eb [PATCH] BLOCK: Ma... |
640 |
#endif |
1d8b85ccf [PATCH] page migr... |
641 |
|
04e62a29b [PATCH] More page... |
642 643 644 645 |
/* * Writeback a page to clean the dirty state */ static int writeout(struct address_space *mapping, struct page *page) |
8351a6e47 [PATCH] page migr... |
646 |
{ |
04e62a29b [PATCH] More page... |
647 648 649 650 651 |
struct writeback_control wbc = { .sync_mode = WB_SYNC_NONE, .nr_to_write = 1, .range_start = 0, .range_end = LLONG_MAX, |
04e62a29b [PATCH] More page... |
652 653 654 655 656 657 658 659 660 661 662 |
.for_reclaim = 1 }; int rc; if (!mapping->a_ops->writepage) /* No write method for the address space */ return -EINVAL; if (!clear_page_dirty_for_io(page)) /* Someone else already triggered a write */ return -EAGAIN; |
8351a6e47 [PATCH] page migr... |
663 |
/* |
04e62a29b [PATCH] More page... |
664 665 666 667 668 669 |
* A dirty page may imply that the underlying filesystem has * the page on some queue. So the page must be clean for * migration. Writeout may mean we loose the lock and the * page state is no longer what we checked for earlier. * At this point we know that the migration attempt cannot * be successful. |
8351a6e47 [PATCH] page migr... |
670 |
*/ |
04e62a29b [PATCH] More page... |
671 |
remove_migration_ptes(page, page); |
8351a6e47 [PATCH] page migr... |
672 |
|
04e62a29b [PATCH] More page... |
673 |
rc = mapping->a_ops->writepage(page, &wbc); |
8351a6e47 [PATCH] page migr... |
674 |
|
04e62a29b [PATCH] More page... |
675 676 677 |
if (rc != AOP_WRITEPAGE_ACTIVATE) /* unlocked. Relock */ lock_page(page); |
bda8550de migration: fix wr... |
678 |
return (rc < 0) ? -EIO : -EAGAIN; |
04e62a29b [PATCH] More page... |
679 680 681 682 683 684 |
} /* * Default handling if a filesystem does not provide a migration function. */ static int fallback_migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
685 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
04e62a29b [PATCH] More page... |
686 |
{ |
b969c4ab9 mm: compaction: d... |
687 |
if (PageDirty(page)) { |
a6bc32b89 mm: compaction: i... |
688 689 |
/* Only writeback pages in full synchronous migration */ if (mode != MIGRATE_SYNC) |
b969c4ab9 mm: compaction: d... |
690 |
return -EBUSY; |
04e62a29b [PATCH] More page... |
691 |
return writeout(mapping, page); |
b969c4ab9 mm: compaction: d... |
692 |
} |
8351a6e47 [PATCH] page migr... |
693 694 695 696 697 |
/* * Buffers may be managed in a filesystem specific way. * We must have no buffers or drop them. */ |
266cf658e FS-Cache: Recruit... |
698 |
if (page_has_private(page) && |
8351a6e47 [PATCH] page migr... |
699 700 |
!try_to_release_page(page, GFP_KERNEL)) return -EAGAIN; |
a6bc32b89 mm: compaction: i... |
701 |
return migrate_page(mapping, newpage, page, mode); |
8351a6e47 [PATCH] page migr... |
702 |
} |
1d8b85ccf [PATCH] page migr... |
703 |
/* |
e24f0b8f7 [PATCH] page migr... |
704 705 706 707 708 |
* Move a page to a newly allocated page * The page is locked and all ptes have been successfully removed. * * The new page will have replaced the old page if this function * is successful. |
894bc3104 Unevictable LRU I... |
709 710 711 |
* * Return value: * < 0 - error code |
78bd52097 mm: adjust addres... |
712 |
* MIGRATEPAGE_SUCCESS - success |
e24f0b8f7 [PATCH] page migr... |
713 |
*/ |
3fe2011ff mm: migration: al... |
714 |
static int move_to_new_page(struct page *newpage, struct page *page, |
a6bc32b89 mm: compaction: i... |
715 |
int remap_swapcache, enum migrate_mode mode) |
e24f0b8f7 [PATCH] page migr... |
716 717 718 719 720 721 722 723 724 |
{ struct address_space *mapping; int rc; /* * Block others from accessing the page when we get around to * establishing additional references. We are the only one * holding a reference to the new page at this point. */ |
529ae9aaa mm: rename page t... |
725 |
if (!trylock_page(newpage)) |
e24f0b8f7 [PATCH] page migr... |
726 727 728 729 730 |
BUG(); /* Prepare mapping for the new page.*/ newpage->index = page->index; newpage->mapping = page->mapping; |
b2e185384 define page_file_... |
731 732 |
if (PageSwapBacked(page)) SetPageSwapBacked(newpage); |
e24f0b8f7 [PATCH] page migr... |
733 734 735 |
mapping = page_mapping(page); if (!mapping) |
a6bc32b89 mm: compaction: i... |
736 |
rc = migrate_page(mapping, newpage, page, mode); |
b969c4ab9 mm: compaction: d... |
737 |
else if (mapping->a_ops->migratepage) |
e24f0b8f7 [PATCH] page migr... |
738 |
/* |
b969c4ab9 mm: compaction: d... |
739 740 741 742 |
* Most pages have a mapping and most filesystems provide a * migratepage callback. Anonymous pages are part of swap * space which also has its own migratepage callback. This * is the most common path for page migration. |
e24f0b8f7 [PATCH] page migr... |
743 |
*/ |
b969c4ab9 mm: compaction: d... |
744 |
rc = mapping->a_ops->migratepage(mapping, |
a6bc32b89 mm: compaction: i... |
745 |
newpage, page, mode); |
b969c4ab9 mm: compaction: d... |
746 |
else |
a6bc32b89 mm: compaction: i... |
747 |
rc = fallback_migrate_page(mapping, newpage, page, mode); |
e24f0b8f7 [PATCH] page migr... |
748 |
|
78bd52097 mm: adjust addres... |
749 |
if (rc != MIGRATEPAGE_SUCCESS) { |
e24f0b8f7 [PATCH] page migr... |
750 |
newpage->mapping = NULL; |
3fe2011ff mm: migration: al... |
751 752 753 |
} else { if (remap_swapcache) remove_migration_ptes(page, newpage); |
35512ecae mm: postpone migr... |
754 |
page->mapping = NULL; |
3fe2011ff mm: migration: al... |
755 |
} |
e24f0b8f7 [PATCH] page migr... |
756 757 758 759 760 |
unlock_page(newpage); return rc; } |
0dabec93d mm: migration: cl... |
761 |
static int __unmap_and_move(struct page *page, struct page *newpage, |
9c620e2bc mm: remove offlin... |
762 |
int force, enum migrate_mode mode) |
e24f0b8f7 [PATCH] page migr... |
763 |
{ |
0dabec93d mm: migration: cl... |
764 |
int rc = -EAGAIN; |
3fe2011ff mm: migration: al... |
765 |
int remap_swapcache = 1; |
56039efa1 memcg: fix ugly i... |
766 |
struct mem_cgroup *mem; |
3f6c82728 mm: migration: ta... |
767 |
struct anon_vma *anon_vma = NULL; |
95a402c38 [PATCH] page migr... |
768 |
|
529ae9aaa mm: rename page t... |
769 |
if (!trylock_page(page)) { |
a6bc32b89 mm: compaction: i... |
770 |
if (!force || mode == MIGRATE_ASYNC) |
0dabec93d mm: migration: cl... |
771 |
goto out; |
3e7d34497 mm: vmscan: recla... |
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 |
