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mm/migrate.c
77 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Memory Migration functionality - linux/mm/migrate.c |
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* * 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/backing-dev.h> |
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#include <linux/compaction.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/pfn_t.h> |
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#include <linux/memremap.h> |
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#include <linux/userfaultfd_k.h> |
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#include <linux/balloon_compaction.h> |
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#include <linux/mmu_notifier.h> |
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#include <linux/page_idle.h> |
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#include <linux/page_owner.h> |
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#include <linux/sched/mm.h> |
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#include <linux/ptrace.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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int isolate_movable_page(struct page *page, isolate_mode_t mode) |
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{ struct address_space *mapping; /* * Avoid burning cycles with pages that are yet under __free_pages(), * or just got freed under us. * * In case we 'win' a race for a movable page being freed under us and * raise its refcount preventing __free_pages() from doing its job * the put_page() at the end of this block will take care of * release this page, thus avoiding a nasty leakage. */ if (unlikely(!get_page_unless_zero(page))) goto out; /* * Check PageMovable before holding a PG_lock because page's owner * assumes anybody doesn't touch PG_lock of newly allocated page * so unconditionally grapping the lock ruins page's owner side. */ if (unlikely(!__PageMovable(page))) goto out_putpage; /* * As movable pages are not isolated from LRU lists, concurrent * compaction threads can race against page migration functions * as well as race against the releasing a page. * * In order to avoid having an already isolated movable page * being (wrongly) re-isolated while it is under migration, * or to avoid attempting to isolate pages being released, * lets be sure we have the page lock * before proceeding with the movable page isolation steps. */ 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; /* Driver shouldn't use PG_isolated bit of page->flags */ WARN_ON_ONCE(PageIsolated(page)); __SetPageIsolated(page); unlock_page(page); |
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return 0; |
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out_no_isolated: unlock_page(page); out_putpage: put_page(page); out: |
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return -EBUSY; |
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} /* It should be called on page which is PG_movable */ 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); } |
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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); |
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/* * We isolated non-lru movable page so here we can use * __PageMovable because LRU page's mapping cannot have * PAGE_MAPPING_MOVABLE. */ |
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if (unlikely(__PageMovable(page))) { |
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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 { |
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mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_is_file_cache(page), -hpage_nr_pages(page)); |
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putback_lru_page(page); |
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} |
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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 bool remove_migration_pte(struct page *page, struct vm_area_struct *vma, |
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unsigned long addr, void *old) |
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{ |
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struct page_vma_mapped_walk pvmw = { .page = old, .vma = vma, .address = addr, .flags = PVMW_SYNC | PVMW_MIGRATION, }; struct page *new; pte_t pte; |
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swp_entry_t entry; |
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|
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VM_BUG_ON_PAGE(PageTail(page), page); while (page_vma_mapped_walk(&pvmw)) { |
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if (PageKsm(page)) new = page; else new = page - pvmw.page->index + linear_page_index(vma, pvmw.address); |
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|
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#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION /* PMD-mapped THP migration entry */ if (!pvmw.pte) { VM_BUG_ON_PAGE(PageHuge(page) || !PageTransCompound(page), page); remove_migration_pmd(&pvmw, new); continue; } #endif |
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get_page(new); pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot))); if (pte_swp_soft_dirty(*pvmw.pte)) pte = pte_mksoft_dirty(pte); |
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|
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/* * Recheck VMA as permissions can change since migration started */ entry = pte_to_swp_entry(*pvmw.pte); if (is_write_migration_entry(entry)) pte = maybe_mkwrite(pte, vma); |
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|
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if (unlikely(is_zone_device_page(new))) { if (is_device_private_page(new)) { entry = make_device_private_entry(new, pte_write(pte)); pte = swp_entry_to_pte(entry); } else if (is_device_public_page(new)) { pte = pte_mkdevmap(pte); flush_dcache_page(new); } |
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} else flush_dcache_page(new); |
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#ifdef CONFIG_HUGETLB_PAGE |
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if (PageHuge(new)) { pte = pte_mkhuge(pte); pte = arch_make_huge_pte(pte, vma, new, 0); |
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set_huge_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte); |
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if (PageAnon(new)) hugepage_add_anon_rmap(new, vma, pvmw.address); else page_dup_rmap(new, true); |
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} else #endif { set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte); |
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|
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if (PageAnon(new)) page_add_anon_rmap(new, vma, pvmw.address, false); else page_add_file_rmap(new, false); } |
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if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new)) mlock_vma_page(new); |
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if (PageTransHuge(page) && PageMlocked(page)) clear_page_mlock(page); |
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/* No need to invalidate - it was non-present before */ update_mmu_cache(vma, pvmw.address, pvmw.pte); } |
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|
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return true; |
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} /* |
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* Get rid of all migration entries and replace them by * references to the indicated page. */ |
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void remove_migration_ptes(struct page *old, struct page *new, bool locked) |
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{ |
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struct rmap_walk_control rwc = { .rmap_one = remove_migration_pte, .arg = old, }; |
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if (locked) rmap_walk_locked(new, &rwc); else 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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void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep, |
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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_ARCH_ENABLE_THP_MIGRATION void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd) { spinlock_t *ptl; struct page *page; ptl = pmd_lock(mm, pmd); if (!is_pmd_migration_entry(*pmd)) goto unlock; page = migration_entry_to_page(pmd_to_swp_entry(*pmd)); if (!get_page_unless_zero(page)) goto unlock; spin_unlock(ptl); wait_on_page_locked(page); put_page(page); return; unlock: spin_unlock(ptl); } #endif |
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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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struct zone *oldzone, *newzone; int dirty; |
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int expected_count = 1 + extra_count; |
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void **pslot; |
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|
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/* |
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* Device public or private pages have an extra refcount as they are * ZONE_DEVICE pages. |
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*/ |
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expected_count += is_device_private_page(page); expected_count += is_device_public_page(page); |
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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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/* No turning back from here */ |
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newpage->index = page->index; newpage->mapping = page->mapping; if (PageSwapBacked(page)) |
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__SetPageSwapBacked(newpage); |
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|
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return MIGRATEPAGE_SUCCESS; |
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} |
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oldzone = page_zone(page); newzone = page_zone(newpage); |
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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_ref_freeze(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_ref_unfreeze(page, expected_count); |
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spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } /* |
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* Now we know that no one else is looking at the page: * no turning back from here. |
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482 |
*/ |
cf4b769ab mm: page migratio... |
483 484 |
newpage->index = page->index; newpage->mapping = page->mapping; |
7cf9c2c76 [PATCH] radix-tre... |
485 |
get_page(newpage); /* add cache reference */ |
6326fec11 mm: Use owner_pri... |
486 487 488 489 490 491 492 493 |
if (PageSwapBacked(page)) { __SetPageSwapBacked(newpage); if (PageSwapCache(page)) { SetPageSwapCache(newpage); set_page_private(newpage, page_private(page)); } } else { VM_BUG_ON_PAGE(PageSwapCache(page), page); |
b20a35035 [PATCH] page migr... |
494 |
} |
42cb14b11 mm: migrate dirty... |
495 496 497 498 499 500 |
/* Move dirty while page refs frozen and newpage not yet exposed */ dirty = PageDirty(page); if (dirty) { ClearPageDirty(page); SetPageDirty(newpage); } |
6d75f366b lib: radix-tree: ... |
501 |
radix_tree_replace_slot(&mapping->page_tree, pslot, newpage); |
7cf9c2c76 [PATCH] radix-tre... |
502 503 |
/* |
937a94c9d mm: migrate: one ... |
504 505 |
* Drop cache reference from old page by unfreezing * to one less reference. |
7cf9c2c76 [PATCH] radix-tre... |
506 507 |
* We know this isn't the last reference. */ |
fe896d187 mm: introduce pag... |
508 |
page_ref_unfreeze(page, expected_count - 1); |
7cf9c2c76 [PATCH] radix-tre... |
509 |
|
42cb14b11 mm: migrate dirty... |
510 511 |
spin_unlock(&mapping->tree_lock); /* Leave irq disabled to prevent preemption while updating stats */ |
