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mm/madvise.c
29 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/mm/madvise.c * * Copyright (C) 1999 Linus Torvalds * Copyright (C) 2002 Christoph Hellwig */ #include <linux/mman.h> #include <linux/pagemap.h> #include <linux/syscalls.h> |
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#include <linux/mempolicy.h> |
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#include <linux/page-isolation.h> |
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#include <linux/page_idle.h> |
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#include <linux/userfaultfd_k.h> |
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#include <linux/hugetlb.h> |
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#include <linux/falloc.h> |
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#include <linux/fadvise.h> |
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#include <linux/sched.h> |
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#include <linux/ksm.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include <linux/pagewalk.h> |
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#include <linux/swap.h> #include <linux/swapops.h> |
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#include <linux/shmem_fs.h> |
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#include <linux/mmu_notifier.h> #include <asm/tlb.h> |
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|
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#include "internal.h" |
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struct madvise_walk_private { struct mmu_gather *tlb; bool pageout; }; |
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/* |
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* Any behaviour which results in changes to the vma->vm_flags needs to * take mmap_sem for writing. Others, which simply traverse vmas, need * to only take it for reading. */ static int madvise_need_mmap_write(int behavior) { switch (behavior) { case MADV_REMOVE: case MADV_WILLNEED: case MADV_DONTNEED: |
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case MADV_COLD: |
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case MADV_PAGEOUT: |
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case MADV_FREE: |
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return 0; default: /* be safe, default to 1. list exceptions explicitly */ return 1; } } /* |
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* We can potentially split a vm area into separate * areas, each area with its own behavior. */ |
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static long madvise_behavior(struct vm_area_struct *vma, |
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struct vm_area_struct **prev, unsigned long start, unsigned long end, int behavior) |
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{ |
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struct mm_struct *mm = vma->vm_mm; |
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int error = 0; |
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pgoff_t pgoff; |
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unsigned long new_flags = vma->vm_flags; |
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switch (behavior) { |
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case MADV_NORMAL: new_flags = new_flags & ~VM_RAND_READ & ~VM_SEQ_READ; break; |
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case MADV_SEQUENTIAL: |
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new_flags = (new_flags & ~VM_RAND_READ) | VM_SEQ_READ; |
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break; case MADV_RANDOM: |
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new_flags = (new_flags & ~VM_SEQ_READ) | VM_RAND_READ; |
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break; |
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case MADV_DONTFORK: new_flags |= VM_DONTCOPY; break; case MADV_DOFORK: |
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if (vma->vm_flags & VM_IO) { error = -EINVAL; goto out; } |
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new_flags &= ~VM_DONTCOPY; |
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break; |
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case MADV_WIPEONFORK: /* MADV_WIPEONFORK is only supported on anonymous memory. */ if (vma->vm_file || vma->vm_flags & VM_SHARED) { error = -EINVAL; goto out; } new_flags |= VM_WIPEONFORK; break; case MADV_KEEPONFORK: new_flags &= ~VM_WIPEONFORK; break; |