/* * It's not safe for direct compaction to call lock_page. * For example, during page readahead pages are added locked * to the LRU. Later, when the IO completes the pages are * marked uptodate and unlocked. However, the queueing * could be merging multiple pages for one bio (e.g. * mpage_readpages). If an allocation happens for the * second or third page, the process can end up locking * the same page twice and deadlocking. Rather than * trying to be clever about what pages can be locked, * avoid the use of lock_page for direct compaction * altogether. */ if (current->flags & PF_MEMALLOC) |
0dabec93d mm: migration: cl... |
787 |
goto out; |
3e7d34497 mm: vmscan: recla... |
788 |
|
e24f0b8f7 [PATCH] page migr... |
789 790 |
lock_page(page); } |
01b1ae63c memcg: simple mig... |
791 |
/* charge against new page */ |
0030f535a mm: memcg: fix co... |
792 |
mem_cgroup_prepare_migration(page, newpage, &mem); |
01b1ae63c memcg: simple mig... |
793 |
|
e24f0b8f7 [PATCH] page migr... |
794 |
if (PageWriteback(page)) { |
11bc82d67 mm: compaction: U... |
795 |
/* |
fed5b64a9 mm/migrate: fix c... |
796 |
* Only in the case of a full synchronous migration is it |
a6bc32b89 mm: compaction: i... |
797 798 799 |
* necessary to wait for PageWriteback. In the async case, * the retry loop is too short and in the sync-light case, * the overhead of stalling is too much |
11bc82d67 mm: compaction: U... |
800 |
*/ |
a6bc32b89 mm: compaction: i... |
801 |
if (mode != MIGRATE_SYNC) { |
11bc82d67 mm: compaction: U... |
802 803 804 805 |
rc = -EBUSY; goto uncharge; } if (!force) |
01b1ae63c memcg: simple mig... |
806 |
goto uncharge; |
e24f0b8f7 [PATCH] page migr... |
807 808 |
wait_on_page_writeback(page); } |
e24f0b8f7 [PATCH] page migr... |
809 |
/* |
dc386d4d1 memory unplug: mi... |
810 811 |
* By try_to_unmap(), page->mapcount goes down to 0 here. In this case, * we cannot notice that anon_vma is freed while we migrates a page. |
1ce82b69e mm: fix migration... |
812 |
* This get_anon_vma() delays freeing anon_vma pointer until the end |
dc386d4d1 memory unplug: mi... |
813 |
* of migration. File cache pages are no problem because of page_lock() |
989f89c57 fix rcu_read_lock... |
814 815 |
* File Caches may use write_page() or lock_page() in migration, then, * just care Anon page here. |
dc386d4d1 memory unplug: mi... |
816 |
*/ |
b79bc0a0c ksm: enable KSM p... |
817 |
if (PageAnon(page) && !PageKsm(page)) { |
1ce82b69e mm: fix migration... |
818 |
/* |
4fc3f1d66 mm/rmap, migratio... |
819 |
* Only page_lock_anon_vma_read() understands the subtleties of |
1ce82b69e mm: fix migration... |
820 821 |
* getting a hold on an anon_vma from outside one of its mms. */ |
746b18d42 mm: use refcounts... |
822 |
anon_vma = page_get_anon_vma(page); |
1ce82b69e mm: fix migration... |
823 824 |
if (anon_vma) { /* |
746b18d42 mm: use refcounts... |
825 |
* Anon page |
1ce82b69e mm: fix migration... |
826 |
*/ |
1ce82b69e mm: fix migration... |
827 |
} else if (PageSwapCache(page)) { |
3fe2011ff mm: migration: al... |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 |
/* * We cannot be sure that the anon_vma of an unmapped * swapcache page is safe to use because we don't * know in advance if the VMA that this page belonged * to still exists. If the VMA and others sharing the * data have been freed, then the anon_vma could * already be invalid. * * To avoid this possibility, swapcache pages get * migrated but are not remapped when migration * completes */ remap_swapcache = 0; } else { |
1ce82b69e mm: fix migration... |
842 |
goto uncharge; |
3fe2011ff mm: migration: al... |
843 |
} |
989f89c57 fix rcu_read_lock... |
844 |
} |
62e1c5530 page migraton: ha... |
845 |
|
bf6bddf19 mm: introduce com... |
846 847 848 849 850 851 852 853 854 855 856 |
if (unlikely(balloon_page_movable(page))) { /* * A ballooned page does not need any special attention from * physical to virtual reverse mapping procedures. * Skip any attempt to unmap PTEs or to remap swap cache, * in order to avoid burning cycles at rmap level, and perform * the page migration right away (proteced by page lock). */ rc = balloon_page_migrate(newpage, page, mode); goto uncharge; } |
dc386d4d1 memory unplug: mi... |
857 |
/* |
62e1c5530 page migraton: ha... |
858 859 860 861 862 863 864 865 866 867 |
* Corner case handling: * 1. When a new swap-cache page is read into, it is added to the LRU * and treated as swapcache but it has no rmap yet. * Calling try_to_unmap() against a page->mapping==NULL page will * trigger a BUG. So handle it here. * 2. An orphaned page (see truncate_complete_page) might have * fs-private metadata. The page can be picked up due to memory * offlining. Everywhere else except page reclaim, the page is * invisible to the vm, so the page can not be migrated. So try to * free the metadata, so the page can be freed. |
e24f0b8f7 [PATCH] page migr... |
868 |
*/ |
62e1c5530 page migraton: ha... |
869 |
if (!page->mapping) { |
309381fea mm: dump page whe... |
870 |
VM_BUG_ON_PAGE(PageAnon(page), page); |
1ce82b69e mm: fix migration... |
871 |
if (page_has_private(page)) { |
62e1c5530 page migraton: ha... |
872 |
try_to_free_buffers(page); |
1ce82b69e mm: fix migration... |
873 |
goto uncharge; |
62e1c5530 page migraton: ha... |
874 |
} |
abfc34881 memory hotplug: m... |
875 |
goto skip_unmap; |
62e1c5530 page migraton: ha... |
876 |
} |
dc386d4d1 memory unplug: mi... |
877 |
/* Establish migration ptes or remove ptes */ |
14fa31b89 HWPOISON: Use bit... |
878 |
try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); |
dc386d4d1 memory unplug: mi... |
879 |
|
abfc34881 memory hotplug: m... |
880 |
skip_unmap: |
e6a1530d6 [PATCH] Allow mig... |
881 |
if (!page_mapped(page)) |
a6bc32b89 mm: compaction: i... |
882 |
rc = move_to_new_page(newpage, page, remap_swapcache, mode); |
e24f0b8f7 [PATCH] page migr... |
883 |
|
3fe2011ff mm: migration: al... |
884 |
if (rc && remap_swapcache) |
e24f0b8f7 [PATCH] page migr... |
885 |
remove_migration_ptes(page, page); |
3f6c82728 mm: migration: ta... |
886 887 |
/* Drop an anon_vma reference if we took one */ |
76545066c mm: extend KSM re... |
888 |
if (anon_vma) |
9e60109f1 mm: rename drop_a... |
889 |
put_anon_vma(anon_vma); |
3f6c82728 mm: migration: ta... |
890 |
|
01b1ae63c memcg: simple mig... |
891 |
uncharge: |
bf6bddf19 mm: introduce com... |
892 893 894 |
mem_cgroup_end_migration(mem, page, newpage, (rc == MIGRATEPAGE_SUCCESS || rc == MIGRATEPAGE_BALLOON_SUCCESS)); |
e24f0b8f7 [PATCH] page migr... |
895 |
unlock_page(page); |
0dabec93d mm: migration: cl... |
896 897 898 |
out: return rc; } |
95a402c38 [PATCH] page migr... |
899 |
|
0dabec93d mm: migration: cl... |
900 901 902 903 904 |
/* * Obtain the lock on page, remove all ptes and migrate the page * to the newly allocated page in newpage. */ static int unmap_and_move(new_page_t get_new_page, unsigned long private, |