0e8c7d0fd page migration: f... |
512 513 514 515 516 517 518 |
/* * 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 |
4b9d0fab7 mm: rename NR_ANO... |
519 |
* via NR_FILE_PAGES and NR_ANON_MAPPED if they |
0e8c7d0fd page migration: f... |
520 521 |
* are mapped to swap space. */ |
42cb14b11 mm: migrate dirty... |
522 |
if (newzone != oldzone) { |
11fb99898 mm: move most fil... |
523 524 |
__dec_node_state(oldzone->zone_pgdat, NR_FILE_PAGES); __inc_node_state(newzone->zone_pgdat, NR_FILE_PAGES); |
42cb14b11 mm: migrate dirty... |
525 |
if (PageSwapBacked(page) && !PageSwapCache(page)) { |
11fb99898 mm: move most fil... |
526 527 |
__dec_node_state(oldzone->zone_pgdat, NR_SHMEM); __inc_node_state(newzone->zone_pgdat, NR_SHMEM); |
42cb14b11 mm: migrate dirty... |
528 529 |
} if (dirty && mapping_cap_account_dirty(mapping)) { |
11fb99898 mm: move most fil... |
530 |
__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY); |
5a1c84b40 mm: remove reclai... |
531 |
__dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING); |
11fb99898 mm: move most fil... |
532 |
__inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY); |
5a1c84b40 mm: remove reclai... |
533 |
__inc_zone_state(newzone, NR_ZONE_WRITE_PENDING); |
42cb14b11 mm: migrate dirty... |
534 |
} |
4b02108ac mm: oom analysis:... |
535 |
} |
42cb14b11 mm: migrate dirty... |
536 |
local_irq_enable(); |
b20a35035 [PATCH] page migr... |
537 |
|
78bd52097 mm: adjust addres... |
538 |
return MIGRATEPAGE_SUCCESS; |
b20a35035 [PATCH] page migr... |
539 |
} |
1118dce77 mm: Export migrat... |
540 |
EXPORT_SYMBOL(migrate_page_move_mapping); |
b20a35035 [PATCH] page migr... |
541 542 |
/* |
290408d4a hugetlb: hugepage... |
543 544 545 546 547 548 549 550 |
* 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; |
290408d4a hugetlb: hugepage... |
551 552 553 554 555 556 557 |
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 || |
29c1f677d mm: migration: us... |
558 |
radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) { |
290408d4a hugetlb: hugepage... |
559 560 561 |
spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } |
fe896d187 mm: introduce pag... |
562 |
if (!page_ref_freeze(page, expected_count)) { |
290408d4a hugetlb: hugepage... |
563 564 565 |
spin_unlock_irq(&mapping->tree_lock); return -EAGAIN; } |
cf4b769ab mm: page migratio... |
566 567 |
newpage->index = page->index; newpage->mapping = page->mapping; |
6a93ca8fd mm: migrate: do n... |
568 |
|
290408d4a hugetlb: hugepage... |
569 |
get_page(newpage); |
6d75f366b lib: radix-tree: ... |
570 |
radix_tree_replace_slot(&mapping->page_tree, pslot, newpage); |
290408d4a hugetlb: hugepage... |
571 |
|
fe896d187 mm: introduce pag... |
572 |
page_ref_unfreeze(page, expected_count - 1); |
290408d4a hugetlb: hugepage... |
573 574 |
spin_unlock_irq(&mapping->tree_lock); |
6a93ca8fd mm: migrate: do n... |
575 |
|
78bd52097 mm: adjust addres... |
576 |
return MIGRATEPAGE_SUCCESS; |
290408d4a hugetlb: hugepage... |
577 578 579 |
} /* |
30b0a105d mm: thp: give tra... |
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 |
* 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... |
628 629 |
* Copy the page to its new location */ |
2916ecc0f mm/migrate: new m... |
630 |
void migrate_page_states(struct page *newpage, struct page *page) |
b20a35035 [PATCH] page migr... |
631 |
{ |
7851a45cd mm: numa: Copy cp... |
632 |
int cpupid; |
b20a35035 [PATCH] page migr... |
633 634 635 636 637 638 |
if (PageError(page)) SetPageError(newpage); if (PageReferenced(page)) SetPageReferenced(newpage); if (PageUptodate(page)) SetPageUptodate(newpage); |
894bc3104 Unevictable LRU I... |
639 |
if (TestClearPageActive(page)) { |
309381fea mm: dump page whe... |
640 |
VM_BUG_ON_PAGE(PageUnevictable(page), page); |
b20a35035 [PATCH] page migr... |
641 |
SetPageActive(newpage); |
418b27ef5 mm: remove unevic... |
642 643 |
} else if (TestClearPageUnevictable(page)) SetPageUnevictable(newpage); |
b20a35035 [PATCH] page migr... |
644 645 646 647 |
if (PageChecked(page)) SetPageChecked(newpage); if (PageMappedToDisk(page)) SetPageMappedToDisk(newpage); |
42cb14b11 mm: migrate dirty... |
648 649 650 |
/* Move dirty on pages not done by migrate_page_move_mapping() */ if (PageDirty(page)) SetPageDirty(newpage); |
b20a35035 [PATCH] page migr... |
651 |
|
33c3fc71c mm: introduce idl... |
652 653 654 655 |
if (page_is_young(page)) set_page_young(newpage); if (page_is_idle(page)) set_page_idle(newpage); |
7851a45cd mm: numa: Copy cp... |
656 657 658 659 660 661 |
/* * 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); |
e9995ef97 ksm: rmap_walk to... |
662 |
ksm_migrate_page(newpage, page); |
c8d6553b9 ksm: make KSM pag... |
663 664 665 666 |
/* * Please do not reorder this without considering how mm/ksm.c's * get_ksm_page() depends upon ksm_migrate_page() and PageSwapCache(). */ |
b3b3a99c5 mm/migrate: check... |
667 668 |
if (PageSwapCache(page)) ClearPageSwapCache(page); |
b20a35035 [PATCH] page migr... |
669 670 |
ClearPagePrivate(page); set_page_private(page, 0); |
b20a35035 [PATCH] page migr... |
671 672 673 674 675 676 677 |
/* * If any waiters have accumulated on the new page then * wake them up. */ if (PageWriteback(newpage)) end_page_writeback(newpage); |
d435edca9 mm, page_owner: c... |
678 679 |
copy_page_owner(page, newpage); |
74485cf2b mm: migrate: cons... |
680 681 |
mem_cgroup_migrate(page, newpage); |
b20a35035 [PATCH] page migr... |
682 |
} |
2916ecc0f mm/migrate: new m... |
683 684 685 686 687 688 689 690 691 692 693 |
EXPORT_SYMBOL(migrate_page_states); void migrate_page_copy(struct page *newpage, struct page *page) { if (PageHuge(page) || PageTransHuge(page)) copy_huge_page(newpage, page); else copy_highpage(newpage, page); migrate_page_states(newpage, page); } |
1118dce77 mm: Export migrat... |
694 |
EXPORT_SYMBOL(migrate_page_copy); |
b20a35035 [PATCH] page migr... |
695 |
|
1d8b85ccf [PATCH] page migr... |
696 697 698 |
/************************************************************ * Migration functions ***********************************************************/ |
b20a35035 [PATCH] page migr... |
699 |
/* |
bda807d44 mm: migrate: supp... |
700 |
* Common logic to directly migrate a single LRU page suitable for |
266cf658e FS-Cache: Recruit... |
701 |
* pages that do not use PagePrivate/PagePrivate2. |
b20a35035 [PATCH] page migr... |
702 703 704 |
* * Pages are locked upon entry and exit. */ |
2d1db3b11 [PATCH] page migr... |
705 |
int migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
706 707 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
b20a35035 [PATCH] page migr... |
708 709 710 711 |
{ int rc; BUG_ON(PageWriteback(page)); /* Writeback must be complete */ |
8e321fefb aio/migratepages:... |
712 |
rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0); |
b20a35035 [PATCH] page migr... |
713 |
|
78bd52097 mm: adjust addres... |
714 |
if (rc != MIGRATEPAGE_SUCCESS) |
b20a35035 [PATCH] page migr... |
715 |
return rc; |
2916ecc0f mm/migrate: new m... |
716 717 718 719 |
if (mode != MIGRATE_SYNC_NO_COPY) migrate_page_copy(newpage, page); else migrate_page_states(newpage, page); |
78bd52097 mm: adjust addres... |
720 |
return MIGRATEPAGE_SUCCESS; |
b20a35035 [PATCH] page migr... |
721 722 |
} EXPORT_SYMBOL(migrate_page); |
9361401eb [PATCH] BLOCK: Ma... |
723 |
#ifdef CONFIG_BLOCK |
b20a35035 [PATCH] page migr... |
724 |
/* |
1d8b85ccf [PATCH] page migr... |
725 726 727 728 |
* 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... |
729 |
int buffer_migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
730 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
1d8b85ccf [PATCH] page migr... |
731 |
{ |
1d8b85ccf [PATCH] page migr... |
732 733 |
struct buffer_head *bh, *head; int rc; |
1d8b85ccf [PATCH] page migr... |
734 |
if (!page_has_buffers(page)) |
a6bc32b89 mm: compaction: i... |
735 |
return migrate_page(mapping, newpage, page, mode); |
1d8b85ccf [PATCH] page migr... |
736 737 |
head = page_buffers(page); |
8e321fefb aio/migratepages:... |
738 |
rc = migrate_page_move_mapping(mapping, newpage, page, head, mode, 0); |
1d8b85ccf [PATCH] page migr... |
739 |
|
78bd52097 mm: adjust addres... |
740 |
if (rc != MIGRATEPAGE_SUCCESS) |
1d8b85ccf [PATCH] page migr... |
741 |
return rc; |
b969c4ab9 mm: compaction: d... |
742 743 744 745 746 |
/* * 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... |
747 748 |
if (mode != MIGRATE_ASYNC) BUG_ON(!buffer_migrate_lock_buffers(head, mode)); |
1d8b85ccf [PATCH] page migr... |
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
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); |
2916ecc0f mm/migrate: new m... |
764 765 766 767 |
if (mode != MIGRATE_SYNC_NO_COPY) migrate_page_copy(newpage, page); else migrate_page_states(newpage, page); |
1d8b85ccf [PATCH] page migr... |
768 769 770 771 |
bh = head; do { unlock_buffer(bh); |
2916ecc0f mm/migrate: new m... |
772 |
put_bh(bh); |
1d8b85ccf [PATCH] page migr... |
773 774 775 |
bh = bh->b_this_page; } while (bh != head); |
78bd52097 mm: adjust addres... |
776 |
return MIGRATEPAGE_SUCCESS; |
1d8b85ccf [PATCH] page migr... |
777 778 |
} EXPORT_SYMBOL(buffer_migrate_page); |
9361401eb [PATCH] BLOCK: Ma... |
779 |
#endif |
1d8b85ccf [PATCH] page migr... |
780 |
|
04e62a29b [PATCH] More page... |
781 782 783 784 |
/* * Writeback a page to clean the dirty state */ static int writeout(struct address_space *mapping, struct page *page) |
8351a6e47 [PATCH] page migr... |
785 |
{ |
04e62a29b [PATCH] More page... |
786 787 788 789 790 |
struct writeback_control wbc = { .sync_mode = WB_SYNC_NONE, .nr_to_write = 1, .range_start = 0, .range_end = LLONG_MAX, |
04e62a29b [PATCH] More page... |
791 792 793 794 795 796 797 798 799 800 801 |
.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... |
802 |
/* |
04e62a29b [PATCH] More page... |
803 804 805 806 807 808 |
* 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... |
809 |
*/ |
e388466de mm: make remove_m... |
810 |
remove_migration_ptes(page, page, false); |
8351a6e47 [PATCH] page migr... |
811 |
|
04e62a29b [PATCH] More page... |
812 |
rc = mapping->a_ops->writepage(page, &wbc); |
8351a6e47 [PATCH] page migr... |
813 |
|
04e62a29b [PATCH] More page... |
814 815 816 |
if (rc != AOP_WRITEPAGE_ACTIVATE) /* unlocked. Relock */ lock_page(page); |
bda8550de migration: fix wr... |
817 |
return (rc < 0) ? -EIO : -EAGAIN; |
04e62a29b [PATCH] More page... |
818 819 820 821 822 823 |
} /* * Default handling if a filesystem does not provide a migration function. */ static int fallback_migrate_page(struct address_space *mapping, |
a6bc32b89 mm: compaction: i... |
824 |
struct page *newpage, struct page *page, enum migrate_mode mode) |
04e62a29b [PATCH] More page... |
825 |
{ |
b969c4ab9 mm: compaction: d... |
826 |
if (PageDirty(page)) { |
a6bc32b89 mm: compaction: i... |
827 |
/* Only writeback pages in full synchronous migration */ |
2916ecc0f mm/migrate: new m... |
828 829 830 831 832 |
switch (mode) { case MIGRATE_SYNC: case MIGRATE_SYNC_NO_COPY: break; default: |
b969c4ab9 mm: compaction: d... |
833 |
return -EBUSY; |
2916ecc0f mm/migrate: new m... |
834 |
} |
04e62a29b [PATCH] More page... |
835 |
return writeout(mapping, page); |
b969c4ab9 mm: compaction: d... |
836 |
} |
8351a6e47 [PATCH] page migr... |
837 838 839 840 841 |
/* * Buffers may be managed in a filesystem specific way. * We must have no buffers or drop them. */ |
266cf658e FS-Cache: Recruit... |
842 |
if (page_has_private(page) && |
8351a6e47 [PATCH] page migr... |
843 844 |
!try_to_release_page(page, GFP_KERNEL)) return -EAGAIN; |
a6bc32b89 mm: compaction: i... |
845 |
return migrate_page(mapping, newpage, page, mode); |
8351a6e47 [PATCH] page migr... |
846 |
} |
1d8b85ccf [PATCH] page migr... |
847 |
/* |
e24f0b8f7 [PATCH] page migr... |
848 849 850 851 852 |
* 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... |
853 854 855 |
* * Return value: * < 0 - error code |
78bd52097 mm: adjust addres... |
856 |
* MIGRATEPAGE_SUCCESS - success |
e24f0b8f7 [PATCH] page migr... |
857 |
*/ |
3fe2011ff mm: migration: al... |
858 |
static int move_to_new_page(struct page *newpage, struct page *page, |
5c3f9a673 mm: page migratio... |
859 |
enum migrate_mode mode) |
e24f0b8f7 [PATCH] page migr... |
860 861 |