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case MADV_DONTDUMP: |
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new_flags |= VM_DONTDUMP; |
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break; case MADV_DODUMP: |
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if (!is_vm_hugetlb_page(vma) && new_flags & VM_SPECIAL) { |
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error = -EINVAL; goto out; } new_flags &= ~VM_DONTDUMP; |
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break; |
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case MADV_MERGEABLE: case MADV_UNMERGEABLE: error = ksm_madvise(vma, start, end, behavior, &new_flags); |
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if (error) goto out_convert_errno; |
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break; |
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case MADV_HUGEPAGE: |
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case MADV_NOHUGEPAGE: |
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error = hugepage_madvise(vma, &new_flags, behavior); |
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if (error) goto out_convert_errno; |
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break; |
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} |
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if (new_flags == vma->vm_flags) { *prev = vma; |
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goto out; |
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} pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); *prev = vma_merge(mm, *prev, start, end, new_flags, vma->anon_vma, |
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vma->vm_file, pgoff, vma_policy(vma), vma->vm_userfaultfd_ctx); |
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if (*prev) { vma = *prev; goto success; } *prev = vma; |
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if (start != vma->vm_start) { |
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if (unlikely(mm->map_count >= sysctl_max_map_count)) { error = -ENOMEM; |
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goto out; |
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} error = __split_vma(mm, vma, start, 1); |
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if (error) goto out_convert_errno; |
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} if (end != vma->vm_end) { |
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if (unlikely(mm->map_count >= sysctl_max_map_count)) { error = -ENOMEM; |
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goto out; |
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} error = __split_vma(mm, vma, end, 0); |
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if (error) goto out_convert_errno; |
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} |
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success: |
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/* * vm_flags is protected by the mmap_sem held in write mode. */ |
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vma->vm_flags = new_flags; |
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out_convert_errno: /* * madvise() returns EAGAIN if kernel resources, such as * slab, are temporarily unavailable. */ if (error == -ENOMEM) error = -EAGAIN; |
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out: |
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return error; } |
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#ifdef CONFIG_SWAP static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start, unsigned long end, struct mm_walk *walk) { pte_t *orig_pte; struct vm_area_struct *vma = walk->private; unsigned long index; if (pmd_none_or_trans_huge_or_clear_bad(pmd)) return 0; for (index = start; index != end; index += PAGE_SIZE) { pte_t pte; swp_entry_t entry; struct page *page; spinlock_t *ptl; orig_pte = pte_offset_map_lock(vma->vm_mm, pmd, start, &ptl); pte = *(orig_pte + ((index - start) / PAGE_SIZE)); pte_unmap_unlock(orig_pte, ptl); |
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if (pte_present(pte) || pte_none(pte)) |
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continue; entry = pte_to_swp_entry(pte); if (unlikely(non_swap_entry(entry))) continue; page = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE, |
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vma, index, false); |