9c620e2bc mm: remove offlin... |
905 |
struct page *page, int force, enum migrate_mode mode) |
0dabec93d mm: migration: cl... |
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 |
{ int rc = 0; int *result = NULL; struct page *newpage = get_new_page(page, private, &result); if (!newpage) return -ENOMEM; if (page_count(page) == 1) { /* page was freed from under us. So we are done. */ goto out; } if (unlikely(PageTransHuge(page))) if (unlikely(split_huge_page(page))) goto out; |
9c620e2bc mm: remove offlin... |
922 |
rc = __unmap_and_move(page, newpage, force, mode); |
bf6bddf19 mm: introduce com... |
923 924 925 926 927 928 929 930 931 932 933 934 |
if (unlikely(rc == MIGRATEPAGE_BALLOON_SUCCESS)) { /* * A ballooned page has been migrated already. * Now, it's the time to wrap-up counters, * handle the page back to Buddy and return. */ dec_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); balloon_page_free(page); return MIGRATEPAGE_SUCCESS; } |
0dabec93d mm: migration: cl... |
935 |
out: |
e24f0b8f7 [PATCH] page migr... |
936 |
if (rc != -EAGAIN) { |
0dabec93d mm: migration: cl... |
937 938 939 940 941 942 943 |
/* * A page that has been migrated has all references * removed and will be freed. A page that has not been * migrated will have kepts its references and be * restored. */ list_del(&page->lru); |
a731286de mm: vmstat: add i... |
944 |
dec_zone_page_state(page, NR_ISOLATED_ANON + |
6c0b13519 mm: return boolea... |
945 |
page_is_file_cache(page)); |
894bc3104 Unevictable LRU I... |
946 |
putback_lru_page(page); |
e24f0b8f7 [PATCH] page migr... |
947 |
} |
95a402c38 [PATCH] page migr... |
948 949 950 951 |
/* * Move the new page to the LRU. If migration was not successful * then this will free the page. */ |
894bc3104 Unevictable LRU I... |
952 |
putback_lru_page(newpage); |
742755a1d [PATCH] page migr... |
953 954 955 956 957 958 |
if (result) { if (rc) *result = rc; else *result = page_to_nid(newpage); } |
e24f0b8f7 [PATCH] page migr... |
959 960 961 962 |
return rc; } /* |
290408d4a hugetlb: hugepage... |
963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 |
* Counterpart of unmap_and_move_page() for hugepage migration. * * This function doesn't wait the completion of hugepage I/O * because there is no race between I/O and migration for hugepage. * Note that currently hugepage I/O occurs only in direct I/O * where no lock is held and PG_writeback is irrelevant, * and writeback status of all subpages are counted in the reference * count of the head page (i.e. if all subpages of a 2MB hugepage are * under direct I/O, the reference of the head page is 512 and a bit more.) * This means that when we try to migrate hugepage whose subpages are * doing direct I/O, some references remain after try_to_unmap() and * hugepage migration fails without data corruption. * * There is also no race when direct I/O is issued on the page under migration, * because then pte is replaced with migration swap entry and direct I/O code * will wait in the page fault for migration to complete. */ static int unmap_and_move_huge_page(new_page_t get_new_page, unsigned long private, struct page *hpage, |
9c620e2bc mm: remove offlin... |
982 |
int force, enum migrate_mode mode) |
290408d4a hugetlb: hugepage... |
983 984 985 |
{ int rc = 0; int *result = NULL; |
32665f2bb mm/migrate: corre... |
986 |
struct page *new_hpage; |
290408d4a hugetlb: hugepage... |
987 |
struct anon_vma *anon_vma = NULL; |
83467efbd mm: migrate: chec... |
988 989 990 991 992 993 994 |
/* * Movability of hugepages depends on architectures and hugepage size. * This check is necessary because some callers of hugepage migration * like soft offline and memory hotremove don't walk through page * tables or check whether the hugepage is pmd-based or not before * kicking migration. */ |
32665f2bb mm/migrate: corre... |
995 996 |
if (!hugepage_migration_support(page_hstate(hpage))) { putback_active_hugepage(hpage); |
83467efbd mm: migrate: chec... |
997 |
return -ENOSYS; |
32665f2bb mm/migrate: corre... |
998 |
} |
83467efbd mm: migrate: chec... |
999 |
|
32665f2bb mm/migrate: corre... |
1000 |
new_hpage = get_new_page(hpage, private, &result); |
290408d4a hugetlb: hugepage... |
1001 1002 1003 1004 1005 1006 |
if (!new_hpage) return -ENOMEM; rc = -EAGAIN; if (!trylock_page(hpage)) { |
a6bc32b89 mm: compaction: i... |
1007 |
if (!force || mode != MIGRATE_SYNC) |
290408d4a hugetlb: hugepage... |
1008 1009 1010 |
goto out; lock_page(hpage); } |
746b18d42 mm: use refcounts... |
1011 1012 |
if (PageAnon(hpage)) anon_vma = page_get_anon_vma(hpage); |
290408d4a hugetlb: hugepage... |
1013 1014 1015 1016 |
try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); if (!page_mapped(hpage)) |
a6bc32b89 mm: compaction: i... |
1017 |
rc = move_to_new_page(new_hpage, hpage, 1, mode); |
290408d4a hugetlb: hugepage... |
1018 1019 1020 |
if (rc) remove_migration_ptes(hpage, hpage); |
fd4a4663d mm: fix hugepage ... |
1021 |
if (anon_vma) |
9e60109f1 mm: rename drop_a... |
1022 |
put_anon_vma(anon_vma); |
8e6ac7fab hugetlb/cgroup: m... |
1023 1024 1025 |
if (!rc) hugetlb_cgroup_migrate(hpage, new_hpage); |
290408d4a hugetlb: hugepage... |
1026 |
unlock_page(hpage); |
09761333e mm/migrate.c: pai... |
1027 |
out: |
b8ec1cee5 mm: soft-offline:... |
1028 1029 |
if (rc != -EAGAIN) putback_active_hugepage(hpage); |
290408d4a hugetlb: hugepage... |
1030 |
put_page(new_hpage); |
290408d4a hugetlb: hugepage... |
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 |
if (result) { if (rc) *result = rc; else *result = page_to_nid(new_hpage); } return rc; } /* |
c73e5c9c5 mm: rewrite the c... |
1041 1042 |
* migrate_pages - migrate the pages specified in a list, to the free pages * supplied as the target for the page migration |
b20a35035 [PATCH] page migr... |
1043 |
* |
c73e5c9c5 mm: rewrite the c... |
1044 1045 1046 1047 1048 1049 1050 |
* @from: The list of pages to be migrated. * @get_new_page: The function used to allocate free pages to be used * as the target of the page migration. * @private: Private data to be passed on to get_new_page() * @mode: The migration mode that specifies the constraints for * page migration, if any. * @reason: The reason for page migration. |
b20a35035 [PATCH] page migr... |
1051 |
* |
c73e5c9c5 mm: rewrite the c... |
1052 1053 1054 |
* The function returns after 10 attempts or if no pages are movable any more * because the list has become empty or no retryable pages exist any more. * The caller should call putback_lru_pages() to return pages to the LRU |
28bd65781 mm: migration: cl... |