{ struct address_space *mapping; |
bda807d44 mm: migrate: supp... |
862 863 |
int rc = -EAGAIN; bool is_lru = !__PageMovable(page); |
e24f0b8f7 [PATCH] page migr... |
864 |
|
7db7671f8 mm: page migratio... |
865 866 |
VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); |
e24f0b8f7 [PATCH] page migr... |
867 |
|
e24f0b8f7 [PATCH] page migr... |
868 |
mapping = page_mapping(page); |
bda807d44 mm: migrate: supp... |
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 |
if (likely(is_lru)) { if (!mapping) rc = migrate_page(mapping, newpage, page, mode); else if (mapping->a_ops->migratepage) /* * 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. */ rc = mapping->a_ops->migratepage(mapping, newpage, page, mode); else rc = fallback_migrate_page(mapping, newpage, page, mode); } else { |
e24f0b8f7 [PATCH] page migr... |
887 |
/* |
bda807d44 mm: migrate: supp... |
888 889 |
* In case of non-lru page, it could be released after * isolation step. In that case, we shouldn't try migration. |
e24f0b8f7 [PATCH] page migr... |
890 |
*/ |
bda807d44 mm: migrate: supp... |
891 892 893 894 895 896 897 898 899 900 901 902 |
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)); } |
e24f0b8f7 [PATCH] page migr... |
903 |
|
5c3f9a673 mm: page migratio... |
904 905 906 907 908 |
/* * When successful, old pagecache page->mapping must be cleared before * page is freed; but stats require that PageAnon be left as PageAnon. */ if (rc == MIGRATEPAGE_SUCCESS) { |
bda807d44 mm: migrate: supp... |
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 |
if (__PageMovable(page)) { VM_BUG_ON_PAGE(!PageIsolated(page), page); /* * We clear PG_movable under page_lock so any compactor * cannot try to migrate this page. */ __ClearPageIsolated(page); } /* * Anonymous and movable page->mapping will be cleard by * free_pages_prepare so don't reset it here for keeping * the type to work PageAnon, for example. */ if (!PageMappingFlags(page)) |
5c3f9a673 mm: page migratio... |
925 |
page->mapping = NULL; |
3fe2011ff mm: migration: al... |
926 |
} |
bda807d44 mm: migrate: supp... |
927 |
out: |
e24f0b8f7 [PATCH] page migr... |
928 929 |
return rc; } |
0dabec93d mm: migration: cl... |
930 |
static int __unmap_and_move(struct page *page, struct page *newpage, |
9c620e2bc mm: remove offlin... |
931 |
int force, enum migrate_mode mode) |
e24f0b8f7 [PATCH] page migr... |
932 |
{ |
0dabec93d mm: migration: cl... |
933 |
int rc = -EAGAIN; |
2ebba6b7e mm: unmapped page... |
934 |
int page_was_mapped = 0; |
3f6c82728 mm: migration: ta... |
935 |
struct anon_vma *anon_vma = NULL; |
bda807d44 mm: migrate: supp... |
936 |
bool is_lru = !__PageMovable(page); |
95a402c38 [PATCH] page migr... |
937 |
|
529ae9aaa mm: rename page t... |
938 |
if (!trylock_page(page)) { |
a6bc32b89 mm: compaction: i... |
939 |
if (!force || mode == MIGRATE_ASYNC) |
0dabec93d mm: migration: cl... |
940 |
goto out; |
3e7d34497 mm: vmscan: recla... |
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 |
/* * 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... |
956 |
goto out; |
3e7d34497 mm: vmscan: recla... |
957 |
|
e24f0b8f7 [PATCH] page migr... |
958 959 960 961 |
lock_page(page); } if (PageWriteback(page)) { |
11bc82d67 mm: compaction: U... |
962 |
/* |
fed5b64a9 mm/migrate: fix c... |
963 |
* Only in the case of a full synchronous migration is it |
a6bc32b89 mm: compaction: i... |
964 965 966 |
* 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... |
967 |
*/ |
2916ecc0f mm/migrate: new m... |
968 969 970 971 972 |
switch (mode) { case MIGRATE_SYNC: case MIGRATE_SYNC_NO_COPY: break; default: |
11bc82d67 mm: compaction: U... |
973 |
rc = -EBUSY; |
0a31bc97c mm: memcontrol: r... |
974 |
goto out_unlock; |
11bc82d67 mm: compaction: U... |
975 976 |
} if (!force) |
0a31bc97c mm: memcontrol: r... |
977 |
goto out_unlock; |
e24f0b8f7 [PATCH] page migr... |
978 979 |
wait_on_page_writeback(page); } |
03f15c86c mm: simplify page... |
980 |
|
e24f0b8f7 [PATCH] page migr... |
981 |
/* |
dc386d4d1 memory unplug: mi... |
982 983 |
* 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... |
984 |
* This get_anon_vma() delays freeing anon_vma pointer until the end |
dc386d4d1 memory unplug: mi... |
985 |
* of migration. File cache pages are no problem because of page_lock() |
989f89c57 fix rcu_read_lock... |
986 987 |
* File Caches may use write_page() or lock_page() in migration, then, * just care Anon page here. |
03f15c86c mm: simplify page... |
988 989 990 991 992 993 |
* * Only page_get_anon_vma() understands the subtleties of * getting a hold on an anon_vma from outside one of its mms. * But if we cannot get anon_vma, then we won't need it anyway, * because that implies that the anon page is no longer mapped * (and cannot be remapped so long as we hold the page lock). |
dc386d4d1 memory unplug: mi... |
994 |
*/ |
03f15c86c mm: simplify page... |
995 |
if (PageAnon(page) && !PageKsm(page)) |
746b18d42 mm: use refcounts... |
996 |
anon_vma = page_get_anon_vma(page); |
62e1c5530 page migraton: ha... |
997 |
|
7db7671f8 mm: page migratio... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 |
/* * Block others from accessing the new page when we get around to * establishing additional references. We are usually the only one * holding a reference to newpage at this point. We used to have a BUG * here if trylock_page(newpage) fails, but would like to allow for * cases where there might be a race with the previous use of newpage. * This is much like races on refcount of oldpage: just don't BUG(). */ if (unlikely(!trylock_page(newpage))) goto out_unlock; |
bda807d44 mm: migrate: supp... |
1008 1009 1010 1011 |
if (unlikely(!is_lru)) { rc = move_to_new_page(newpage, page, mode); goto out_unlock_both; } |
dc386d4d1 memory unplug: mi... |
1012 |
/* |
62e1c5530 page migraton: ha... |
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 |
* 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... |
1023 |
*/ |
62e1c5530 page migraton: ha... |
1024 |
if (!page->mapping) { |
309381fea mm: dump page whe... |
1025 |
VM_BUG_ON_PAGE(PageAnon(page), page); |
1ce82b69e mm: fix migration... |
1026 |
if (page_has_private(page)) { |
62e1c5530 page migraton: ha... |
1027 |
try_to_free_buffers(page); |
7db7671f8 mm: page migratio... |
1028 |
goto out_unlock_both; |
62e1c5530 page migraton: ha... |
1029 |
} |
7db7671f8 mm: page migratio... |
1030 1031 |
} else if (page_mapped(page)) { /* Establish migration ptes */ |
03f15c86c mm: simplify page... |
1032 1033 |
VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma, page); |
2ebba6b7e mm: unmapped page... |
1034 |
try_to_unmap(page, |
da1b13ccf mm/hwpoison: fix ... |
1035 |
TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); |
2ebba6b7e mm: unmapped page... |
1036 1037 |
page_was_mapped = 1; } |
dc386d4d1 memory unplug: mi... |
1038 |
|
e6a1530d6 [PATCH] Allow mig... |
1039 |
if (!page_mapped(page)) |
5c3f9a673 mm: page migratio... |
1040 |
rc = move_to_new_page(newpage, page, mode); |
e24f0b8f7 [PATCH] page migr... |
1041 |
|
5c3f9a673 mm: page migratio... |
1042 1043 |
if (page_was_mapped) remove_migration_ptes(page, |
e388466de mm: make remove_m... |
1044 |
rc == MIGRATEPAGE_SUCCESS ? newpage : page, false); |
3f6c82728 mm: migration: ta... |
1045 |
|
7db7671f8 mm: page migratio... |
1046 1047 1048 |
out_unlock_both: unlock_page(newpage); out_unlock: |
3f6c82728 mm: migration: ta... |
1049 |
/* Drop an anon_vma reference if we took one */ |
76545066c mm: extend KSM re... |
1050 |
if (anon_vma) |
9e60109f1 mm: rename drop_a... |
1051 |
put_anon_vma(anon_vma); |
e24f0b8f7 [PATCH] page migr... |
1052 |
unlock_page(page); |
0dabec93d mm: migration: cl... |
1053 |
out: |
c6c919eb9 mm: use put_page(... |
1054 1055 1056 1057 |
/* * If migration is successful, decrease refcount of the newpage * which will not free the page because new page owner increased * refcounter. As well, if it is LRU page, add the page to LRU |
4ebbe06b6 mm: migrate: don'... |
1058 1059 1060 1061 |
* list in here. Use the old state of the isolated source page to * determine if we migrated a LRU page. newpage was already unlocked * and possibly modified by its owner - don't rely on the page * state. |
c6c919eb9 mm: use put_page(... |
1062 1063 |
*/ if (rc == MIGRATEPAGE_SUCCESS) { |
4ebbe06b6 mm: migrate: don'... |
1064 |
if (unlikely(!is_lru)) |
c6c919eb9 mm: use put_page(... |
1065 1066 1067 1068 |
put_page(newpage); else putback_lru_page(newpage); } |
0dabec93d mm: migration: cl... |
1069 1070 |
return rc; } |
95a402c38 [PATCH] page migr... |
1071 |
|
0dabec93d mm: migration: cl... |
1072 |
/* |
ef2a5153b mm/migrate: mark ... |
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 |
* gcc 4.7 and 4.8 on arm get an ICEs when inlining unmap_and_move(). Work * around it. */ #if (GCC_VERSION >= 40700 && GCC_VERSION < 40900) && defined(CONFIG_ARM) #define ICE_noinline noinline #else #define ICE_noinline #endif /* |
0dabec93d mm: migration: cl... |
1083 1084 1085 |
* Obtain the lock on page, remove all ptes and migrate the page * to the newly allocated page in newpage. */ |
ef2a5153b mm/migrate: mark ... |
1086 1087 1088 |
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, |
add05cece mm: soft-offline:... |
1089 1090 |
int force, enum migrate_mode mode, enum migrate_reason reason) |
0dabec93d mm: migration: cl... |
1091 |
{ |
2def7424c mm: page migratio... |
1092 |
int rc = MIGRATEPAGE_SUCCESS; |
0dabec93d mm: migration: cl... |
1093 |
int *result = NULL; |
2def7424c mm: page migratio... |
1094 |
struct page *newpage; |
0dabec93d mm: migration: cl... |
1095 |
|
2def7424c mm: page migratio... |
1096 |
newpage = get_new_page(page, private, &result); |
0dabec93d mm: migration: cl... |
1097 1098 1099 1100 1101 |
if (!newpage) return -ENOMEM; if (page_count(page) == 1) { /* page was freed from under us. So we are done. */ |
c6c919eb9 mm: use put_page(... |
1102 1103 |
ClearPageActive(page); ClearPageUnevictable(page); |
bda807d44 mm: migrate: supp... |
1104 1105 1106 1107 1108 1109 |
if (unlikely(__PageMovable(page))) { lock_page(page); if (!PageMovable(page)) __ClearPageIsolated(page); unlock_page(page); } |
c6c919eb9 mm: use put_page(... |
1110 1111 1112 1113 |
if (put_new_page) put_new_page(newpage, private); else put_page(newpage); |
0dabec93d mm: migration: cl... |
1114 1115 |
goto out; } |
616b83715 mm: thp: enable t... |
1116 |
if (unlikely(PageTransHuge(page) && !PageTransHuge(newpage))) { |
4d2fa9654 thp, mm: split_hu... |
1117 1118 1119 1120 |
lock_page(page); rc = split_huge_page(page); unlock_page(page); if (rc) |
0dabec93d mm: migration: cl... |
1121 |
goto out; |
4d2fa9654 thp, mm: split_hu... |
1122 |
} |
0dabec93d mm: migration: cl... |
1123 |
|
9c620e2bc mm: remove offlin... |
1124 |
rc = __unmap_and_move(page, newpage, force, mode); |
c6c919eb9 mm: use put_page(... |
1125 |
if (rc == MIGRATEPAGE_SUCCESS) |
7cd12b4ab mm, page_owner: t... |
1126 |
set_page_owner_migrate_reason(newpage, reason); |
bf6bddf19 mm: introduce com... |
1127 |
|
0dabec93d mm: migration: cl... |
1128 |
out: |
e24f0b8f7 [PATCH] page migr... |
1129 |
if (rc != -EAGAIN) { |
0dabec93d mm: migration: cl... |
1130 1131 1132 1133 1134 1135 1136 |
/* * 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); |
6afcf8ef0 mm, compaction: f... |
1137 1138 1139 1140 1141 1142 1143 |
/* * Compaction can migrate also non-LRU pages which are * not accounted to NR_ISOLATED_*. They can be recognized * as __PageMovable */ if (likely(!__PageMovable(page))) |
e8db67eb0 mm: migrate: move... |
1144 1145 |
mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_is_file_cache(page), -hpage_nr_pages(page)); |
c6c919eb9 mm: use put_page(... |
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 |
} /* * If migration is successful, releases reference grabbed during * isolation. Otherwise, restore the page to right list unless * we want to retry. */ if (rc == MIGRATEPAGE_SUCCESS) { put_page(page); if (reason == MR_MEMORY_FAILURE) { |
d7e69488b mm/hwpoison: fix ... |
1156 |
/* |
c6c919eb9 mm: use put_page(... |
1157 1158 1159 |
* Set PG_HWPoison on just freed page * intentionally. Although it's rather weird, * it's how HWPoison flag works at the moment. |
d7e69488b mm/hwpoison: fix ... |
1160 |
*/ |
da1b13ccf mm/hwpoison: fix ... |
1161 1162 |