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if (page) |
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put_page(page); |
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} return 0; } |
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static const struct mm_walk_ops swapin_walk_ops = { .pmd_entry = swapin_walk_pmd_entry, }; |
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static void force_shm_swapin_readahead(struct vm_area_struct *vma, unsigned long start, unsigned long end, struct address_space *mapping) { pgoff_t index; struct page *page; swp_entry_t swap; for (; start < end; start += PAGE_SIZE) { index = ((start - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; |
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page = find_get_entry(mapping, index); |
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if (!xa_is_value(page)) { |
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if (page) |
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put_page(page); |
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continue; } swap = radix_to_swp_entry(page); page = read_swap_cache_async(swap, GFP_HIGHUSER_MOVABLE, |
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NULL, 0, false); |
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if (page) |
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put_page(page); |
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} lru_add_drain(); /* Push any new pages onto the LRU now */ } #endif /* CONFIG_SWAP */ |
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/* * Schedule all required I/O operations. Do not wait for completion. */ |
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static long madvise_willneed(struct vm_area_struct *vma, struct vm_area_struct **prev, |
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unsigned long start, unsigned long end) { struct file *file = vma->vm_file; |
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loff_t offset; |
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|
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*prev = vma; |
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#ifdef CONFIG_SWAP |
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if (!file) { |
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walk_page_range(vma->vm_mm, start, end, &swapin_walk_ops, vma); lru_add_drain(); /* Push any new pages onto the LRU now */ |
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return 0; } |
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|
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if (shmem_mapping(file->f_mapping)) { |
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force_shm_swapin_readahead(vma, start, end, file->f_mapping); return 0; } #else |
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if (!file) return -EBADF; |
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#endif |
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|
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if (IS_DAX(file_inode(file))) { |
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/* no bad return value, but ignore advice */ return 0; } |
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/* * Filesystem's fadvise may need to take various locks. We need to * explicitly grab a reference because the vma (and hence the * vma's reference to the file) can go away as soon as we drop * mmap_sem. */ *prev = NULL; /* tell sys_madvise we drop mmap_sem */ get_file(file); |
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offset = (loff_t)(start - vma->vm_start) + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
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up_read(¤t->mm->mmap_sem); |
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vfs_fadvise(file, offset, end - start, POSIX_FADV_WILLNEED); fput(file); down_read(¤t->mm->mmap_sem); |
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return 0; } |
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static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) |
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{ |
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struct madvise_walk_private *private = walk->private; struct mmu_gather *tlb = private->tlb; bool pageout = private->pageout; |
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struct mm_struct *mm = tlb->mm; struct vm_area_struct *vma = walk->vma; pte_t *orig_pte, *pte, ptent; spinlock_t *ptl; |