1055 |
* or free list only if ret != 0. |
b20a35035 [PATCH] page migr... |
1056 |
* |
c73e5c9c5 mm: rewrite the c... |
1057 |
* Returns the number of pages that were not migrated, or an error code. |
b20a35035 [PATCH] page migr... |
1058 |
*/ |
9c620e2bc mm: remove offlin... |
1059 1060 |
int migrate_pages(struct list_head *from, new_page_t get_new_page, unsigned long private, enum migrate_mode mode, int reason) |
b20a35035 [PATCH] page migr... |
1061 |
{ |
e24f0b8f7 [PATCH] page migr... |
1062 |
int retry = 1; |
b20a35035 [PATCH] page migr... |
1063 |
int nr_failed = 0; |
5647bc293 mm: compaction: M... |
1064 |
int nr_succeeded = 0; |
b20a35035 [PATCH] page migr... |
1065 1066 1067 1068 1069 1070 1071 1072 |
int pass = 0; struct page *page; struct page *page2; int swapwrite = current->flags & PF_SWAPWRITE; int rc; if (!swapwrite) current->flags |= PF_SWAPWRITE; |
e24f0b8f7 [PATCH] page migr... |
1073 1074 |
for(pass = 0; pass < 10 && retry; pass++) { retry = 0; |
b20a35035 [PATCH] page migr... |
1075 |
|
e24f0b8f7 [PATCH] page migr... |
1076 |
list_for_each_entry_safe(page, page2, from, lru) { |
e24f0b8f7 [PATCH] page migr... |
1077 |
cond_resched(); |
2d1db3b11 [PATCH] page migr... |
1078 |
|
31caf665e mm: migrate: make... |
1079 1080 1081 1082 1083 |
if (PageHuge(page)) rc = unmap_and_move_huge_page(get_new_page, private, page, pass > 2, mode); else rc = unmap_and_move(get_new_page, private, |
9c620e2bc mm: remove offlin... |
1084 |
page, pass > 2, mode); |
2d1db3b11 [PATCH] page migr... |
1085 |
|
e24f0b8f7 [PATCH] page migr... |
1086 |
switch(rc) { |
95a402c38 [PATCH] page migr... |
1087 1088 |
case -ENOMEM: goto out; |
e24f0b8f7 [PATCH] page migr... |
1089 |
case -EAGAIN: |
2d1db3b11 [PATCH] page migr... |
1090 |
retry++; |
e24f0b8f7 [PATCH] page migr... |
1091 |
break; |
78bd52097 mm: adjust addres... |
1092 |
case MIGRATEPAGE_SUCCESS: |
5647bc293 mm: compaction: M... |
1093 |
nr_succeeded++; |
e24f0b8f7 [PATCH] page migr... |
1094 1095 |
break; default: |
354a33633 mm/migrate: add c... |
1096 1097 1098 1099 1100 1101 |
/* * Permanent failure (-EBUSY, -ENOSYS, etc.): * unlike -EAGAIN case, the failed page is * removed from migration page list and not * retried in the next outer loop. */ |
2d1db3b11 [PATCH] page migr... |
1102 |
nr_failed++; |
e24f0b8f7 [PATCH] page migr... |
1103 |
break; |
2d1db3b11 [PATCH] page migr... |
1104 |
} |
b20a35035 [PATCH] page migr... |
1105 1106 |
} } |
78bd52097 mm: adjust addres... |
1107 |
rc = nr_failed + retry; |
95a402c38 [PATCH] page migr... |
1108 |
out: |
5647bc293 mm: compaction: M... |
1109 1110 1111 1112 |
if (nr_succeeded) count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded); if (nr_failed) count_vm_events(PGMIGRATE_FAIL, nr_failed); |
7b2a2d4a1 mm: migrate: Add ... |
1113 |
trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason); |
b20a35035 [PATCH] page migr... |
1114 1115 |
if (!swapwrite) current->flags &= ~PF_SWAPWRITE; |
78bd52097 mm: adjust addres... |
1116 |
return rc; |
b20a35035 [PATCH] page migr... |
1117 |
} |
95a402c38 [PATCH] page migr... |
1118 |
|
742755a1d [PATCH] page migr... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
#ifdef CONFIG_NUMA /* * Move a list of individual pages */ 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; |
e632a938d mm: migrate: add ... |
1142 1143 1144 1145 1146 |
if (PageHuge(p)) return alloc_huge_page_node(page_hstate(compound_head(p)), pm->node); else return alloc_pages_exact_node(pm->node, |
e97ca8e5b mm: fix GFP_THISN... |
1147 |
GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0); |
742755a1d [PATCH] page migr... |
1148 1149 1150 1151 1152 1153 |
} /* * Move a set of pages as indicated in the pm array. The addr * field must be set to the virtual address of the page to be moved * and the node number must contain a valid target node. |
5e9a0f023 mm: extract do_pa... |
1154 |
* The pm array ends with node = MAX_NUMNODES. |
742755a1d [PATCH] page migr... |
1155 |
*/ |
5e9a0f023 mm: extract do_pa... |
1156 1157 1158 |
static int do_move_page_to_node_array(struct mm_struct *mm, struct page_to_node *pm, int migrate_all) |
742755a1d [PATCH] page migr... |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 |
{ int err; struct page_to_node *pp; LIST_HEAD(pagelist); down_read(&mm->mmap_sem); /* * Build a list of pages to migrate */ |
742755a1d [PATCH] page migr... |
1169 1170 1171 |
for (pp = pm; pp->node != MAX_NUMNODES; pp++) { struct vm_area_struct *vma; struct page *page; |
742755a1d [PATCH] page migr... |
1172 1173 |
err = -EFAULT; vma = find_vma(mm, pp->addr); |
70384dc6d mm: fix error rep... |
1174 |
if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma)) |
742755a1d [PATCH] page migr... |
1175 |
goto set_status; |
500d65d47 thp: pmd_trans_hu... |
1176 |
page = follow_page(vma, pp->addr, FOLL_GET|FOLL_SPLIT); |
89f5b7da2 Reinstate ZERO_PA... |
1177 1178 1179 1180 |
err = PTR_ERR(page); if (IS_ERR(page)) goto set_status; |
742755a1d [PATCH] page migr... |
1181 1182 1183 |
err = -ENOENT; if (!page) goto set_status; |
62b61f611 ksm: memory hotre... |
1184 |
/* Use PageReserved to check for zero page */ |
b79bc0a0c ksm: enable KSM p... |
1185 |
if (PageReserved(page)) |
742755a1d [PATCH] page migr... |
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 |
goto put_and_set; pp->page = page; err = page_to_nid(page); if (err == pp->node) /* * Node already in the right place */ goto put_and_set; err = -EACCES; if (page_mapcount(page) > 1 && !migrate_all) goto put_and_set; |
e632a938d mm: migrate: add ... |
1201 1202 1203 1204 |
if (PageHuge(page)) { isolate_huge_page(page, &pagelist); goto put_and_set; } |
62695a84e vmscan: move isol... |
1205 |
err = isolate_lru_page(page); |
6d9c285a6 mm: move inc_zone... |
1206 |
if (!err) { |
62695a84e vmscan: move isol... |
1207 |
list_add_tail(&page->lru, &pagelist); |
6d9c285a6 mm: move inc_zone... |
1208 1209 1210 |
inc_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); } |
742755a1d [PATCH] page migr... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 |
put_and_set: /* * Either remove the duplicate refcount from * isolate_lru_page() or drop the page ref if it was * not isolated. */ put_page(page); set_status: pp->status = err; } |
e78bbfa82 mm: stop returnin... |
1221 |
err = 0; |
cf608ac19 mm: compaction: f... |
1222 |
if (!list_empty(&pagelist)) { |
742755a1d [PATCH] page migr... |
1223 |
err = migrate_pages(&pagelist, new_page_node, |
9c620e2bc mm: remove offlin... |
1224 |
(unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL); |
cf608ac19 mm: compaction: f... |
1225 |
if (err) |