if (!test_set_page_hwpoison(page)) num_poisoned_pages_inc(); |
c6c919eb9 mm: use put_page(... |
1163 1164 |
} } else { |
bda807d44 mm: migrate: supp... |
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 |
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: |
c6c919eb9 mm: use put_page(... |
1180 1181 1182 1183 |
if (put_new_page) put_new_page(newpage, private); else put_page(newpage); |
e24f0b8f7 [PATCH] page migr... |
1184 |
} |
68711a746 mm, migration: ad... |
1185 |
|
742755a1d [PATCH] page migr... |
1186 1187 1188 1189 1190 1191 |
if (result) { if (rc) *result = rc; else *result = page_to_nid(newpage); } |
e24f0b8f7 [PATCH] page migr... |
1192 1193 1194 1195 |
return rc; } /* |
290408d4a hugetlb: hugepage... |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 |
* 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, |
68711a746 mm, migration: ad... |
1214 1215 |
free_page_t put_new_page, unsigned long private, struct page *hpage, int force, |
7cd12b4ab mm, page_owner: t... |
1216 |
enum migrate_mode mode, int reason) |
290408d4a hugetlb: hugepage... |
1217 |
{ |
2def7424c mm: page migratio... |
1218 |
int rc = -EAGAIN; |
290408d4a hugetlb: hugepage... |
1219 |
int *result = NULL; |
2ebba6b7e mm: unmapped page... |
1220 |
int page_was_mapped = 0; |
32665f2bb mm/migrate: corre... |
1221 |
struct page *new_hpage; |
290408d4a hugetlb: hugepage... |
1222 |
struct anon_vma *anon_vma = NULL; |
83467efbd mm: migrate: chec... |
1223 1224 1225 1226 1227 1228 1229 |
/* * 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. */ |
100873d7a hugetlb: rename h... |
1230 |
if (!hugepage_migration_supported(page_hstate(hpage))) { |
32665f2bb mm/migrate: corre... |
1231 |
putback_active_hugepage(hpage); |
83467efbd mm: migrate: chec... |
1232 |
return -ENOSYS; |
32665f2bb mm/migrate: corre... |
1233 |
} |
83467efbd mm: migrate: chec... |
1234 |
|
32665f2bb mm/migrate: corre... |
1235 |
new_hpage = get_new_page(hpage, private, &result); |
290408d4a hugetlb: hugepage... |
1236 1237 |
if (!new_hpage) return -ENOMEM; |
290408d4a hugetlb: hugepage... |
1238 |
if (!trylock_page(hpage)) { |
2916ecc0f mm/migrate: new m... |
1239 |
if (!force) |
290408d4a hugetlb: hugepage... |
1240 |
goto out; |
2916ecc0f mm/migrate: new m... |
1241 1242 1243 1244 1245 1246 1247 |
switch (mode) { case MIGRATE_SYNC: case MIGRATE_SYNC_NO_COPY: break; default: goto out; } |
290408d4a hugetlb: hugepage... |
1248 1249 |
lock_page(hpage); } |
746b18d42 mm: use refcounts... |
1250 1251 |
if (PageAnon(hpage)) anon_vma = page_get_anon_vma(hpage); |
290408d4a hugetlb: hugepage... |
1252 |
|
7db7671f8 mm: page migratio... |
1253 1254 |
if (unlikely(!trylock_page(new_hpage))) goto put_anon; |
2ebba6b7e mm: unmapped page... |
1255 1256 1257 1258 1259 |
if (page_mapped(hpage)) { try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); page_was_mapped = 1; } |
290408d4a hugetlb: hugepage... |
1260 1261 |
if (!page_mapped(hpage)) |
5c3f9a673 mm: page migratio... |
1262 |
rc = move_to_new_page(new_hpage, hpage, mode); |
290408d4a hugetlb: hugepage... |
1263 |
|
5c3f9a673 mm: page migratio... |
1264 1265 |
if (page_was_mapped) remove_migration_ptes(hpage, |
e388466de mm: make remove_m... |
1266 |
rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage, false); |
290408d4a hugetlb: hugepage... |
1267 |
|
7db7671f8 mm: page migratio... |
1268 1269 1270 |
unlock_page(new_hpage); put_anon: |
fd4a4663d mm: fix hugepage ... |
1271 |
if (anon_vma) |
9e60109f1 mm: rename drop_a... |
1272 |
put_anon_vma(anon_vma); |
8e6ac7fab hugetlb/cgroup: m... |
1273 |
|
2def7424c mm: page migratio... |
1274 |
if (rc == MIGRATEPAGE_SUCCESS) { |
8e6ac7fab hugetlb/cgroup: m... |
1275 |
hugetlb_cgroup_migrate(hpage, new_hpage); |
2def7424c mm: page migratio... |
1276 |
put_new_page = NULL; |
7cd12b4ab mm, page_owner: t... |
1277 |
set_page_owner_migrate_reason(new_hpage, reason); |
2def7424c mm: page migratio... |
1278 |
} |
8e6ac7fab hugetlb/cgroup: m... |
1279 |
|
290408d4a hugetlb: hugepage... |
1280 |
unlock_page(hpage); |
09761333e mm/migrate.c: pai... |
1281 |
out: |
b8ec1cee5 mm: soft-offline:... |
1282 1283 |
if (rc != -EAGAIN) putback_active_hugepage(hpage); |
c3114a84f mm: hugetlb: soft... |
1284 1285 |
if (reason == MR_MEMORY_FAILURE && !test_set_page_hwpoison(hpage)) num_poisoned_pages_inc(); |
68711a746 mm, migration: ad... |
1286 1287 1288 1289 1290 1291 |
/* * If migration was not successful and there's a freeing callback, use * it. Otherwise, put_page() will drop the reference grabbed during * isolation. */ |
2def7424c mm: page migratio... |
1292 |
if (put_new_page) |
68711a746 mm, migration: ad... |
1293 1294 |
put_new_page(new_hpage, private); else |
3aaa76e12 mm: migrate: huge... |
1295 |
putback_active_hugepage(new_hpage); |
68711a746 mm, migration: ad... |
1296 |
|
290408d4a hugetlb: hugepage... |
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 |
if (result) { if (rc) *result = rc; else *result = page_to_nid(new_hpage); } return rc; } /* |
c73e5c9c5 mm: rewrite the c... |
1307 1308 |
* 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... |
1309 |
* |
c73e5c9c5 mm: rewrite the c... |
1310 1311 1312 |
* @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. |
68711a746 mm, migration: ad... |
1313 1314 |
* @put_new_page: The function used to free target pages if migration * fails, or NULL if no special handling is necessary. |
c73e5c9c5 mm: rewrite the c... |
1315 1316 1317 1318 |
* @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... |
1319 |
* |
c73e5c9c5 mm: rewrite the c... |
1320 1321 |
* 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. |
14e0f9bcc mm: correct a cou... |
1322 |
* The caller should call putback_movable_pages() to return pages to the LRU |
28bd65781 mm: migration: cl... |
1323 |
* or free list only if ret != 0. |
b20a35035 [PATCH] page migr... |
1324 |
* |
c73e5c9c5 mm: rewrite the c... |
1325 |
* Returns the number of pages that were not migrated, or an error code. |
b20a35035 [PATCH] page migr... |
1326 |
*/ |
9c620e2bc mm: remove offlin... |
1327 |
int migrate_pages(struct list_head *from, new_page_t get_new_page, |
68711a746 mm, migration: ad... |
1328 1329 |
free_page_t put_new_page, unsigned long private, enum migrate_mode mode, int reason) |
b20a35035 [PATCH] page migr... |
1330 |
{ |
e24f0b8f7 [PATCH] page migr... |
1331 |
int retry = 1; |
b20a35035 [PATCH] page migr... |
1332 |
int nr_failed = 0; |
5647bc293 mm: compaction: M... |
1333 |
int nr_succeeded = 0; |
b20a35035 [PATCH] page migr... |
1334 1335 1336 1337 1338 1339 1340 1341 |
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... |
1342 1343 |
for(pass = 0; pass < 10 && retry; pass++) { retry = 0; |
b20a35035 [PATCH] page migr... |
1344 |
|
e24f0b8f7 [PATCH] page migr... |
1345 |
list_for_each_entry_safe(page, page2, from, lru) { |
e24f0b8f7 [PATCH] page migr... |
1346 |
cond_resched(); |
2d1db3b11 [PATCH] page migr... |
1347 |
|
31caf665e mm: migrate: make... |
1348 1349 |
if (PageHuge(page)) rc = unmap_and_move_huge_page(get_new_page, |
68711a746 mm, migration: ad... |
1350 |
put_new_page, private, page, |
7cd12b4ab mm, page_owner: t... |
1351 |
pass > 2, mode, reason); |
31caf665e mm: migrate: make... |
1352 |
else |
68711a746 mm, migration: ad... |
1353 |
rc = unmap_and_move(get_new_page, put_new_page, |
add05cece mm: soft-offline:... |
1354 1355 |
private, page, pass > 2, mode, reason); |
2d1db3b11 [PATCH] page migr... |
1356 |
|
e24f0b8f7 [PATCH] page migr... |
1357 |
switch(rc) { |
95a402c38 [PATCH] page migr... |
1358 |
case -ENOMEM: |
dfef2ef40 mm, migrate: incr... |
1359 |
nr_failed++; |
95a402c38 [PATCH] page migr... |
1360 |
goto out; |
e24f0b8f7 [PATCH] page migr... |
1361 |
case -EAGAIN: |
2d1db3b11 [PATCH] page migr... |
1362 |
retry++; |
e24f0b8f7 [PATCH] page migr... |
1363 |
break; |
78bd52097 mm: adjust addres... |
1364 |
case MIGRATEPAGE_SUCCESS: |
5647bc293 mm: compaction: M... |
1365 |
nr_succeeded++; |
e24f0b8f7 [PATCH] page migr... |
1366 1367 |
break; default: |
354a33633 mm/migrate: add c... |
1368 1369 1370 1371 1372 1373 |
/* * 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... |
1374 |
nr_failed++; |
e24f0b8f7 [PATCH] page migr... |
1375 |
break; |
2d1db3b11 [PATCH] page migr... |
1376 |
} |
b20a35035 [PATCH] page migr... |
1377 1378 |
} } |
f2f81fb2b mm, migrate: coun... |
1379 1380 |
nr_failed += retry; rc = nr_failed; |
95a402c38 [PATCH] page migr... |
1381 |
out: |
5647bc293 mm: compaction: M... |
1382 1383 1384 1385 |
if (nr_succeeded) count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded); if (nr_failed) count_vm_events(PGMIGRATE_FAIL, nr_failed); |
7b2a2d4a1 mm: migrate: Add ... |
1386 |
trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason); |
b20a35035 [PATCH] page migr... |
1387 1388 |
if (!swapwrite) current->flags &= ~PF_SWAPWRITE; |
78bd52097 mm: adjust addres... |
1389 |
return rc; |
b20a35035 [PATCH] page migr... |
1390 |
} |
95a402c38 [PATCH] page migr... |
1391 |
|
742755a1d [PATCH] page migr... |
1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 |
#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 ... |
1415 1416 1417 |
if (PageHuge(p)) return alloc_huge_page_node(page_hstate(compound_head(p)), pm->node); |
e8db67eb0 mm: migrate: move... |
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 |
else if (thp_migration_supported() && PageTransHuge(p)) { struct page *thp; thp = alloc_pages_node(pm->node, (GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_RECLAIM, HPAGE_PMD_ORDER); if (!thp) return NULL; prep_transhuge_page(thp); return thp; } else |
96db800f5 mm: rename alloc_... |
1429 |
return __alloc_pages_node(pm->node, |
e97ca8e5b mm: fix GFP_THISN... |
1430 |
GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0); |
742755a1d [PATCH] page migr... |
1431 1432 1433 1434 1435 1436 |
} /* * 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... |
1437 |
* The pm array ends with node = MAX_NUMNODES. |
742755a1d [PATCH] page migr... |
1438 |
*/ |
5e9a0f023 mm: extract do_pa... |
1439 1440 1441 |
static int do_move_page_to_node_array(struct mm_struct *mm, struct page_to_node *pm, int migrate_all) |
742755a1d [PATCH] page migr... |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 |
{ 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... |
1452 1453 1454 |
for (pp = pm; pp->node != MAX_NUMNODES; pp++) { struct vm_area_struct *vma; struct page *page; |
e8db67eb0 mm: migrate: move... |
1455 1456 |
struct page *head; unsigned int follflags; |
742755a1d [PATCH] page migr... |
1457 |
|
742755a1d [PATCH] page migr... |
1458 1459 |
err = -EFAULT; vma = find_vma(mm, pp->addr); |
70384dc6d mm: fix error rep... |
1460 |
if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma)) |
742755a1d [PATCH] page migr... |
1461 |
goto set_status; |
d899844e9 mm: fix status co... |
1462 |
/* FOLL_DUMP to ignore special (like zero) pages */ |
e8db67eb0 mm: migrate: move... |
1463 1464 1465 1466 |
follflags = FOLL_GET | FOLL_DUMP; if (!thp_migration_supported()) follflags |= FOLL_SPLIT; page = follow_page(vma, pp->addr, follflags); |
89f5b7da2 Reinstate ZERO_PA... |
1467 1468 1469 1470 |
err = PTR_ERR(page); if (IS_ERR(page)) goto set_status; |
742755a1d [PATCH] page migr... |
1471 1472 1473 |
err = -ENOENT; if (!page) goto set_status; |
742755a1d [PATCH] page migr... |
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 |
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 ... |
1486 |
if (PageHuge(page)) { |
e8db67eb0 mm: migrate: move... |
1487 |
if (PageHead(page)) { |
e66f17ff7 mm/hugetlb: take ... |
1488 |
isolate_huge_page(page, &pagelist); |
e8db67eb0 mm: migrate: move... |
1489 1490 1491 |
err = 0; pp->page = page; } |
e632a938d mm: migrate: add ... |
1492 1493 |
goto put_and_set; } |
e8db67eb0 mm: migrate: move... |
1494 1495 1496 |
pp->page = compound_head(page); head = compound_head(page); err = isolate_lru_page(head); |
6d9c285a6 mm: move inc_zone... |
1497 |
if (!err) { |
e8db67eb0 mm: migrate: move... |
1498 1499 1500 1501 |
list_add_tail(&head->lru, &pagelist); mod_node_page_state(page_pgdat(head), NR_ISOLATED_ANON + page_is_file_cache(head), hpage_nr_pages(head)); |
6d9c285a6 mm: move inc_zone... |
1502 |
} |
742755a1d [PATCH] page migr... |
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 |