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struct page *page = NULL; LIST_HEAD(page_list); if (fatal_signal_pending(current)) return -EINTR; |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE if (pmd_trans_huge(*pmd)) { pmd_t orig_pmd; unsigned long next = pmd_addr_end(addr, end); tlb_change_page_size(tlb, HPAGE_PMD_SIZE); ptl = pmd_trans_huge_lock(pmd, vma); if (!ptl) return 0; orig_pmd = *pmd; if (is_huge_zero_pmd(orig_pmd)) goto huge_unlock; if (unlikely(!pmd_present(orig_pmd))) { VM_BUG_ON(thp_migration_supported() && !is_pmd_migration_entry(orig_pmd)); goto huge_unlock; } page = pmd_page(orig_pmd); |
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/* Do not interfere with other mappings of this page */ if (page_mapcount(page) != 1) goto huge_unlock; |
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if (next - addr != HPAGE_PMD_SIZE) { int err; |
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get_page(page); spin_unlock(ptl); lock_page(page); err = split_huge_page(page); unlock_page(page); put_page(page); if (!err) goto regular_page; return 0; } if (pmd_young(orig_pmd)) { pmdp_invalidate(vma, addr, pmd); orig_pmd = pmd_mkold(orig_pmd); set_pmd_at(mm, addr, pmd, orig_pmd); tlb_remove_pmd_tlb_entry(tlb, pmd, addr); } |
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ClearPageReferenced(page); |
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test_and_clear_page_young(page); |
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if (pageout) { |
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if (!isolate_lru_page(page)) { if (PageUnevictable(page)) putback_lru_page(page); else list_add(&page->lru, &page_list); } |
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} else deactivate_page(page); |
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huge_unlock: spin_unlock(ptl); |
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if (pageout) reclaim_pages(&page_list); |
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return 0; } |
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regular_page: |
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if (pmd_trans_unstable(pmd)) return 0; |
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#endif tlb_change_page_size(tlb, PAGE_SIZE); orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); flush_tlb_batched_pending(mm); arch_enter_lazy_mmu_mode(); for (; addr < end; pte++, addr += PAGE_SIZE) { ptent = *pte; if (pte_none(ptent)) continue; if (!pte_present(ptent)) continue; page = vm_normal_page(vma, addr, ptent); if (!page) continue; /* * Creating a THP page is expensive so split it only if we * are sure it's worth. Split it if we are only owner. */ if (PageTransCompound(page)) { if (page_mapcount(page) != 1) break; get_page(page); if (!trylock_page(page)) { put_page(page); break; } pte_unmap_unlock(orig_pte, ptl); if (split_huge_page(page)) { unlock_page(page); put_page(page); pte_offset_map_lock(mm, pmd, addr, &ptl); break; } unlock_page(page); put_page(page); pte = pte_offset_map_lock(mm, pmd, addr, &ptl); pte--; addr -= PAGE_SIZE; continue; } |
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/* Do not interfere with other mappings of this page */ if (page_mapcount(page) != 1) continue; |
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VM_BUG_ON_PAGE(PageTransCompound(page), page); if (pte_young(ptent)) { ptent = ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); ptent = pte_mkold(ptent); set_pte_at(mm, addr, pte, ptent); tlb_remove_tlb_entry(tlb, pte, addr); } /* * We are deactivating a page for accelerating reclaiming. * VM couldn't reclaim the page unless we clear PG_young. * As a side effect, it makes confuse idle-page tracking * because they will miss recent referenced history. */ |
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ClearPageReferenced(page); |
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test_and_clear_page_young(page); |
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if (pageout) { |
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if (!isolate_lru_page(page)) { if (PageUnevictable(page)) putback_lru_page(page); else list_add(&page->lru, &page_list); } |
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} else deactivate_page(page); |
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} arch_leave_lazy_mmu_mode(); pte_unmap_unlock(orig_pte, ptl); |
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if (pageout) reclaim_pages(&page_list); |