e632a938d mm: migrate: add ... |
1226 |
putback_movable_pages(&pagelist); |
cf608ac19 mm: compaction: f... |
1227 |
} |
742755a1d [PATCH] page migr... |
1228 1229 1230 1231 1232 1233 |
up_read(&mm->mmap_sem); return err; } /* |
5e9a0f023 mm: extract do_pa... |
1234 1235 1236 |
* Migrate an array of page address onto an array of nodes and fill * the corresponding array of status. */ |
3268c63ed mm: fix move/migr... |
1237 |
static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, |
5e9a0f023 mm: extract do_pa... |
1238 1239 1240 1241 1242 |
unsigned long nr_pages, const void __user * __user *pages, const int __user *nodes, int __user *status, int flags) { |
3140a2273 mm: rework do_pag... |
1243 |
struct page_to_node *pm; |
3140a2273 mm: rework do_pag... |
1244 1245 1246 |
unsigned long chunk_nr_pages; unsigned long chunk_start; int err; |
5e9a0f023 mm: extract do_pa... |
1247 |
|
3140a2273 mm: rework do_pag... |
1248 1249 1250 |
err = -ENOMEM; pm = (struct page_to_node *)__get_free_page(GFP_KERNEL); if (!pm) |
5e9a0f023 mm: extract do_pa... |
1251 |
goto out; |
35282a2de migration: only m... |
1252 1253 |
migrate_prep(); |
5e9a0f023 mm: extract do_pa... |
1254 |
/* |
3140a2273 mm: rework do_pag... |
1255 1256 |
* Store a chunk of page_to_node array in a page, * but keep the last one as a marker |
5e9a0f023 mm: extract do_pa... |
1257 |
*/ |
3140a2273 mm: rework do_pag... |
1258 |
chunk_nr_pages = (PAGE_SIZE / sizeof(struct page_to_node)) - 1; |
5e9a0f023 mm: extract do_pa... |
1259 |
|
3140a2273 mm: rework do_pag... |
1260 1261 1262 1263 |
for (chunk_start = 0; chunk_start < nr_pages; chunk_start += chunk_nr_pages) { int j; |
5e9a0f023 mm: extract do_pa... |
1264 |
|
3140a2273 mm: rework do_pag... |
1265 1266 1267 1268 1269 1270 |
if (chunk_start + chunk_nr_pages > nr_pages) chunk_nr_pages = nr_pages - chunk_start; /* fill the chunk pm with addrs and nodes from user-space */ for (j = 0; j < chunk_nr_pages; j++) { const void __user *p; |
5e9a0f023 mm: extract do_pa... |
1271 |
int node; |
3140a2273 mm: rework do_pag... |
1272 1273 1274 1275 1276 1277 |
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)) |
5e9a0f023 mm: extract do_pa... |
1278 1279 1280 |
goto out_pm; err = -ENODEV; |
6f5a55f1a Fix potential cra... |
1281 1282 |
if (node < 0 || node >= MAX_NUMNODES) goto out_pm; |
389162c22 mm,migrate: use N... |
1283 |
if (!node_state(node, N_MEMORY)) |
5e9a0f023 mm: extract do_pa... |
1284 1285 1286 1287 1288 |
goto out_pm; err = -EACCES; if (!node_isset(node, task_nodes)) goto out_pm; |
3140a2273 mm: rework do_pag... |
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 |
pm[j].node = node; } /* End marker for this chunk */ pm[chunk_nr_pages].node = MAX_NUMNODES; /* Migrate this chunk */ err = do_move_page_to_node_array(mm, pm, flags & MPOL_MF_MOVE_ALL); if (err < 0) goto out_pm; |
5e9a0f023 mm: extract do_pa... |
1300 |
|
5e9a0f023 mm: extract do_pa... |
1301 |
/* Return status information */ |
3140a2273 mm: rework do_pag... |
1302 1303 |
for (j = 0; j < chunk_nr_pages; j++) if (put_user(pm[j].status, status + j + chunk_start)) { |
5e9a0f023 mm: extract do_pa... |
1304 |
err = -EFAULT; |
3140a2273 mm: rework do_pag... |
1305 1306 1307 1308 |
goto out_pm; } } err = 0; |
5e9a0f023 mm: extract do_pa... |
1309 1310 |
out_pm: |
3140a2273 mm: rework do_pag... |
1311 |
free_page((unsigned long)pm); |
5e9a0f023 mm: extract do_pa... |
1312 1313 1314 1315 1316 |
out: return err; } /* |
2f007e74b mm: don't vmalloc... |
1317 |
* Determine the nodes of an array of pages and store it in an array of status. |
742755a1d [PATCH] page migr... |
1318 |
*/ |
80bba1290 mm: no get_user/p... |
1319 1320 |
static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages, const void __user **pages, int *status) |
742755a1d [PATCH] page migr... |
1321 |
{ |
2f007e74b mm: don't vmalloc... |
1322 |
unsigned long i; |
2f007e74b mm: don't vmalloc... |
1323 |
|
742755a1d [PATCH] page migr... |
1324 |
down_read(&mm->mmap_sem); |
2f007e74b mm: don't vmalloc... |
1325 |
for (i = 0; i < nr_pages; i++) { |
80bba1290 mm: no get_user/p... |
1326 |
unsigned long addr = (unsigned long)(*pages); |
742755a1d [PATCH] page migr... |
1327 1328 |
struct vm_area_struct *vma; struct page *page; |
c095adbc2 mm: Don't touch u... |
1329 |
int err = -EFAULT; |
2f007e74b mm: don't vmalloc... |
1330 1331 |
vma = find_vma(mm, addr); |
70384dc6d mm: fix error rep... |
1332 |
if (!vma || addr < vma->vm_start) |
742755a1d [PATCH] page migr... |
1333 |
goto set_status; |
2f007e74b mm: don't vmalloc... |
1334 |
page = follow_page(vma, addr, 0); |
89f5b7da2 Reinstate ZERO_PA... |
1335 1336 1337 1338 |
err = PTR_ERR(page); if (IS_ERR(page)) goto set_status; |
742755a1d [PATCH] page migr... |
1339 1340 |
err = -ENOENT; /* Use PageReserved to check for zero page */ |
b79bc0a0c ksm: enable KSM p... |
1341 |
if (!page || PageReserved(page)) |
742755a1d [PATCH] page migr... |
1342 1343 1344 1345 |
goto set_status; err = page_to_nid(page); set_status: |
80bba1290 mm: no get_user/p... |
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 |
*status = err; pages++; status++; } up_read(&mm->mmap_sem); } /* * Determine the nodes of a user array of pages and store it in * a user array of status. */ 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]; |
80bba1290 mm: no get_user/p... |
1366 |
|
87b8d1ade mm: Make copy_fro... |
1367 1368 |
while (nr_pages) { unsigned long chunk_nr; |
80bba1290 mm: no get_user/p... |
1369 |
|
87b8d1ade mm: Make copy_fro... |
1370 1371 1372 1373 1374 1375 |
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; |
80bba1290 mm: no get_user/p... |
1376 1377 |
do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status); |
87b8d1ade mm: Make copy_fro... |
1378 1379 |
if (copy_to_user(status, chunk_status, chunk_nr * sizeof(*status))) break; |
742755a1d [PATCH] page migr... |
1380 |
|
87b8d1ade mm: Make copy_fro... |
1381 1382 1383 1384 1385 |
pages += chunk_nr; status += chunk_nr; nr_pages -= chunk_nr; } return nr_pages ? -EFAULT : 0; |
742755a1d [PATCH] page migr... |
1386 1387 1388 1389 1390 1391 |
} /* * Move a list of pages in the address space of the currently executing * process. */ |
938bb9f5e [CVE-2009-0029] S... |
1392 1393 1394 1395 |
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) |
742755a1d [PATCH] page migr... |
1396 |
{ |
c69e8d9c0 CRED: Use RCU to ... |
1397 |
const struct cred *cred = current_cred(), *tcred; |
742755a1d [PATCH] page migr... |
1398 |
struct task_struct *task; |
742755a1d [PATCH] page migr... |
1399 |
struct mm_struct *mm; |
5e9a0f023 mm: extract do_pa... |
1400 |