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... |
1513 |
err = 0; |
cf608ac19 mm: compaction: f... |
1514 |
if (!list_empty(&pagelist)) { |
68711a746 mm, migration: ad... |
1515 |
err = migrate_pages(&pagelist, new_page_node, NULL, |
9c620e2bc mm: remove offlin... |
1516 |
(unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL); |
cf608ac19 mm: compaction: f... |
1517 |
if (err) |
e632a938d mm: migrate: add ... |
1518 |
putback_movable_pages(&pagelist); |
cf608ac19 mm: compaction: f... |
1519 |
} |
742755a1d [PATCH] page migr... |
1520 1521 1522 1523 1524 1525 |
up_read(&mm->mmap_sem); return err; } /* |
5e9a0f023 mm: extract do_pa... |
1526 1527 1528 |
* Migrate an array of page address onto an array of nodes and fill * the corresponding array of status. */ |
3268c63ed mm: fix move/migr... |
1529 |
static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, |
5e9a0f023 mm: extract do_pa... |
1530 1531 1532 1533 1534 |
unsigned long nr_pages, const void __user * __user *pages, const int __user *nodes, int __user *status, int flags) { |
3140a2273 mm: rework do_pag... |
1535 |
struct page_to_node *pm; |
3140a2273 mm: rework do_pag... |
1536 1537 1538 |
unsigned long chunk_nr_pages; unsigned long chunk_start; int err; |
5e9a0f023 mm: extract do_pa... |
1539 |
|
3140a2273 mm: rework do_pag... |
1540 1541 1542 |
err = -ENOMEM; pm = (struct page_to_node *)__get_free_page(GFP_KERNEL); if (!pm) |
5e9a0f023 mm: extract do_pa... |
1543 |
goto out; |
35282a2de migration: only m... |
1544 1545 |
migrate_prep(); |
5e9a0f023 mm: extract do_pa... |
1546 |
/* |
3140a2273 mm: rework do_pag... |
1547 1548 |
* Store a chunk of page_to_node array in a page, * but keep the last one as a marker |
5e9a0f023 mm: extract do_pa... |
1549 |
*/ |
3140a2273 mm: rework do_pag... |
1550 |
chunk_nr_pages = (PAGE_SIZE / sizeof(struct page_to_node)) - 1; |
5e9a0f023 mm: extract do_pa... |
1551 |
|
3140a2273 mm: rework do_pag... |
1552 1553 1554 1555 |
for (chunk_start = 0; chunk_start < nr_pages; chunk_start += chunk_nr_pages) { int j; |
5e9a0f023 mm: extract do_pa... |
1556 |
|
3140a2273 mm: rework do_pag... |
1557 1558 1559 1560 1561 1562 |
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... |
1563 |
int node; |
3140a2273 mm: rework do_pag... |
1564 1565 1566 1567 1568 1569 |
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... |
1570 1571 1572 |
goto out_pm; err = -ENODEV; |
6f5a55f1a Fix potential cra... |
1573 1574 |
if (node < 0 || node >= MAX_NUMNODES) goto out_pm; |
389162c22 mm,migrate: use N... |
1575 |
if (!node_state(node, N_MEMORY)) |
5e9a0f023 mm: extract do_pa... |
1576 1577 1578 1579 1580 |
goto out_pm; err = -EACCES; if (!node_isset(node, task_nodes)) goto out_pm; |
3140a2273 mm: rework do_pag... |
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 |
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... |
1592 |
|
5e9a0f023 mm: extract do_pa... |
1593 |
/* Return status information */ |
3140a2273 mm: rework do_pag... |
1594 1595 |
for (j = 0; j < chunk_nr_pages; j++) if (put_user(pm[j].status, status + j + chunk_start)) { |
5e9a0f023 mm: extract do_pa... |
1596 |
err = -EFAULT; |
3140a2273 mm: rework do_pag... |
1597 1598 1599 1600 |
goto out_pm; } } err = 0; |
5e9a0f023 mm: extract do_pa... |
1601 1602 |
out_pm: |
3140a2273 mm: rework do_pag... |
1603 |
free_page((unsigned long)pm); |
5e9a0f023 mm: extract do_pa... |
1604 1605 1606 1607 1608 |
out: return err; } /* |
2f007e74b mm: don't vmalloc... |
1609 |
* Determine the nodes of an array of pages and store it in an array of status. |
742755a1d [PATCH] page migr... |
1610 |
*/ |
80bba1290 mm: no get_user/p... |
1611 1612 |
static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages, const void __user **pages, int *status) |
742755a1d [PATCH] page migr... |
1613 |
{ |
2f007e74b mm: don't vmalloc... |
1614 |
unsigned long i; |
2f007e74b mm: don't vmalloc... |
1615 |
|
742755a1d [PATCH] page migr... |
1616 |
down_read(&mm->mmap_sem); |
2f007e74b mm: don't vmalloc... |
1617 |
for (i = 0; i < nr_pages; i++) { |
80bba1290 mm: no get_user/p... |
1618 |
unsigned long addr = (unsigned long)(*pages); |
742755a1d [PATCH] page migr... |
1619 1620 |
struct vm_area_struct *vma; struct page *page; |
c095adbc2 mm: Don't touch u... |
1621 |
int err = -EFAULT; |
2f007e74b mm: don't vmalloc... |
1622 1623 |
vma = find_vma(mm, addr); |
70384dc6d mm: fix error rep... |
1624 |
if (!vma || addr < vma->vm_start) |
742755a1d [PATCH] page migr... |
1625 |
goto set_status; |
d899844e9 mm: fix status co... |
1626 1627 |
/* FOLL_DUMP to ignore special (like zero) pages */ page = follow_page(vma, addr, FOLL_DUMP); |
89f5b7da2 Reinstate ZERO_PA... |
1628 1629 1630 1631 |
err = PTR_ERR(page); if (IS_ERR(page)) goto set_status; |
d899844e9 mm: fix status co... |
1632 |
err = page ? page_to_nid(page) : -ENOENT; |
742755a1d [PATCH] page migr... |
1633 |
set_status: |
80bba1290 mm: no get_user/p... |
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 |
*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... |
1654 |
|
87b8d1ade mm: Make copy_fro... |
1655 1656 |
while (nr_pages) { unsigned long chunk_nr; |
80bba1290 mm: no get_user/p... |
1657 |
|
87b8d1ade mm: Make copy_fro... |
1658 1659 1660 1661 1662 1663 |
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... |
1664 1665 |
do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status); |
87b8d1ade mm: Make copy_fro... |
1666 1667 |
if (copy_to_user(status, chunk_status, chunk_nr * sizeof(*status))) break; |
742755a1d [PATCH] page migr... |
1668 |
|
87b8d1ade mm: Make copy_fro... |
1669 1670 1671 1672 1673 |
pages += chunk_nr; status += chunk_nr; nr_pages -= chunk_nr; } return nr_pages ? -EFAULT : 0; |
742755a1d [PATCH] page migr... |
1674 1675 1676 1677 1678 1679 |
} /* * Move a list of pages in the address space of the currently executing * process. */ |
938bb9f5e [CVE-2009-0029] S... |
1680 1681 1682 1683 |
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... |
1684 |
{ |
742755a1d [PATCH] page migr... |
1685 |
struct task_struct *task; |
742755a1d [PATCH] page migr... |
1686 |
struct mm_struct *mm; |
5e9a0f023 mm: extract do_pa... |
1687 |
int err; |
3268c63ed mm: fix move/migr... |
1688 |
nodemask_t task_nodes; |
742755a1d [PATCH] page migr... |
1689 1690 1691 1692 1693 1694 1695 1696 1697 |
/* 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... |
1698 |
rcu_read_lock(); |
228ebcbe6 Uninline find_tas... |
1699 |
task = pid ? find_task_by_vpid(pid) : current; |
742755a1d [PATCH] page migr... |
1700 |
if (!task) { |
a879bf582 mm: grab rcu read... |
1701 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1702 1703 |
return -ESRCH; } |
3268c63ed mm: fix move/migr... |
1704 |
get_task_struct(task); |
742755a1d [PATCH] page migr... |
1705 1706 1707 |
/* * Check if this process has the right to modify the specified |
197e7e521 Sanitize 'move_pa... |
1708 |
* process. Use the regular "ptrace_may_access()" checks. |
742755a1d [PATCH] page migr... |
1709 |
*/ |
197e7e521 Sanitize 'move_pa... |
1710 |
if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { |
c69e8d9c0 CRED: Use RCU to ... |
1711 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1712 |
err = -EPERM; |
5e9a0f023 mm: extract do_pa... |
1713 |
goto out; |
742755a1d [PATCH] page migr... |
1714 |
} |
c69e8d9c0 CRED: Use RCU to ... |
1715 |
rcu_read_unlock(); |
742755a1d [PATCH] page migr... |
1716 |
|
86c3a7645 [PATCH] SELinux: ... |
1717 1718 |
err = security_task_movememory(task); if (err) |
5e9a0f023 mm: extract do_pa... |
1719 |
goto out; |
86c3a7645 [PATCH] SELinux: ... |
1720 |
|
3268c63ed mm: fix move/migr... |
1721 1722 1723 |
task_nodes = cpuset_mems_allowed(task); mm = get_task_mm(task); put_task_struct(task); |
6e8b09eaf mm: fix NULL ptr ... |
1724 1725 1726 1727 1728 1729 1730 1731 |
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... |
1732 |
|
742755a1d [PATCH] page migr... |
1733 1734 |
mmput(mm); return err; |
3268c63ed mm: fix move/migr... |
1735 1736 1737 1738 |
out: put_task_struct(task); return err; |
742755a1d [PATCH] page migr... |
1739 |
} |
742755a1d [PATCH] page migr... |
1740 |
|
7039e1dbe mm: migrate: Intr... |
1741 1742 1743 1744 1745 1746 |
#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... |
1747 |
unsigned long nr_migrate_pages) |
7039e1dbe mm: migrate: Intr... |
1748 1749 |
{ int z; |
599d0c954 mm, vmscan: move ... |
1750 |
|
7039e1dbe mm: migrate: Intr... |
1751 1752 1753 1754 1755 |
for (z = pgdat->nr_zones - 1; z >= 0; z--) { struct zone *zone = pgdat->node_zones + z; if (!populated_zone(zone)) continue; |
7039e1dbe mm: migrate: Intr... |
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 |
/* 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; |
96db800f5 mm: rename alloc_... |
1773 |
newpage = __alloc_pages_node(nid, |
e97ca8e5b mm: fix GFP_THISN... |
1774 1775 1776 |
(GFP_HIGHUSER_MOVABLE | __GFP_THISNODE | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & |
8479eba77 mm: numa: quickly... |
1777 |
~__GFP_RECLAIM, 0); |
bac0382c6 mm: numa: migrate... |
1778 |
|
7039e1dbe mm: migrate: Intr... |
1779 1780 1781 1782 |
return newpage; } /* |
a8f607721 mm: numa: Rate li... |
1783 1784 1785 1786 1787 1788 |
* 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. */ static unsigned int migrate_interval_millisecs __read_mostly = 100; static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT); |
b32967ff1 mm: numa: Add THP... |
1789 |
/* Returns true if the node is migrate rate-limited after the update */ |
1c30e0177 mm: numa: make NU... |
1790 1791 |
static bool numamigrate_update_ratelimit(pg_data_t *pgdat, unsigned long nr_pages) |
7039e1dbe mm: migrate: Intr... |
1792 |
{ |
a8f607721 mm: numa: Rate li... |
1793 1794 1795 1796 1797 |
/* * 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... |
1798 |
if (time_after(jiffies, pgdat->numabalancing_migrate_next_window)) { |
1c5e9c27c mm: numa: limit s... |
1799 |
spin_lock(&pgdat->numabalancing_migrate_lock); |
a8f607721 mm: numa: Rate li... |
1800 1801 1802 |
pgdat->numabalancing_migrate_nr_pages = 0; pgdat->numabalancing_migrate_next_window = jiffies + msecs_to_jiffies(migrate_interval_millisecs); |
1c5e9c27c mm: numa: limit s... |
1803 |
spin_unlock(&pgdat->numabalancing_migrate_lock); |
a8f607721 mm: numa: Rate li... |
1804 |
} |
af1839d72 mm: numa: trace t... |
1805 1806 1807 |
if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) { trace_mm_numa_migrate_ratelimit(current, pgdat->node_id, nr_pages); |
1c5e9c27c mm: numa: limit s... |
1808 |
return true; |
af1839d72 mm: numa: trace t... |
1809 |
} |
1c5e9c27c mm: numa: limit s... |
1810 1811 1812 1813 1814 1815 1816 1817 1818 |
/* * 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... |
1819 |
} |
1c30e0177 mm: numa: make NU... |
1820 |
static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page) |
b32967ff1 mm: numa: Add THP... |
1821 |
{ |
340ef3902 mm: numa: cleanup... |
1822 |
int page_lru; |
a8f607721 mm: numa: Rate li... |
1823 |
|
309381fea mm: dump page whe... |
1824 |
VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page); |
3abef4e6c mm: numa: take TH... |
1825 |
|
7039e1dbe mm: migrate: Intr... |
1826 |
/* Avoid migrating to a node that is nearly full */ |
340ef3902 mm: numa: cleanup... |
1827 1828 |
if (!migrate_balanced_pgdat(pgdat, 1UL << compound_order(page))) return 0; |
7039e1dbe mm: migrate: Intr... |
1829 |
|
340ef3902 mm: numa: cleanup... |
1830 1831 |
if (isolate_lru_page(page)) return 0; |
7039e1dbe mm: migrate: Intr... |
1832 |
|
340ef3902 mm: numa: cleanup... |
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 |
/* * 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... |
1843 |
} |
340ef3902 mm: numa: cleanup... |
1844 |
page_lru = page_is_file_cache(page); |
599d0c954 mm, vmscan: move ... |
1845 |
mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru, |
340ef3902 mm: numa: cleanup... |
1846 |
hpage_nr_pages(page)); |
149c33e1c mm: migrate: Drop... |
1847 |
/* |
340ef3902 mm: numa: cleanup... |
1848 1849 1850 |
* 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... |
1851 1852 |
*/ put_page(page); |
340ef3902 mm: numa: cleanup... |
1853 |
return 1; |
b32967ff1 mm: numa: Add THP... |
1854 |
} |
de466bd62 mm: numa: avoid u... |
1855 1856 1857 1858 1859 |
bool pmd_trans_migrating(pmd_t pmd) { struct page *page = pmd_page(pmd); return PageLocked(page); } |