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cond_resched(); return 0; } static const struct mm_walk_ops cold_walk_ops = { |
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.pmd_entry = madvise_cold_or_pageout_pte_range, |
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}; static void madvise_cold_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { |
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struct madvise_walk_private walk_private = { .pageout = false, .tlb = tlb, }; |
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tlb_start_vma(tlb, vma); |
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walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private); |
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tlb_end_vma(tlb, vma); } static long madvise_cold(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start_addr, unsigned long end_addr) { struct mm_struct *mm = vma->vm_mm; struct mmu_gather tlb; *prev = vma; if (!can_madv_lru_vma(vma)) return -EINVAL; lru_add_drain(); tlb_gather_mmu(&tlb, mm, start_addr, end_addr); madvise_cold_page_range(&tlb, vma, start_addr, end_addr); tlb_finish_mmu(&tlb, start_addr, end_addr); return 0; } |
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static void madvise_pageout_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { |
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struct madvise_walk_private walk_private = { .pageout = true, .tlb = tlb, }; |
1a4e58cce mm: introduce MAD... |
499 |
tlb_start_vma(tlb, vma); |
d616d5126 mm: factor out co... |
500 |
walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private); |
1a4e58cce mm: introduce MAD... |
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
tlb_end_vma(tlb, vma); } static inline bool can_do_pageout(struct vm_area_struct *vma) { if (vma_is_anonymous(vma)) return true; if (!vma->vm_file) return false; /* * paging out pagecache only for non-anonymous mappings that correspond * to the files the calling process could (if tried) open for writing; * otherwise we'd be including shared non-exclusive mappings, which * opens a side channel. */ return inode_owner_or_capable(file_inode(vma->vm_file)) || inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0; } static long madvise_pageout(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start_addr, unsigned long end_addr) { struct mm_struct *mm = vma->vm_mm; struct mmu_gather tlb; *prev = vma; if (!can_madv_lru_vma(vma)) return -EINVAL; if (!can_do_pageout(vma)) return 0; lru_add_drain(); tlb_gather_mmu(&tlb, mm, start_addr, end_addr); madvise_pageout_page_range(&tlb, vma, start_addr, end_addr); tlb_finish_mmu(&tlb, start_addr, end_addr); return 0; } |
854e9ed09 mm: support madvi... |
541 542 543 544 545 546 547 548 549 550 |
static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { struct mmu_gather *tlb = walk->private; struct mm_struct *mm = tlb->mm; struct vm_area_struct *vma = walk->vma; spinlock_t *ptl; pte_t *orig_pte, *pte, ptent; struct page *page; |
64b42bc1c mm/madvise.c: fre... |
551 |
int nr_swap = 0; |
b8d3c4c30 mm/huge_memory.c:... |
552 553 554 555 556 557 |
unsigned long next; next = pmd_addr_end(addr, end); if (pmd_trans_huge(*pmd)) if (madvise_free_huge_pmd(tlb, vma, pmd, addr, next)) goto next; |
854e9ed09 mm: support madvi... |
558 |
|
854e9ed09 mm: support madvi... |
559 560 |
if (pmd_trans_unstable(pmd)) return 0; |
ed6a79352 asm-generic/tlb, ... |
561 |
tlb_change_page_size(tlb, PAGE_SIZE); |
854e9ed09 mm: support madvi... |
562 |
orig_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl); |
3ea277194 mm, mprotect: flu... |
563 |
flush_tlb_batched_pending(mm); |
854e9ed09 mm: support madvi... |
564 565 566 |
arch_enter_lazy_mmu_mode(); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; |
64b42bc1c mm/madvise.c: fre... |
567 |
if (pte_none(ptent)) |
854e9ed09 mm: support madvi... |
568 |
continue; |
64b42bc1c mm/madvise.c: fre... |
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 |
/* * If the pte has swp_entry, just clear page table to * prevent swap-in which is more expensive rather than * (page allocation + zeroing). */ if (!pte_present(ptent)) { swp_entry_t entry; entry = pte_to_swp_entry(ptent); if (non_swap_entry(entry)) continue; nr_swap--; free_swap_and_cache(entry); pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); continue; } |
854e9ed09 mm: support madvi... |
585 |
|
25b2995a3 mm: remove MEMORY... |
586 |