int err; |
3268c63ed mm: fix move/migr... |
1401 |
nodemask_t task_nodes; |
742755a1d [PATCH] page migr... |
1402 1403 1404 1405 1406 1407 1408 1409 1410 |
/* Check flags */ if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL)) return -EINVAL; if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) return -EPERM; /* Find the mm_struct */ |
a879bf582 mm: grab rcu read... |
1411 |
rcu_read_lock(); |
228ebcbe6 Uninline find_tas... |
1412 |
task = pid ? find_task_by_vpid(pid) : current; |
742755a1d [PATCH] page migr... |
1413 |
if (!task) { |
a879bf582 mm: grab rcu read... |
1414 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1415 1416 |
return -ESRCH; } |
3268c63ed mm: fix move/migr... |
1417 |
get_task_struct(task); |
742755a1d [PATCH] page migr... |
1418 1419 1420 1421 1422 1423 1424 |
/* * Check if this process has the right to modify the specified * process. The right exists if the process has administrative * capabilities, superuser privileges or the same * userid as the target process. */ |
c69e8d9c0 CRED: Use RCU to ... |
1425 |
tcred = __task_cred(task); |
b38a86eb1 userns: Convert t... |
1426 1427 |
if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) && !uid_eq(cred->uid, tcred->suid) && !uid_eq(cred->uid, tcred->uid) && |
742755a1d [PATCH] page migr... |
1428 |
!capable(CAP_SYS_NICE)) { |
c69e8d9c0 CRED: Use RCU to ... |
1429 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1430 |
err = -EPERM; |
5e9a0f023 mm: extract do_pa... |
1431 |
goto out; |
742755a1d [PATCH] page migr... |
1432 |
} |
c69e8d9c0 CRED: Use RCU to ... |
1433 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1434 |
|
86c3a7645 [PATCH] SELinux: ... |
1435 1436 |
err = security_task_movememory(task); if (err) |
5e9a0f023 mm: extract do_pa... |
1437 |
goto out; |
86c3a7645 [PATCH] SELinux: ... |
1438 |
|
3268c63ed mm: fix move/migr... |
1439 1440 1441 |
task_nodes = cpuset_mems_allowed(task); mm = get_task_mm(task); put_task_struct(task); |
6e8b09eaf mm: fix NULL ptr ... |
1442 1443 1444 1445 1446 1447 1448 1449 |
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); |
742755a1d [PATCH] page migr... |
1450 |
|
742755a1d [PATCH] page migr... |
1451 1452 |
mmput(mm); return err; |
3268c63ed mm: fix move/migr... |
1453 1454 1455 1456 |
out: put_task_struct(task); return err; |
742755a1d [PATCH] page migr... |
1457 |
} |
742755a1d [PATCH] page migr... |
1458 |
|
7b2259b3e [PATCH] page migr... |
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 |
/* * Call migration functions in the vma_ops that may prepare * memory in a vm for migration. migration functions may perform * the migration for vmas that do not have an underlying page struct. */ int migrate_vmas(struct mm_struct *mm, const nodemask_t *to, const nodemask_t *from, unsigned long flags) { struct vm_area_struct *vma; int err = 0; |
1001c9fb8 migration: migrat... |
1469 |
for (vma = mm->mmap; vma && !err; vma = vma->vm_next) { |
7b2259b3e [PATCH] page migr... |
1470 1471 1472 1473 1474 1475 1476 1477 |
if (vma->vm_ops && vma->vm_ops->migrate) { err = vma->vm_ops->migrate(vma, to, from, flags); if (err) break; } } return err; } |
7039e1dbe mm: migrate: Intr... |
1478 1479 1480 1481 1482 1483 1484 |
#ifdef CONFIG_NUMA_BALANCING /* * Returns true if this is a safe migration target node for misplaced NUMA * pages. Currently it only checks the watermarks which crude */ static bool migrate_balanced_pgdat(struct pglist_data *pgdat, |
3abef4e6c mm: numa: take TH... |
1485 |
unsigned long nr_migrate_pages) |
7039e1dbe mm: migrate: Intr... |
1486 1487 1488 1489 1490 1491 1492 |
{ int z; for (z = pgdat->nr_zones - 1; z >= 0; z--) { struct zone *zone = pgdat->node_zones + z; if (!populated_zone(zone)) continue; |
6e543d578 mm: vmscan: fix d... |
1493 |
if (!zone_reclaimable(zone)) |
7039e1dbe mm: migrate: Intr... |
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 |
continue; /* Avoid waking kswapd by allocating pages_to_migrate pages. */ 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_exact_node(nid, |
e97ca8e5b mm: fix GFP_THISN... |
1515 1516 1517 |
(GFP_HIGHUSER_MOVABLE | __GFP_THISNODE | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & |
7039e1dbe mm: migrate: Intr... |
1518 |
~GFP_IOFS, 0); |
bac0382c6 mm: numa: migrate... |
1519 |
|
7039e1dbe mm: migrate: Intr... |
1520 1521 1522 1523 |
return newpage; } /* |
a8f607721 mm: numa: Rate li... |
1524 1525 1526 |
* page migration rate limiting control. * Do not migrate more than @pages_to_migrate in a @migrate_interval_millisecs * window of time. Default here says do not migrate more than 1280M per second. |
e14808b49 mm: numa: Rate li... |
1527 1528 1529 1530 |
* If a node is rate-limited then PTE NUMA updates are also rate-limited. However * as it is faults that reset the window, pte updates will happen unconditionally * if there has not been a fault since @pteupdate_interval_millisecs after the * throttle window closed. |
a8f607721 mm: numa: Rate li... |
1531 1532 |
*/ static unsigned int migrate_interval_millisecs __read_mostly = 100; |
e14808b49 mm: numa: Rate li... |
1533 |
static unsigned int pteupdate_interval_millisecs __read_mostly = 1000; |
a8f607721 mm: numa: Rate li... |
1534 |
static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT); |
e14808b49 mm: numa: Rate li... |
1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 |
/* Returns true if NUMA migration is currently rate limited */ bool migrate_ratelimited(int node) { pg_data_t *pgdat = NODE_DATA(node); if (time_after(jiffies, pgdat->numabalancing_migrate_next_window + msecs_to_jiffies(pteupdate_interval_millisecs))) return false; if (pgdat->numabalancing_migrate_nr_pages < ratelimit_pages) return false; return true; } |
b32967ff1 mm: numa: Add THP... |
1549 |
/* Returns true if the node is migrate rate-limited after the update */ |
1c30e0177 mm: numa: make NU... |
1550 1551 |
static bool numamigrate_update_ratelimit(pg_data_t *pgdat, unsigned long nr_pages) |
7039e1dbe mm: migrate: Intr... |
1552 |
{ |
a8f607721 mm: numa: Rate li... |
1553 1554 1555 1556 1557 |
/* * Rate-limit the amount of data that is being migrated to a node. * Optimal placement is no good if the memory bus is saturated and * all the time is being spent migrating! */ |
a8f607721 mm: numa: Rate li... |
1558 |
if (time_after(jiffies, pgdat->numabalancing_migrate_next_window)) { |
1c5e9c27c mm: numa: limit s... |
1559 |
spin_lock(&pgdat->numabalancing_migrate_lock); |
a8f607721 mm: numa: Rate li... |
1560 1561 1562 |
pgdat->numabalancing_migrate_nr_pages = 0; pgdat->numabalancing_migrate_next_window = jiffies + msecs_to_jiffies(migrate_interval_millisecs); |