b32967ff1 mm: numa: Add THP... |
1860 1861 1862 1863 1864 |
/* * 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... |
1865 1866 |
int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma, int node) |
b32967ff1 mm: numa: Add THP... |
1867 1868 |
{ pg_data_t *pgdat = NODE_DATA(node); |
340ef3902 mm: numa: cleanup... |
1869 |
int isolated; |
b32967ff1 mm: numa: Add THP... |
1870 1871 1872 1873 |
int nr_remaining; LIST_HEAD(migratepages); /* |
1bc115d87 mm: numa: Scan pa... |
1874 1875 |
* 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... |
1876 |
*/ |
1bc115d87 mm: numa: Scan pa... |
1877 1878 |
if (page_mapcount(page) != 1 && page_is_file_cache(page) && (vma->vm_flags & VM_EXEC)) |
b32967ff1 mm: numa: Add THP... |
1879 |
goto out; |
b32967ff1 mm: numa: Add THP... |
1880 1881 1882 1883 1884 1885 |
/* * 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... |
1886 |
if (numamigrate_update_ratelimit(pgdat, 1)) |
b32967ff1 mm: numa: Add THP... |
1887 |
goto out; |
b32967ff1 mm: numa: Add THP... |
1888 1889 1890 1891 1892 1893 |
isolated = numamigrate_isolate_page(pgdat, page); if (!isolated) goto out; list_add(&page->lru, &migratepages); |
9c620e2bc mm: remove offlin... |
1894 |
nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page, |
68711a746 mm, migration: ad... |
1895 1896 |
NULL, node, MIGRATE_ASYNC, MR_NUMA_MISPLACED); |
b32967ff1 mm: numa: Add THP... |
1897 |
if (nr_remaining) { |
59c82b70d mm/migrate: remov... |
1898 1899 |
if (!list_empty(&migratepages)) { list_del(&page->lru); |
599d0c954 mm, vmscan: move ... |
1900 |
dec_node_page_state(page, NR_ISOLATED_ANON + |
59c82b70d mm/migrate: remov... |
1901 1902 1903 |
page_is_file_cache(page)); putback_lru_page(page); } |
b32967ff1 mm: numa: Add THP... |
1904 1905 1906 |
isolated = 0; } else count_vm_numa_event(NUMA_PAGE_MIGRATE); |
7039e1dbe mm: migrate: Intr... |
1907 |
BUG_ON(!list_empty(&migratepages)); |
7039e1dbe mm: migrate: Intr... |
1908 |
return isolated; |
340ef3902 mm: numa: cleanup... |
1909 1910 1911 1912 |
out: put_page(page); return 0; |
7039e1dbe mm: migrate: Intr... |
1913 |
} |
220018d38 mm: numa: Add THP... |
1914 |
#endif /* CONFIG_NUMA_BALANCING */ |
b32967ff1 mm: numa: Add THP... |
1915 |
|
220018d38 mm: numa: Add THP... |
1916 |
#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
340ef3902 mm: numa: cleanup... |
1917 1918 1919 1920 |
/* * Migrates a THP to a given target node. page must be locked and is unlocked * before returning. */ |
b32967ff1 mm: numa: Add THP... |
1921 1922 1923 1924 1925 1926 |
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... |
1927 |
spinlock_t *ptl; |
b32967ff1 mm: numa: Add THP... |
1928 1929 1930 |
pg_data_t *pgdat = NODE_DATA(node); int isolated = 0; struct page *new_page = NULL; |
b32967ff1 mm: numa: Add THP... |
1931 |
int page_lru = page_is_file_cache(page); |
f714f4f20 mm: numa: call MM... |
1932 1933 |
unsigned long mmun_start = address & HPAGE_PMD_MASK; unsigned long mmun_end = mmun_start + HPAGE_PMD_SIZE; |
b32967ff1 mm: numa: Add THP... |
1934 1935 |
/* |
b32967ff1 mm: numa: Add THP... |
1936 1937 1938 1939 |
* 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... |
1940 |
if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR)) |
b32967ff1 mm: numa: Add THP... |
1941 1942 1943 |
goto out_dropref; new_page = alloc_pages_node(node, |
251603549 mm, thp: remove _... |
1944 |
(GFP_TRANSHUGE_LIGHT | __GFP_THISNODE), |
e97ca8e5b mm: fix GFP_THISN... |
1945 |
HPAGE_PMD_ORDER); |
340ef3902 mm: numa: cleanup... |
1946 1947 |
if (!new_page) goto out_fail; |
9a982250f thp: introduce de... |
1948 |
prep_transhuge_page(new_page); |
340ef3902 mm: numa: cleanup... |
1949 |
|
b32967ff1 mm: numa: Add THP... |
1950 |
isolated = numamigrate_isolate_page(pgdat, page); |
340ef3902 mm: numa: cleanup... |
1951 |
if (!isolated) { |
b32967ff1 mm: numa: Add THP... |
1952 |
put_page(new_page); |
340ef3902 mm: numa: cleanup... |
1953 |
goto out_fail; |
b32967ff1 mm: numa: Add THP... |
1954 |
} |
b0943d61b mm: numa: defer T... |
1955 |
|
b32967ff1 mm: numa: Add THP... |
1956 |
/* Prepare a page as a migration target */ |
48c935ad8 page-flags: defin... |
1957 |
__SetPageLocked(new_page); |
d44d363f6 mm: don't assume ... |
1958 1959 |
if (PageSwapBacked(page)) __SetPageSwapBacked(new_page); |
b32967ff1 mm: numa: Add THP... |
1960 1961 1962 1963 1964 1965 1966 1967 |
/* 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... |
1968 |
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); |
c4088ebdc mm: convert the r... |
1969 |
ptl = pmd_lock(mm, pmd); |
f4e177d12 mm/migrate.c: sta... |
1970 |
if (unlikely(!pmd_same(*pmd, entry) || !page_ref_freeze(page, 2))) { |
c4088ebdc mm: convert the r... |
1971 |
spin_unlock(ptl); |
f714f4f20 mm: numa: call MM... |
1972 |
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
b32967ff1 mm: numa: Add THP... |
1973 1974 1975 1976 1977 1978 |
/* Reverse changes made by migrate_page_copy() */ if (TestClearPageActive(new_page)) SetPageActive(page); if (TestClearPageUnevictable(new_page)) SetPageUnevictable(page); |
b32967ff1 mm: numa: Add THP... |
1979 1980 1981 |
unlock_page(new_page); put_page(new_page); /* Free it */ |
a54a407fb mm: Close races b... |
1982 1983 |
/* Retake the callers reference and putback on LRU */ get_page(page); |
b32967ff1 mm: numa: Add THP... |
1984 |
putback_lru_page(page); |
599d0c954 mm, vmscan: move ... |
1985 |
mod_node_page_state(page_pgdat(page), |
a54a407fb mm: Close races b... |
1986 |
NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR); |
eb4489f69 mm: numa: avoid u... |
1987 1988 |
goto out_unlock; |
b32967ff1 mm: numa: Add THP... |
1989 |
} |
101024596 mm: introduce do_... |
1990 |
entry = mk_huge_pmd(new_page, vma->vm_page_prot); |
2b4847e73 mm: numa: seriali... |
1991 |
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); |
b32967ff1 mm: numa: Add THP... |
1992 |
|
2b4847e73 mm: numa: seriali... |
1993 1994 1995 1996 1997 1998 1999 |
/* * 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... |
2000 |
flush_cache_range(vma, mmun_start, mmun_end); |
d281ee614 rmap: add argumen... |
2001 |
page_add_anon_rmap(new_page, vma, mmun_start, true); |
8809aa2d2 mm: clarify that ... |
2002 |
pmdp_huge_clear_flush_notify(vma, mmun_start, pmd); |
f714f4f20 mm: numa: call MM... |
2003 |
set_pmd_at(mm, mmun_start, pmd, entry); |
ce4a9cc57 mm,numa: fix upda... |
2004 |
update_mmu_cache_pmd(vma, address, &entry); |
2b4847e73 mm: numa: seriali... |
2005 |
|
f4e177d12 mm/migrate.c: sta... |
2006 |
page_ref_unfreeze(page, 2); |
51afb12ba mm: page migratio... |
2007 |
mlock_migrate_page(new_page, page); |
d281ee614 rmap: add argumen... |
2008 |
page_remove_rmap(page, true); |
7cd12b4ab mm, page_owner: t... |
2009 |
set_page_owner_migrate_reason(new_page, MR_NUMA_MISPLACED); |
2b4847e73 mm: numa: seriali... |
2010 |
|
c4088ebdc mm: convert the r... |
2011 |
spin_unlock(ptl); |
f714f4f20 mm: numa: call MM... |
2012 |
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
b32967ff1 mm: numa: Add THP... |
2013 |
|
11de9927f mm: numa: add mig... |
2014 2015 2016 |
/* Take an "isolate" reference and put new page on the LRU. */ get_page(new_page); putback_lru_page(new_page); |
b32967ff1 mm: numa: Add THP... |
2017 2018 2019 2020 2021 2022 2023 |
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); |
599d0c954 mm, vmscan: move ... |
2024 |
mod_node_page_state(page_pgdat(page), |
b32967ff1 mm: numa: Add THP... |
2025 2026 2027 |
NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR); return isolated; |
340ef3902 mm: numa: cleanup... |
2028 2029 |
out_fail: count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR); |
b32967ff1 mm: numa: Add THP... |
2030 |
out_dropref: |
2b4847e73 mm: numa: seriali... |
2031 2032 |
ptl = pmd_lock(mm, pmd); if (pmd_same(*pmd, entry)) { |
4d9424669 mm: convert p[te|... |
2033 |
entry = pmd_modify(entry, vma->vm_page_prot); |
f714f4f20 mm: numa: call MM... |
2034 |
set_pmd_at(mm, mmun_start, pmd, entry); |
2b4847e73 mm: numa: seriali... |
2035 2036 2037 |
update_mmu_cache_pmd(vma, address, &entry); } spin_unlock(ptl); |
a54a407fb mm: Close races b... |
2038 |
|
eb4489f69 mm: numa: avoid u... |
2039 |
out_unlock: |
340ef3902 mm: numa: cleanup... |
2040 |
unlock_page(page); |
b32967ff1 mm: numa: Add THP... |
2041 |
put_page(page); |
b32967ff1 mm: numa: Add THP... |
2042 2043 |
return 0; } |
7039e1dbe mm: migrate: Intr... |
2044 2045 2046 |
#endif /* CONFIG_NUMA_BALANCING */ #endif /* CONFIG_NUMA */ |
8763cb45a mm/migrate: new m... |
2047 |
|
6b368cd4a mm/hmm: avoid blo... |
2048 |
#if defined(CONFIG_MIGRATE_VMA_HELPER) |
8763cb45a mm/migrate: new m... |
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 |
struct migrate_vma { struct vm_area_struct *vma; unsigned long *dst; unsigned long *src; unsigned long cpages; unsigned long npages; unsigned long start; unsigned long end; }; static int migrate_vma_collect_hole(unsigned long start, unsigned long end, struct mm_walk *walk) { struct migrate_vma *migrate = walk->private; unsigned long addr; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { |
e20d103b6 mm/migrate: fix i... |
2067 |
migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE; |
8315ada7f mm/migrate: allow... |
2068 |
migrate->dst[migrate->npages] = 0; |
e20d103b6 mm/migrate: fix i... |
2069 |
migrate->npages++; |
8315ada7f mm/migrate: allow... |
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 |
migrate->cpages++; } return 0; } static int migrate_vma_collect_skip(unsigned long start, unsigned long end, struct mm_walk *walk) { struct migrate_vma *migrate = walk->private; unsigned long addr; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { |
8763cb45a mm/migrate: new m... |
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 |
migrate->dst[migrate->npages] = 0; migrate->src[migrate->npages++] = 0; } return 0; } static int migrate_vma_collect_pmd(pmd_t *pmdp, unsigned long start, unsigned long end, struct mm_walk *walk) { struct migrate_vma *migrate = walk->private; struct vm_area_struct *vma = walk->vma; struct mm_struct *mm = vma->vm_mm; |
8c3328f1f mm/migrate: migra... |
2099 |
unsigned long addr = start, unmapped = 0; |
8763cb45a mm/migrate: new m... |
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 |
spinlock_t *ptl; pte_t *ptep; again: if (pmd_none(*pmdp)) return migrate_vma_collect_hole(start, end, walk); if (pmd_trans_huge(*pmdp)) { struct page *page; ptl = pmd_lock(mm, pmdp); if (unlikely(!pmd_trans_huge(*pmdp))) { spin_unlock(ptl); goto again; } page = pmd_page(*pmdp); if (is_huge_zero_page(page)) { spin_unlock(ptl); split_huge_pmd(vma, pmdp, addr); if (pmd_trans_unstable(pmdp)) |
8315ada7f mm/migrate: allow... |
2121 |
return migrate_vma_collect_skip(start, end, |
8763cb45a mm/migrate: new m... |
2122 2123 2124 2125 2126 2127 2128 |
walk); } else { int ret; get_page(page); spin_unlock(ptl); if (unlikely(!trylock_page(page))) |
8315ada7f mm/migrate: allow... |
2129 |
return migrate_vma_collect_skip(start, end, |
8763cb45a mm/migrate: new m... |
2130 2131 2132 2133 |
walk); ret = split_huge_page(page); unlock_page(page); put_page(page); |
8315ada7f mm/migrate: allow... |
2134 2135 2136 2137 |
if (ret) return migrate_vma_collect_skip(start, end, walk); if (pmd_none(*pmdp)) |
8763cb45a mm/migrate: new m... |
2138 2139 2140 2141 2142 2143 |
return migrate_vma_collect_hole(start, end, walk); } } if (unlikely(pmd_bad(*pmdp))) |
8315ada7f mm/migrate: allow... |
2144 |
return migrate_vma_collect_skip(start, end, walk); |
8763cb45a mm/migrate: new m... |
2145 2146 |
ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl); |
8c3328f1f mm/migrate: migra... |
2147 |
arch_enter_lazy_mmu_mode(); |
8763cb45a mm/migrate: new m... |
2148 2149 2150 |
for (; addr < end; addr += PAGE_SIZE, ptep++) { unsigned long mpfn, pfn; struct page *page; |
8c3328f1f mm/migrate: migra... |
2151 |
swp_entry_t entry; |
8763cb45a mm/migrate: new m... |
2152 2153 2154 2155 |
pte_t pte; pte = *ptep; pfn = pte_pfn(pte); |
a5430dda8 mm/migrate: suppo... |
2156 |
if (pte_none(pte)) { |
8315ada7f mm/migrate: allow... |
2157 2158 2159 |
mpfn = MIGRATE_PFN_MIGRATE; migrate->cpages++; pfn = 0; |
8763cb45a mm/migrate: new m... |
2160 2161 |
goto next; } |
a5430dda8 mm/migrate: suppo... |