page = vm_normal_page(vma, addr, ptent); |
854e9ed09 mm: support madvi... |
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 |
if (!page) continue; /* * If pmd isn't transhuge but the page is THP and * is owned by only this process, split it and * deactivate all pages. */ if (PageTransCompound(page)) { if (page_mapcount(page) != 1) goto out; get_page(page); if (!trylock_page(page)) { put_page(page); goto out; } pte_unmap_unlock(orig_pte, ptl); if (split_huge_page(page)) { unlock_page(page); put_page(page); pte_offset_map_lock(mm, pmd, addr, &ptl); goto out; } |
854e9ed09 mm: support madvi... |
610 |
unlock_page(page); |
263630e8d mm/madvise.c: fix... |
611 |
put_page(page); |
854e9ed09 mm: support madvi... |
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
pte = pte_offset_map_lock(mm, pmd, addr, &ptl); pte--; addr -= PAGE_SIZE; continue; } VM_BUG_ON_PAGE(PageTransCompound(page), page); if (PageSwapCache(page) || PageDirty(page)) { if (!trylock_page(page)) continue; /* * If page is shared with others, we couldn't clear * PG_dirty of the page. */ if (page_mapcount(page) != 1) { unlock_page(page); continue; } if (PageSwapCache(page) && !try_to_free_swap(page)) { unlock_page(page); continue; } ClearPageDirty(page); unlock_page(page); } if (pte_young(ptent) || pte_dirty(ptent)) { /* * Some of architecture(ex, PPC) don't update TLB * with set_pte_at and tlb_remove_tlb_entry so for * the portability, remap the pte with old|clean * after pte clearing. */ ptent = ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); ptent = pte_mkold(ptent); ptent = pte_mkclean(ptent); set_pte_at(mm, addr, pte, ptent); tlb_remove_tlb_entry(tlb, pte, addr); } |
802a3a92a mm: reclaim MADV_... |
656 |
mark_page_lazyfree(page); |
854e9ed09 mm: support madvi... |
657 658 |
} out: |
64b42bc1c mm/madvise.c: fre... |
659 660 661 662 663 664 |
if (nr_swap) { if (current->mm == mm) sync_mm_rss(mm); add_mm_counter(mm, MM_SWAPENTS, nr_swap); } |
854e9ed09 mm: support madvi... |
665 666 667 |
arch_leave_lazy_mmu_mode(); pte_unmap_unlock(orig_pte, ptl); cond_resched(); |
b8d3c4c30 mm/huge_memory.c:... |
668 |
next: |
854e9ed09 mm: support madvi... |
669 670 |
return 0; } |
7b86ac337 pagewalk: separat... |
671 672 673 |
static const struct mm_walk_ops madvise_free_walk_ops = { .pmd_entry = madvise_free_pte_range, }; |
854e9ed09 mm: support madvi... |
674 675 676 677 |
static int madvise_free_single_vma(struct vm_area_struct *vma, unsigned long start_addr, unsigned long end_addr) { |
854e9ed09 mm: support madvi... |
678 |
struct mm_struct *mm = vma->vm_mm; |
ac46d4f3c mm/mmu_notifier: ... |
679 |
struct mmu_notifier_range range; |
854e9ed09 mm: support madvi... |
680 |
struct mmu_gather tlb; |
854e9ed09 mm: support madvi... |
681 682 683 |
/* MADV_FREE works for only anon vma at the moment */ if (!vma_is_anonymous(vma)) return -EINVAL; |
ac46d4f3c mm/mmu_notifier: ... |
684 685 |
range.start = max(vma->vm_start, start_addr); if (range.start >= vma->vm_end) |
854e9ed09 mm: support madvi... |
686 |
return -EINVAL; |
ac46d4f3c mm/mmu_notifier: ... |
687 688 |
range.end = min(vma->vm_end, end_addr); if (range.end <= vma->vm_start) |
854e9ed09 mm: support madvi... |
689 |
return -EINVAL; |
7269f9999 mm/mmu_notifier: ... |
690 |
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, |
6f4f13e8d mm/mmu_notifier: ... |
691 |
range.start, range.end); |
854e9ed09 mm: support madvi... |
692 693 |
lru_add_drain(); |
ac46d4f3c mm/mmu_notifier: ... |
694 |
tlb_gather_mmu(&tlb, mm, range.start, range.end); |
854e9ed09 mm: support madvi... |
695 |
update_hiwater_rss(mm); |
ac46d4f3c mm/mmu_notifier: ... |
696 |
mmu_notifier_invalidate_range_start(&range); |
7b86ac337 pagewalk: separat... |
697 698 699 700 |
tlb_start_vma(&tlb, vma); walk_page_range(vma->vm_mm, range.start, range.end, &madvise_free_walk_ops, &tlb); tlb_end_vma(&tlb, vma); |
ac46d4f3c mm/mmu_notifier: ... |
701 702 |
mmu_notifier_invalidate_range_end(&range); tlb_finish_mmu(&tlb, range.start, range.end); |
854e9ed09 mm: support madvi... |
703 704 705 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 709 |
/* * Application no longer needs these pages. If the pages are dirty, * it's OK to just throw them away. The app will be more careful about * data it wants to keep. Be sure to free swap resources too. The |
7e6cbea39 madvise: update f... |
710 |
* zap_page_range call sets things up for shrink_active_list to actually free |
1da177e4c Linux-2.6.12-rc2 |
711 712 |