1c5e9c27c mm: numa: limit s... |
1563 |
spin_unlock(&pgdat->numabalancing_migrate_lock); |
a8f607721 mm: numa: Rate li... |
1564 |
} |
af1839d72 mm: numa: trace t... |
1565 1566 1567 |
if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) { trace_mm_numa_migrate_ratelimit(current, pgdat->node_id, nr_pages); |
1c5e9c27c mm: numa: limit s... |
1568 |
return true; |
af1839d72 mm: numa: trace t... |
1569 |
} |
1c5e9c27c mm: numa: limit s... |
1570 1571 1572 1573 1574 1575 1576 1577 1578 |
/* * This is an unlocked non-atomic update so errors are possible. * The consequences are failing to migrate when we potentiall should * have which is not severe enough to warrant locking. If it is ever * a problem, it can be converted to a per-cpu counter. */ pgdat->numabalancing_migrate_nr_pages += nr_pages; return false; |
b32967ff1 mm: numa: Add THP... |
1579 |
} |
1c30e0177 mm: numa: make NU... |
1580 |
static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) |
b32967ff1 mm: numa: Add THP... |
1581 |
{ |
340ef3902 mm: numa: cleanup... |
1582 |
int page_lru; |
a8f607721 mm: numa: Rate li... |
1583 |
|
309381fea mm: dump page whe... |
1584 |
VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page); |
3abef4e6c mm: numa: take TH... |
1585 |
|
7039e1dbe mm: migrate: Intr... |
1586 |
/* Avoid migrating to a node that is nearly full */ |
340ef3902 mm: numa: cleanup... |
1587 1588 |
if (!migrate_balanced_pgdat(pgdat, 1UL << compound_order(page))) return 0; |
7039e1dbe mm: migrate: Intr... |
1589 |
|
340ef3902 mm: numa: cleanup... |
1590 1591 |
if (isolate_lru_page(page)) return 0; |
7039e1dbe mm: migrate: Intr... |
1592 |
|
340ef3902 mm: numa: cleanup... |
1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 |
/* * migrate_misplaced_transhuge_page() skips page migration's usual * check on page_count(), so we must do it here, now that the page * has been isolated: a GUP pin, or any other pin, prevents migration. * The expected page count is 3: 1 for page's mapcount and 1 for the * caller's pin and 1 for the reference taken by isolate_lru_page(). */ if (PageTransHuge(page) && page_count(page) != 3) { putback_lru_page(page); return 0; |
7039e1dbe mm: migrate: Intr... |
1603 |
} |
340ef3902 mm: numa: cleanup... |
1604 1605 1606 |
page_lru = page_is_file_cache(page); mod_zone_page_state(page_zone(page), NR_ISOLATED_ANON + page_lru, hpage_nr_pages(page)); |
149c33e1c mm: migrate: Drop... |
1607 |
/* |
340ef3902 mm: numa: cleanup... |
1608 1609 1610 |
* Isolating the page has taken another reference, so the * caller's reference can be safely dropped without the page * disappearing underneath us during migration. |
149c33e1c mm: migrate: Drop... |
1611 1612 |
*/ put_page(page); |
340ef3902 mm: numa: cleanup... |
1613 |
return 1; |
b32967ff1 mm: numa: Add THP... |
1614 |
} |
de466bd62 mm: numa: avoid u... |
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 |
bool pmd_trans_migrating(pmd_t pmd) { struct page *page = pmd_page(pmd); return PageLocked(page); } void wait_migrate_huge_page(struct anon_vma *anon_vma, pmd_t *pmd) { struct page *page = pmd_page(*pmd); wait_on_page_locked(page); } |
b32967ff1 mm: numa: Add THP... |
1626 1627 1628 1629 1630 |
/* * Attempt to migrate a misplaced page to the specified destination * node. Caller is expected to have an elevated reference count on * the page that will be dropped by this function before returning. */ |
1bc115d87 mm: numa: Scan pa... |
1631 1632 |
int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma, int node) |
b32967ff1 mm: numa: Add THP... |
1633 1634 |
{ pg_data_t *pgdat = NODE_DATA(node); |
340ef3902 mm: numa: cleanup... |
1635 |
int isolated; |
b32967ff1 mm: numa: Add THP... |
1636 1637 1638 1639 |
int nr_remaining; LIST_HEAD(migratepages); /* |
1bc115d87 mm: numa: Scan pa... |
1640 1641 |
* Don't migrate file pages that are mapped in multiple processes * with execute permissions as they are probably shared libraries. |
b32967ff1 mm: numa: Add THP... |
1642 |
*/ |
1bc115d87 mm: numa: Scan pa... |
1643 1644 |
if (page_mapcount(page) != 1 && page_is_file_cache(page) && (vma->vm_flags & VM_EXEC)) |
b32967ff1 mm: numa: Add THP... |
1645 |
goto out; |
b32967ff1 mm: numa: Add THP... |
1646 1647 1648 1649 1650 1651 |
/* * Rate-limit the amount of data that is being migrated to a node. * Optimal placement is no good if the memory bus is saturated and * all the time is being spent migrating! */ |
340ef3902 mm: numa: cleanup... |
1652 |
if (numamigrate_update_ratelimit(pgdat, 1)) |
b32967ff1 mm: numa: Add THP... |
1653 |
goto out; |
b32967ff1 mm: numa: Add THP... |
1654 1655 1656 1657 1658 1659 |
isolated = numamigrate_isolate_page(pgdat, page); if (!isolated) goto out; list_add(&page->lru, &migratepages); |
9c620e2bc mm: remove offlin... |
1660 1661 |
nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page, node, MIGRATE_ASYNC, MR_NUMA_MISPLACED); |
b32967ff1 mm: numa: Add THP... |
1662 |
if (nr_remaining) { |
59c82b70d mm/migrate: remov... |
1663 1664 1665 1666 1667 1668 |
if (!list_empty(&migratepages)) { list_del(&page->lru); dec_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); putback_lru_page(page); } |
b32967ff1 mm: numa: Add THP... |
1669 1670 1671 |
isolated = 0; } else count_vm_numa_event(NUMA_PAGE_MIGRATE); |
7039e1dbe mm: migrate: Intr... |
1672 |
BUG_ON(!list_empty(&migratepages)); |
7039e1dbe mm: migrate: Intr... |
1673 |
return isolated; |
340ef3902 mm: numa: cleanup... |
1674 1675 1676 1677 |
out: put_page(page); return 0; |
7039e1dbe mm: migrate: Intr... |
1678 |
} |
220018d38 mm: numa: Add THP... |
1679 |
#endif /* CONFIG_NUMA_BALANCING */ |
b32967ff1 mm: numa: Add THP... |
1680 |
|
220018d38 mm: numa: Add THP... |
1681 |
#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
340ef3902 mm: numa: cleanup... |
1682 1683 1684 1685 |
/* * Migrates a THP to a given target node. page must be locked and is unlocked * before returning. */ |
b32967ff1 mm: numa: Add THP... |
1686 1687 1688 1689 1690 1691 |
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) { |
c4088ebdc mm: convert the r... |
1692 |
spinlock_t *ptl; |
b32967ff1 mm: numa: Add THP... |
1693 1694 1695 1696 1697 |
pg_data_t *pgdat = NODE_DATA(node); int isolated = 0; struct page *new_page = NULL; struct mem_cgroup *memcg = NULL; int page_lru = page_is_file_cache(page); |
f714f4f20 mm: numa: call MM... |
1698 1699 |
unsigned long mmun_start = address & HPAGE_PMD_MASK; unsigned long mmun_end = mmun_start + HPAGE_PMD_SIZE; |
2b4847e73 mm: numa: seriali... |
1700 |
pmd_t orig_entry; |
b32967ff1 mm: numa: Add THP... |
1701 1702 |