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 |
if (!pte_present(pte)) { mpfn = pfn = 0; /* * Only care about unaddressable device page special * page table entry. Other special swap entries are not * migratable, and we ignore regular swapped page. */ entry = pte_to_swp_entry(pte); if (!is_device_private_entry(entry)) goto next; page = device_private_entry_to_page(entry); mpfn = migrate_pfn(page_to_pfn(page))| MIGRATE_PFN_DEVICE | MIGRATE_PFN_MIGRATE; if (is_write_device_private_entry(entry)) mpfn |= MIGRATE_PFN_WRITE; } else { |
8315ada7f mm/migrate: allow... |
2180 2181 2182 2183 2184 2185 |
if (is_zero_pfn(pfn)) { mpfn = MIGRATE_PFN_MIGRATE; migrate->cpages++; pfn = 0; goto next; } |
df6ad6983 mm/device-public-... |
2186 |
page = _vm_normal_page(migrate->vma, addr, pte, true); |
a5430dda8 mm/migrate: suppo... |
2187 2188 2189 |
mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE; mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0; } |
8763cb45a mm/migrate: new m... |
2190 |
/* FIXME support THP */ |
8763cb45a mm/migrate: new m... |
2191 2192 2193 2194 |
if (!page || !page->mapping || PageTransCompound(page)) { mpfn = pfn = 0; goto next; } |
a5430dda8 mm/migrate: suppo... |
2195 |
pfn = page_to_pfn(page); |
8763cb45a mm/migrate: new m... |
2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 |
/* * By getting a reference on the page we pin it and that blocks * any kind of migration. Side effect is that it "freezes" the * pte. * * We drop this reference after isolating the page from the lru * for non device page (device page are not on the lru and thus * can't be dropped from it). */ get_page(page); migrate->cpages++; |
8763cb45a mm/migrate: new m... |
2208 |
|
8c3328f1f mm/migrate: migra... |
2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 |
/* * Optimize for the common case where page is only mapped once * in one process. If we can lock the page, then we can safely * set up a special migration page table entry now. */ if (trylock_page(page)) { pte_t swp_pte; mpfn |= MIGRATE_PFN_LOCKED; ptep_get_and_clear(mm, addr, ptep); /* Setup special migration page table entry */ entry = make_migration_entry(page, pte_write(pte)); swp_pte = swp_entry_to_pte(entry); if (pte_soft_dirty(pte)) swp_pte = pte_swp_mksoft_dirty(swp_pte); set_pte_at(mm, addr, ptep, swp_pte); /* * This is like regular unmap: we remove the rmap and * drop page refcount. Page won't be freed, as we took * a reference just above. */ page_remove_rmap(page, false); put_page(page); |
a5430dda8 mm/migrate: suppo... |
2234 2235 2236 |
if (pte_present(pte)) unmapped++; |
8c3328f1f mm/migrate: migra... |
2237 |
} |
8763cb45a mm/migrate: new m... |
2238 |
next: |
a5430dda8 mm/migrate: suppo... |
2239 |
migrate->dst[migrate->npages] = 0; |
8763cb45a mm/migrate: new m... |
2240 2241 |
migrate->src[migrate->npages++] = mpfn; } |
8c3328f1f mm/migrate: migra... |
2242 |
arch_leave_lazy_mmu_mode(); |
8763cb45a mm/migrate: new m... |
2243 |
pte_unmap_unlock(ptep - 1, ptl); |
8c3328f1f mm/migrate: migra... |
2244 2245 2246 |
/* Only flush the TLB if we actually modified any entries */ if (unmapped) flush_tlb_range(walk->vma, start, end); |
8763cb45a mm/migrate: new m... |
2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 |
return 0; } /* * migrate_vma_collect() - collect pages over a range of virtual addresses * @migrate: migrate struct containing all migration information * * This will walk the CPU page table. For each virtual address backed by a * valid page, it updates the src array and takes a reference on the page, in * order to pin the page until we lock it and unmap it. */ static void migrate_vma_collect(struct migrate_vma *migrate) { struct mm_walk mm_walk; mm_walk.pmd_entry = migrate_vma_collect_pmd; mm_walk.pte_entry = NULL; mm_walk.pte_hole = migrate_vma_collect_hole; mm_walk.hugetlb_entry = NULL; mm_walk.test_walk = NULL; mm_walk.vma = migrate->vma; mm_walk.mm = migrate->vma->vm_mm; mm_walk.private = migrate; |
8c3328f1f mm/migrate: migra... |
2270 2271 2272 |
mmu_notifier_invalidate_range_start(mm_walk.mm, migrate->start, migrate->end); |
8763cb45a mm/migrate: new m... |
2273 |
walk_page_range(migrate->start, migrate->end, &mm_walk); |
8c3328f1f mm/migrate: migra... |
2274 2275 2276 |
mmu_notifier_invalidate_range_end(mm_walk.mm, migrate->start, migrate->end); |
8763cb45a mm/migrate: new m... |
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 |
migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT); } /* * migrate_vma_check_page() - check if page is pinned or not * @page: struct page to check * * Pinned pages cannot be migrated. This is the same test as in * migrate_page_move_mapping(), except that here we allow migration of a * ZONE_DEVICE page. */ static bool migrate_vma_check_page(struct page *page) { /* * One extra ref because caller holds an extra reference, either from * isolate_lru_page() for a regular page, or migrate_vma_collect() for * a device page. */ int extra = 1; /* * FIXME support THP (transparent huge page), it is bit more complex to * check them than regular pages, because they can be mapped with a pmd * or with a pte (split pte mapping). */ if (PageCompound(page)) return false; |
a5430dda8 mm/migrate: suppo... |
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 |
/* Page from ZONE_DEVICE have one extra reference */ if (is_zone_device_page(page)) { /* * Private page can never be pin as they have no valid pte and * GUP will fail for those. Yet if there is a pending migration * a thread might try to wait on the pte migration entry and * will bump the page reference count. Sadly there is no way to * differentiate a regular pin from migration wait. Hence to * avoid 2 racing thread trying to migrate back to CPU to enter * infinite loop (one stoping migration because the other is * waiting on pte migration entry). We always return true here. * * FIXME proper solution is to rework migration_entry_wait() so * it does not need to take a reference on page. */ if (is_device_private_page(page)) return true; |
df6ad6983 mm/device-public-... |
2322 2323 2324 2325 2326 2327 2328 |
/* * Only allow device public page to be migrated and account for * the extra reference count imply by ZONE_DEVICE pages. */ if (!is_device_public_page(page)) return false; extra++; |
a5430dda8 mm/migrate: suppo... |
2329 |
} |
df6ad6983 mm/device-public-... |
2330 2331 2332 |
/* For file back page */ if (page_mapping(page)) extra += 1 + page_has_private(page); |
8763cb45a mm/migrate: new m... |
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 |
if ((page_count(page) - extra) > page_mapcount(page)) return false; return true; } /* * migrate_vma_prepare() - lock pages and isolate them from the lru * @migrate: migrate struct containing all migration information * * This locks pages that have been collected by migrate_vma_collect(). Once each * page is locked it is isolated from the lru (for non-device pages). Finally, * the ref taken by migrate_vma_collect() is dropped, as locked pages cannot be * migrated by concurrent kernel threads. */ static void migrate_vma_prepare(struct migrate_vma *migrate) { const unsigned long npages = migrate->npages; |
8c3328f1f mm/migrate: migra... |
2351 2352 |
const unsigned long start = migrate->start; unsigned long addr, i, restore = 0; |
8763cb45a mm/migrate: new m... |
2353 |
bool allow_drain = true; |
8763cb45a mm/migrate: new m... |
2354 2355 2356 2357 2358 |
lru_add_drain(); for (i = 0; (i < npages) && migrate->cpages; i++) { struct page *page = migrate_pfn_to_page(migrate->src[i]); |
8c3328f1f mm/migrate: migra... |
2359 |
bool remap = true; |
8763cb45a mm/migrate: new m... |
2360 2361 2362 |
if (!page) continue; |
8c3328f1f mm/migrate: migra... |
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 |
if (!(migrate->src[i] & MIGRATE_PFN_LOCKED)) { /* * Because we are migrating several pages there can be * a deadlock between 2 concurrent migration where each * are waiting on each other page lock. * * Make migrate_vma() a best effort thing and backoff * for any page we can not lock right away. */ if (!trylock_page(page)) { migrate->src[i] = 0; migrate->cpages--; put_page(page); continue; } remap = false; migrate->src[i] |= MIGRATE_PFN_LOCKED; |
8763cb45a mm/migrate: new m... |
2380 |
} |
8763cb45a mm/migrate: new m... |
2381 |
|
a5430dda8 mm/migrate: suppo... |
2382 2383 2384 2385 2386 2387 2388 |
/* ZONE_DEVICE pages are not on LRU */ if (!is_zone_device_page(page)) { if (!PageLRU(page) && allow_drain) { /* Drain CPU's pagevec */ lru_add_drain_all(); allow_drain = false; } |
8763cb45a mm/migrate: new m... |
2389 |
|
a5430dda8 mm/migrate: suppo... |
2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 |
if (isolate_lru_page(page)) { if (remap) { migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; migrate->cpages--; restore++; } else { migrate->src[i] = 0; unlock_page(page); migrate->cpages--; put_page(page); } continue; |
8c3328f1f mm/migrate: migra... |
2402 |
} |
a5430dda8 mm/migrate: suppo... |
2403 2404 2405 |
/* Drop the reference we took in collect */ put_page(page); |
8763cb45a mm/migrate: new m... |
2406 2407 2408 |
} if (!migrate_vma_check_page(page)) { |
8c3328f1f mm/migrate: migra... |
2409 2410 2411 2412 |
if (remap) { migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; migrate->cpages--; restore++; |
8763cb45a mm/migrate: new m... |
2413 |
|
a5430dda8 mm/migrate: suppo... |
2414 2415 2416 2417 |
if (!is_zone_device_page(page)) { get_page(page); putback_lru_page(page); } |
8c3328f1f mm/migrate: migra... |
2418 2419 2420 2421 |
} else { migrate->src[i] = 0; unlock_page(page); migrate->cpages--; |
a5430dda8 mm/migrate: suppo... |
2422 2423 2424 2425 |
if (!is_zone_device_page(page)) putback_lru_page(page); else put_page(page); |
8c3328f1f mm/migrate: migra... |
2426 |
} |
8763cb45a mm/migrate: new m... |
2427 2428 |
} } |
8c3328f1f mm/migrate: migra... |
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 |
for (i = 0, addr = start; i < npages && restore; i++, addr += PAGE_SIZE) { struct page *page = migrate_pfn_to_page(migrate->src[i]); if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE)) continue; remove_migration_pte(page, migrate->vma, addr, page); migrate->src[i] = 0; unlock_page(page); put_page(page); restore--; } |
8763cb45a mm/migrate: new m... |
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 |
} /* * migrate_vma_unmap() - replace page mapping with special migration pte entry * @migrate: migrate struct containing all migration information * * Replace page mapping (CPU page table pte) with a special migration pte entry * and check again if it has been pinned. Pinned pages are restored because we * cannot migrate them. * * This is the last step before we call the device driver callback to allocate * destination memory and copy contents of original page over to new page. */ static void migrate_vma_unmap(struct migrate_vma *migrate) { int flags = TTU_MIGRATION | TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS; const unsigned long npages = migrate->npages; const unsigned long start = migrate->start; unsigned long addr, i, restore = 0; for (i = 0; i < npages; i++) { struct page *page = migrate_pfn_to_page(migrate->src[i]); if (!page || !(migrate->src[i] & MIGRATE_PFN_MIGRATE)) continue; |
8c3328f1f mm/migrate: migra... |
2468 2469 2470 2471 |
if (page_mapped(page)) { try_to_unmap(page, flags); if (page_mapped(page)) goto restore; |
8763cb45a mm/migrate: new m... |
2472 |
} |
8c3328f1f mm/migrate: migra... |
2473 2474 2475 2476 2477 2478 2479 2480 |
if (migrate_vma_check_page(page)) continue; restore: migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; migrate->cpages--; restore++; |
8763cb45a mm/migrate: new m... |
2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 |
} for (addr = start, i = 0; i < npages && restore; addr += PAGE_SIZE, i++) { struct page *page = migrate_pfn_to_page(migrate->src[i]); if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE)) continue; remove_migration_ptes(page, page, false); migrate->src[i] = 0; unlock_page(page); restore--; |
a5430dda8 mm/migrate: suppo... |
2494 2495 2496 2497 |
if (is_zone_device_page(page)) put_page(page); else putback_lru_page(page); |
8763cb45a mm/migrate: new m... |
2498 2499 |
} } |
8315ada7f mm/migrate: allow... |