* these pages later if no one else has touched them in the meantime, * although we could add these pages to a global reuse list for |
7e6cbea39 madvise: update f... |
713 |
* shrink_active_list to pick up before reclaiming other pages. |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 719 720 721 722 723 724 |
* * NB: This interface discards data rather than pushes it out to swap, * as some implementations do. This has performance implications for * applications like large transactional databases which want to discard * pages in anonymous maps after committing to backing store the data * that was kept in them. There is no reason to write this data out to * the swap area if the application is discarding it. * * An interface that causes the system to free clean pages and flush * dirty pages is already available as msync(MS_INVALIDATE). */ |
230ca982b userfaultfd: non-... |
725 726 727 728 729 730 731 732 733 734 735 |
static long madvise_dontneed_single_vma(struct vm_area_struct *vma, unsigned long start, unsigned long end) { zap_page_range(vma, start, end - start); return 0; } static long madvise_dontneed_free(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start, unsigned long end, int behavior) |
1da177e4c Linux-2.6.12-rc2 |
736 |
{ |
05b743847 [PATCH] madvise: ... |
737 |
*prev = vma; |
9c276cc65 mm: introduce MAD... |
738 |
if (!can_madv_lru_vma(vma)) |
1da177e4c Linux-2.6.12-rc2 |
739 |
return -EINVAL; |
70ccb92fd userfaultfd: non-... |
740 741 742 743 744 745 746 747 748 749 750 751 752 753 |
if (!userfaultfd_remove(vma, start, end)) { *prev = NULL; /* mmap_sem has been dropped, prev is stale */ down_read(¤t->mm->mmap_sem); vma = find_vma(current->mm, start); if (!vma) return -ENOMEM; if (start < vma->vm_start) { /* * This "vma" under revalidation is the one * with the lowest vma->vm_start where start * is also < vma->vm_end. If start < * vma->vm_start it means an hole materialized * in the user address space within the |
230ca982b userfaultfd: non-... |
754 755 |
* virtual range passed to MADV_DONTNEED * or MADV_FREE. |
70ccb92fd userfaultfd: non-... |
756 757 758 |
*/ return -ENOMEM; } |
9c276cc65 mm: introduce MAD... |
759 |
if (!can_madv_lru_vma(vma)) |
70ccb92fd userfaultfd: non-... |
760 761 762 763 764 765 |
return -EINVAL; if (end > vma->vm_end) { /* * Don't fail if end > vma->vm_end. If the old * vma was splitted while the mmap_sem was * released the effect of the concurrent |
230ca982b userfaultfd: non-... |
766 |
* operation may not cause madvise() to |
70ccb92fd userfaultfd: non-... |
767 768 769 770 771 772 773 774 775 776 777 |
* have an undefined result. There may be an * adjacent next vma that we'll walk * next. userfaultfd_remove() will generate an * UFFD_EVENT_REMOVE repetition on the * end-vma->vm_end range, but the manager can * handle a repetition fine. */ end = vma->vm_end; } VM_WARN_ON(start >= end); } |
230ca982b userfaultfd: non-... |
778 779 780 781 782 783 784 |
if (behavior == MADV_DONTNEED) return madvise_dontneed_single_vma(vma, start, end); else if (behavior == MADV_FREE) return madvise_free_single_vma(vma, start, end); else return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
785 |
} |
f6b3ec238 [PATCH] madvise(M... |
786 787 788 |
/* * Application wants to free up the pages and associated backing store. * This is effectively punching a hole into the middle of a file. |
f6b3ec238 [PATCH] madvise(M... |
789 790 |
*/ static long madvise_remove(struct vm_area_struct *vma, |
00e9fa2d6 [PATCH] mm: fix m... |
791 |
struct vm_area_struct **prev, |
f6b3ec238 [PATCH] madvise(M... |
792 793 |
unsigned long start, unsigned long end) { |
3f31d0757 mm/fs: route MADV... |
794 |
loff_t offset; |
90ed52ebe [PATCH] holepunch... |
795 |
int error; |
9ab4233dd mm: Hold a file r... |
796 |
struct file *f; |
f6b3ec238 [PATCH] madvise(M... |
797 |
|
90ed52ebe [PATCH] holepunch... |
798 |
*prev = NULL; /* tell sys_madvise we drop mmap_sem */ |
00e9fa2d6 [PATCH] mm: fix m... |
799 |
|
72079ba0d mm: madvise allow... |
800 |
if (vma->vm_flags & VM_LOCKED) |
f6b3ec238 [PATCH] madvise(M... |
801 |
return -EINVAL; |
9ab4233dd mm: Hold a file r... |
802 803 804 |
f = vma->vm_file; if (!f || !f->f_mapping || !f->f_mapping->host) { |
f6b3ec238 [PATCH] madvise(M... |
805 806 |
return -EINVAL; } |
69cf0fac6 [PATCH] Fix MADV_... |
807 808 |
if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE)) return -EACCES; |
f6b3ec238 [PATCH] madvise(M... |
809 810 |
offset = (loff_t)(start - vma->vm_start) + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