/* |
b32967ff1 mm: numa: Add THP... |
1703 1704 1705 1706 |
* Rate-limit the amount of data that is being migrated to a node. * Optimal placement is no good if the memory bus is saturated and * all the time is being spent migrating! */ |
d28d43351 mm: migrate: Acco... |
1707 |
if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR)) |
b32967ff1 mm: numa: Add THP... |
1708 1709 1710 |
goto out_dropref; new_page = alloc_pages_node(node, |
e97ca8e5b mm: fix GFP_THISN... |
1711 1712 |
(GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_WAIT, HPAGE_PMD_ORDER); |
340ef3902 mm: numa: cleanup... |
1713 1714 |
if (!new_page) goto out_fail; |
b32967ff1 mm: numa: Add THP... |
1715 |
isolated = numamigrate_isolate_page(pgdat, page); |
340ef3902 mm: numa: cleanup... |
1716 |
if (!isolated) { |
b32967ff1 mm: numa: Add THP... |
1717 |
put_page(new_page); |
340ef3902 mm: numa: cleanup... |
1718 |
goto out_fail; |
b32967ff1 mm: numa: Add THP... |
1719 |
} |
b0943d61b mm: numa: defer T... |
1720 1721 |
if (mm_tlb_flush_pending(mm)) flush_tlb_range(vma, mmun_start, mmun_end); |
b32967ff1 mm: numa: Add THP... |
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 |
/* Prepare a page as a migration target */ __set_page_locked(new_page); SetPageSwapBacked(new_page); /* anon mapping, we can simply copy page->mapping to the new page: */ new_page->mapping = page->mapping; new_page->index = page->index; migrate_page_copy(new_page, page); WARN_ON(PageLRU(new_page)); /* Recheck the target PMD */ |
f714f4f20 mm: numa: call MM... |
1733 |
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); |
c4088ebdc mm: convert the r... |
1734 |
ptl = pmd_lock(mm, pmd); |
2b4847e73 mm: numa: seriali... |
1735 1736 |
if (unlikely(!pmd_same(*pmd, entry) || page_count(page) != 2)) { fail_putback: |
c4088ebdc mm: convert the r... |
1737 |
spin_unlock(ptl); |
f714f4f20 mm: numa: call MM... |
1738 |
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
b32967ff1 mm: numa: Add THP... |
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
/* Reverse changes made by migrate_page_copy() */ if (TestClearPageActive(new_page)) SetPageActive(page); if (TestClearPageUnevictable(new_page)) SetPageUnevictable(page); mlock_migrate_page(page, new_page); unlock_page(new_page); put_page(new_page); /* Free it */ |
a54a407fb mm: Close races b... |
1749 1750 |
/* Retake the callers reference and putback on LRU */ get_page(page); |
b32967ff1 mm: numa: Add THP... |
1751 |
putback_lru_page(page); |
a54a407fb mm: Close races b... |
1752 1753 |
mod_zone_page_state(page_zone(page), NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR); |
eb4489f69 mm: numa: avoid u... |
1754 1755 |
goto out_unlock; |
b32967ff1 mm: numa: Add THP... |
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 |
} /* * Traditional migration needs to prepare the memcg charge * transaction early to prevent the old page from being * uncharged when installing migration entries. Here we can * save the potential rollback and start the charge transfer * only when migration is already known to end successfully. */ mem_cgroup_prepare_migration(page, new_page, &memcg); |
2b4847e73 mm: numa: seriali... |
1766 |
orig_entry = *pmd; |
b32967ff1 mm: numa: Add THP... |
1767 |
entry = mk_pmd(new_page, vma->vm_page_prot); |
b32967ff1 mm: numa: Add THP... |
1768 |
entry = pmd_mkhuge(entry); |
2b4847e73 mm: numa: seriali... |
1769 |
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); |
b32967ff1 mm: numa: Add THP... |
1770 |
|
2b4847e73 mm: numa: seriali... |
1771 1772 1773 1774 1775 1776 1777 |
/* * Clear the old entry under pagetable lock and establish the new PTE. * Any parallel GUP will either observe the old page blocking on the * page lock, block on the page table lock or observe the new page. * The SetPageUptodate on the new page and page_add_new_anon_rmap * guarantee the copy is visible before the pagetable update. */ |
f714f4f20 mm: numa: call MM... |
1778 1779 1780 1781 1782 |
flush_cache_range(vma, mmun_start, mmun_end); page_add_new_anon_rmap(new_page, vma, mmun_start); pmdp_clear_flush(vma, mmun_start, pmd); set_pmd_at(mm, mmun_start, pmd, entry); flush_tlb_range(vma, mmun_start, mmun_end); |
ce4a9cc57 mm,numa: fix upda... |
1783 |
update_mmu_cache_pmd(vma, address, &entry); |
2b4847e73 mm: numa: seriali... |
1784 1785 |
if (page_count(page) != 2) { |
f714f4f20 mm: numa: call MM... |
1786 1787 |
set_pmd_at(mm, mmun_start, pmd, orig_entry); flush_tlb_range(vma, mmun_start, mmun_end); |
2b4847e73 mm: numa: seriali... |
1788 1789 1790 1791 |
update_mmu_cache_pmd(vma, address, &entry); page_remove_rmap(new_page); goto fail_putback; } |
b32967ff1 mm: numa: Add THP... |
1792 |
page_remove_rmap(page); |
2b4847e73 mm: numa: seriali... |
1793 |
|
b32967ff1 mm: numa: Add THP... |
1794 1795 1796 1797 1798 1799 |
/* * Finish the charge transaction under the page table lock to * prevent split_huge_page() from dividing up the charge * before it's fully transferred to the new page. */ mem_cgroup_end_migration(memcg, page, new_page, true); |
c4088ebdc mm: convert the r... |
1800 |
spin_unlock(ptl); |
f714f4f20 mm: numa: call MM... |
1801 |
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
b32967ff1 mm: numa: Add THP... |
1802 1803 1804 1805 1806 1807 1808 1809 |
unlock_page(new_page); unlock_page(page); put_page(page); /* Drop the rmap reference */ put_page(page); /* Drop the LRU isolation reference */ count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR); count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR); |
b32967ff1 mm: numa: Add THP... |
1810 1811 1812 1813 |
mod_zone_page_state(page_zone(page), NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR); return isolated; |
340ef3902 mm: numa: cleanup... |
1814 1815 |
out_fail: count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR); |
b32967ff1 mm: numa: Add THP... |
1816 |
out_dropref: |
2b4847e73 mm: numa: seriali... |
1817 1818 1819 |
ptl = pmd_lock(mm, pmd); if (pmd_same(*pmd, entry)) { entry = pmd_mknonnuma(entry); |
f714f4f20 mm: numa: call MM... |
1820 |
set_pmd_at(mm, mmun_start, pmd, entry); |
2b4847e73 mm: numa: seriali... |
1821 1822 1823 |
update_mmu_cache_pmd(vma, address, &entry); } spin_unlock(ptl); |
a54a407fb mm: Close races b... |
1824 |
|
eb4489f69 mm: numa: avoid u... |
1825 |
out_unlock: |
340ef3902 mm: numa: cleanup... |
1826 |
unlock_page(page); |
b32967ff1 mm: numa: Add THP... |
1827 |
put_page(page); |
b32967ff1 mm: numa: Add THP... |
1828 1829 |
return 0; } |
7039e1dbe mm: migrate: Intr... |
1830 1831 1832 |
#endif /* CONFIG_NUMA_BALANCING */ #endif /* CONFIG_NUMA */ |