2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 |
static void migrate_vma_insert_page(struct migrate_vma *migrate, unsigned long addr, struct page *page, unsigned long *src, unsigned long *dst) { struct vm_area_struct *vma = migrate->vma; struct mm_struct *mm = vma->vm_mm; struct mem_cgroup *memcg; bool flush = false; spinlock_t *ptl; pte_t entry; pgd_t *pgdp; p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; /* Only allow populating anonymous memory */ if (!vma_is_anonymous(vma)) goto abort; pgdp = pgd_offset(mm, addr); p4dp = p4d_alloc(mm, pgdp, addr); if (!p4dp) goto abort; pudp = pud_alloc(mm, p4dp, addr); if (!pudp) goto abort; pmdp = pmd_alloc(mm, pudp, addr); if (!pmdp) goto abort; if (pmd_trans_huge(*pmdp) || pmd_devmap(*pmdp)) goto abort; /* * Use pte_alloc() instead of pte_alloc_map(). We can't run * pte_offset_map() on pmds where a huge pmd might be created * from a different thread. * * pte_alloc_map() is safe to use under down_write(mmap_sem) or when * parallel threads are excluded by other means. * * Here we only have down_read(mmap_sem). */ if (pte_alloc(mm, pmdp, addr)) goto abort; /* See the comment in pte_alloc_one_map() */ if (unlikely(pmd_trans_unstable(pmdp))) goto abort; if (unlikely(anon_vma_prepare(vma))) goto abort; if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL, &memcg, false)) goto abort; /* * The memory barrier inside __SetPageUptodate makes sure that * preceding stores to the page contents become visible before * the set_pte_at() write. */ __SetPageUptodate(page); |
df6ad6983 mm/device-public-... |
2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 |
if (is_zone_device_page(page)) { if (is_device_private_page(page)) { swp_entry_t swp_entry; swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE); entry = swp_entry_to_pte(swp_entry); } else if (is_device_public_page(page)) { entry = pte_mkold(mk_pte(page, READ_ONCE(vma->vm_page_prot))); if (vma->vm_flags & VM_WRITE) entry = pte_mkwrite(pte_mkdirty(entry)); entry = pte_mkdevmap(entry); } |
8315ada7f mm/migrate: allow... |
2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 |
} else { entry = mk_pte(page, vma->vm_page_prot); if (vma->vm_flags & VM_WRITE) entry = pte_mkwrite(pte_mkdirty(entry)); } ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl); if (pte_present(*ptep)) { unsigned long pfn = pte_pfn(*ptep); if (!is_zero_pfn(pfn)) { pte_unmap_unlock(ptep, ptl); mem_cgroup_cancel_charge(page, memcg, false); goto abort; } flush = true; } else if (!pte_none(*ptep)) { pte_unmap_unlock(ptep, ptl); mem_cgroup_cancel_charge(page, memcg, false); goto abort; } /* * Check for usefaultfd but do not deliver the fault. Instead, * just back off. */ if (userfaultfd_missing(vma)) { pte_unmap_unlock(ptep, ptl); mem_cgroup_cancel_charge(page, memcg, false); goto abort; } inc_mm_counter(mm, MM_ANONPAGES); page_add_new_anon_rmap(page, vma, addr, false); mem_cgroup_commit_charge(page, memcg, false, false); if (!is_zone_device_page(page)) lru_cache_add_active_or_unevictable(page, vma); get_page(page); if (flush) { flush_cache_page(vma, addr, pte_pfn(*ptep)); ptep_clear_flush_notify(vma, addr, ptep); set_pte_at_notify(mm, addr, ptep, entry); update_mmu_cache(vma, addr, ptep); } else { /* No need to invalidate - it was non-present before */ set_pte_at(mm, addr, ptep, entry); update_mmu_cache(vma, addr, ptep); } pte_unmap_unlock(ptep, ptl); *src = MIGRATE_PFN_MIGRATE; return; abort: *src &= ~MIGRATE_PFN_MIGRATE; } |
8763cb45a mm/migrate: new m... |
2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 |
/* * migrate_vma_pages() - migrate meta-data from src page to dst page * @migrate: migrate struct containing all migration information * * This migrates struct page meta-data from source struct page to destination * struct page. This effectively finishes the migration from source page to the * destination page. */ static void migrate_vma_pages(struct migrate_vma *migrate) { const unsigned long npages = migrate->npages; const unsigned long start = migrate->start; |
8315ada7f mm/migrate: allow... |
2646 2647 2648 2649 |
struct vm_area_struct *vma = migrate->vma; struct mm_struct *mm = vma->vm_mm; unsigned long addr, i, mmu_start; bool notified = false; |
8763cb45a mm/migrate: new m... |
2650 2651 2652 2653 2654 2655 |
for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) { struct page *newpage = migrate_pfn_to_page(migrate->dst[i]); struct page *page = migrate_pfn_to_page(migrate->src[i]); struct address_space *mapping; int r; |
8315ada7f mm/migrate: allow... |
2656 2657 |
if (!newpage) { migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; |
8763cb45a mm/migrate: new m... |
2658 |
continue; |
8315ada7f mm/migrate: allow... |
2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 |
} if (!page) { if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE)) { continue; } if (!notified) { mmu_start = addr; notified = true; mmu_notifier_invalidate_range_start(mm, mmu_start, migrate->end); } migrate_vma_insert_page(migrate, addr, newpage, &migrate->src[i], &migrate->dst[i]); |
8763cb45a mm/migrate: new m... |
2675 |
continue; |
8315ada7f mm/migrate: allow... |
2676 |
} |
8763cb45a mm/migrate: new m... |
2677 2678 |
mapping = page_mapping(page); |
a5430dda8 mm/migrate: suppo... |
2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 |
if (is_zone_device_page(newpage)) { if (is_device_private_page(newpage)) { /* * For now only support private anonymous when * migrating to un-addressable device memory. */ if (mapping) { migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; continue; } |
df6ad6983 mm/device-public-... |
2689 |
} else if (!is_device_public_page(newpage)) { |
a5430dda8 mm/migrate: suppo... |
2690 2691 2692 2693 2694 2695 2696 2697 |
/* * Other types of ZONE_DEVICE page are not * supported. */ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; continue; } } |
8763cb45a mm/migrate: new m... |
2698 2699 2700 2701 |
r = migrate_page(mapping, newpage, page, MIGRATE_SYNC_NO_COPY); if (r != MIGRATEPAGE_SUCCESS) migrate->src[i] &= ~MIGRATE_PFN_MIGRATE; } |
8315ada7f mm/migrate: allow... |
2702 2703 2704 2705 |
if (notified) mmu_notifier_invalidate_range_end(mm, mmu_start, migrate->end); |
8763cb45a mm/migrate: new m... |
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 |
} /* * migrate_vma_finalize() - restore CPU page table entry * @migrate: migrate struct containing all migration information * * This replaces the special migration pte entry with either a mapping to the * new page if migration was successful for that page, or to the original page * otherwise. * * This also unlocks the pages and puts them back on the lru, or drops the extra * refcount, for device pages. */ static void migrate_vma_finalize(struct migrate_vma *migrate) { const unsigned long npages = migrate->npages; unsigned long i; for (i = 0; i < npages; i++) { struct page *newpage = migrate_pfn_to_page(migrate->dst[i]); struct page *page = migrate_pfn_to_page(migrate->src[i]); |
8315ada7f mm/migrate: allow... |
2727 2728 2729 2730 2731 |
if (!page) { if (newpage) { unlock_page(newpage); put_page(newpage); } |
8763cb45a mm/migrate: new m... |
2732 |
continue; |
8315ada7f mm/migrate: allow... |
2733 |
} |
8763cb45a mm/migrate: new m... |
2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 |
if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE) || !newpage) { if (newpage) { unlock_page(newpage); put_page(newpage); } newpage = page; } remove_migration_ptes(page, newpage, false); unlock_page(page); migrate->cpages--; |
a5430dda8 mm/migrate: suppo... |
2745 2746 2747 2748 |
if (is_zone_device_page(page)) put_page(page); else putback_lru_page(page); |
8763cb45a mm/migrate: new m... |
2749 2750 2751 |
if (newpage != page) { unlock_page(newpage); |
a5430dda8 mm/migrate: suppo... |
2752 2753 2754 2755 |
if (is_zone_device_page(newpage)) put_page(newpage); else putback_lru_page(newpage); |
8763cb45a mm/migrate: new m... |
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} } } /* * migrate_vma() - migrate a range of memory inside vma * * @ops: migration callback for allocating destination memory and copying * @vma: virtual memory area containing the range to be migrated * @start: start address of the range to migrate (inclusive) * @end: end address of the range to migrate (exclusive) * @src: array of hmm_pfn_t containing source pfns * @dst: array of hmm_pfn_t containing destination pfns * @private: pointer passed back to each of the callback * Returns: 0 on success, error code otherwise * * This function tries to migrate a range of memory virtual address range, using * callbacks to allocate and copy memory from source to destination. First it * collects all the pages backing each virtual address in the range, saving this * inside the src array. Then it locks those pages and unmaps them. Once the pages * are locked and unmapped, it checks whether each page is pinned or not. Pages * that aren't pinned have the MIGRATE_PFN_MIGRATE flag set (by this function) * in the corresponding src array entry. It then restores any pages that are * pinned, by remapping and unlocking those pages. * * At this point it calls the alloc_and_copy() callback. For documentation on * what is expected from that callback, see struct migrate_vma_ops comments in * include/linux/migrate.h * * After the alloc_and_copy() callback, this function goes over each entry in * the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag * set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set, * then the function tries to migrate struct page information from the source * struct page to the destination struct page. If it fails to migrate the struct * page information, then it clears the MIGRATE_PFN_MIGRATE flag in the src * array. * * At this point all successfully migrated pages have an entry in the src * array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst * array entry with MIGRATE_PFN_VALID flag set. * * It then calls the finalize_and_map() callback. See comments for "struct * migrate_vma_ops", in include/linux/migrate.h for details about * finalize_and_map() behavior. * * After the finalize_and_map() callback, for successfully migrated pages, this * function updates the CPU page table to point to new pages, otherwise it * restores the CPU page table to point to the original source pages. * * Function returns 0 after the above steps, even if no pages were migrated * (The function only returns an error if any of the arguments are invalid.) * * Both src and dst array must be big enough for (end - start) >> PAGE_SHIFT * unsigned long entries. */ int migrate_vma(const struct migrate_vma_ops *ops, struct vm_area_struct *vma, unsigned long start, unsigned long end, unsigned long *src, unsigned long *dst, void *private) { struct migrate_vma migrate; /* Sanity check the arguments */ start &= PAGE_MASK; end &= PAGE_MASK; if (!vma || is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_SPECIAL)) return -EINVAL; if (start < vma->vm_start || start >= vma->vm_end) return -EINVAL; if (end <= vma->vm_start || end > vma->vm_end) return -EINVAL; if (!ops || !src || !dst || start >= end) return -EINVAL; memset(src, 0, sizeof(*src) * ((end - start) >> PAGE_SHIFT)); migrate.src = src; migrate.dst = dst; migrate.start = start; migrate.npages = 0; migrate.cpages = 0; migrate.end = end; migrate.vma = vma; /* Collect, and try to unmap source pages */ migrate_vma_collect(&migrate); if (!migrate.cpages) return 0; /* Lock and isolate page */ migrate_vma_prepare(&migrate); if (!migrate.cpages) return 0; /* Unmap pages */ migrate_vma_unmap(&migrate); if (!migrate.cpages) return 0; /* * At this point pages are locked and unmapped, and thus they have * stable content and can safely be copied to destination memory that * is allocated by the callback. * * Note that migration can fail in migrate_vma_struct_page() for each * individual page. */ ops->alloc_and_copy(vma, src, dst, start, end, private); /* This does the real migration of struct page */ migrate_vma_pages(&migrate); ops->finalize_and_map(vma, src, dst, start, end, private); /* Unlock and remap pages */ migrate_vma_finalize(&migrate); return 0; } EXPORT_SYMBOL(migrate_vma); |
6b368cd4a mm/hmm: avoid blo... |
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#endif /* defined(MIGRATE_VMA_HELPER) */ |