90ed52ebe [PATCH] holepunch... |
811 |
|
9ab4233dd mm: Hold a file r... |
812 813 814 815 816 817 818 |
/* * Filesystem's fallocate may need to take i_mutex. We need to * explicitly grab a reference because the vma (and hence the * vma's reference to the file) can go away as soon as we drop * mmap_sem. */ get_file(f); |
70ccb92fd userfaultfd: non-... |
819 820 821 822 |
if (userfaultfd_remove(vma, start, end)) { /* mmap_sem was not released by userfaultfd_remove() */ up_read(¤t->mm->mmap_sem); } |
72c72bdf7 VFS: Rename do_fa... |
823 |
error = vfs_fallocate(f, |
3f31d0757 mm/fs: route MADV... |
824 825 |
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, offset, end - start); |
9ab4233dd mm: Hold a file r... |
826 |
fput(f); |
0a27a14a6 mm: madvise avoid... |
827 |
down_read(¤t->mm->mmap_sem); |
90ed52ebe [PATCH] holepunch... |
828 |
return error; |
f6b3ec238 [PATCH] madvise(M... |
829 |
} |
9893e49d6 HWPOISON: Add mad... |
830 831 832 833 |
#ifdef CONFIG_MEMORY_FAILURE /* * Error injection support for memory error handling. */ |
97167a768 mm/madvise.c: cle... |
834 835 |
static int madvise_inject_error(int behavior, unsigned long start, unsigned long end) |
9893e49d6 HWPOISON: Add mad... |
836 |
{ |
97167a768 mm/madvise.c: cle... |
837 |
struct page *page; |
c461ad6a6 mm, madvise: ensu... |
838 |
struct zone *zone; |
19bfbe22f mm, hugetlb, soft... |
839 |
unsigned int order; |
97167a768 mm/madvise.c: cle... |
840 |
|
9893e49d6 HWPOISON: Add mad... |
841 842 |
if (!capable(CAP_SYS_ADMIN)) return -EPERM; |
97167a768 mm/madvise.c: cle... |
843 |
|
19bfbe22f mm, hugetlb, soft... |
844 845 |
for (; start < end; start += PAGE_SIZE << order) { |
23e7b5c2e mm, madvise_injec... |
846 |
unsigned long pfn; |
325c4ef5c mm/madvise.c:madv... |
847 |
int ret; |
97167a768 mm/madvise.c: cle... |
848 |
ret = get_user_pages_fast(start, 1, 0, &page); |
9893e49d6 HWPOISON: Add mad... |
849 850 |
if (ret != 1) return ret; |
23e7b5c2e mm, madvise_injec... |
851 |
pfn = page_to_pfn(page); |
325c4ef5c mm/madvise.c:madv... |
852 |
|
19bfbe22f mm, hugetlb, soft... |
853 854 855 856 857 858 |
/* * When soft offlining hugepages, after migrating the page * we dissolve it, therefore in the second loop "page" will * no longer be a compound page, and order will be 0. */ order = compound_order(compound_head(page)); |
97167a768 mm/madvise.c: cle... |
859 860 |
if (PageHWPoison(page)) { put_page(page); |
29b4eedee mm/hwpoison.c: fi... |
861 862 |
continue; } |
97167a768 mm/madvise.c: cle... |
863 864 865 866 |
if (behavior == MADV_SOFT_OFFLINE) { pr_info("Soft offlining pfn %#lx at process virtual address %#lx ", |
23e7b5c2e mm, madvise_injec... |
867 |
pfn, start); |
97167a768 mm/madvise.c: cle... |
868 869 |
ret = soft_offline_page(page, MF_COUNT_INCREASED); |
afcf938ee HWPOISON: Add a m... |
870 |
if (ret) |
8302423b8 mm/madvise.c: fix... |
871 |
return ret; |
afcf938ee HWPOISON: Add a m... |
872 873 |
continue; } |
23e7b5c2e mm, madvise_injec... |
874 |
|
97167a768 mm/madvise.c: cle... |
875 876 |
pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx ", |
23e7b5c2e mm, madvise_injec... |
877 |
pfn, start); |
97167a768 mm/madvise.c: cle... |
878 |
|
23e7b5c2e mm, madvise_injec... |
879 880 881 882 883 884 885 886 |
/* * Drop the page reference taken by get_user_pages_fast(). In * the absence of MF_COUNT_INCREASED the memory_failure() * routine is responsible for pinning the page to prevent it * from being released back to the page allocator. */ put_page(page); ret = memory_failure(pfn, 0); |
23a003bfd mm/madvise: pass ... |
887 888 |
if (ret) return ret; |
9893e49d6 HWPOISON: Add mad... |
889 |
} |
c461ad6a6 mm, madvise: ensu... |
890 891 892 893 |
/* Ensure that all poisoned pages are removed from per-cpu lists */ for_each_populated_zone(zone) drain_all_pages(zone); |
325c4ef5c mm/madvise.c:madv... |
894 |
return 0; |
9893e49d6 HWPOISON: Add mad... |
895 896 |
} #endif |
165cd4023 [PATCH] madvise()... |
897 898 899 |
static long madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start, unsigned long end, int behavior) |
1da177e4c Linux-2.6.12-rc2 |
900 |
{ |
1da177e4c Linux-2.6.12-rc2 |
901 |
switch (behavior) { |
f6b3ec238 [PATCH] madvise(M... |
902 |
case MADV_REMOVE: |
3866ea90d ksm: first tidy u... |
903 |
return madvise_remove(vma, prev, start, end); |
1da177e4c Linux-2.6.12-rc2 |
904 |
case MADV_WILLNEED: |
3866ea90d ksm: first tidy u... |
905 |
return madvise_willneed(vma, prev, start, end); |
9c276cc65 mm: introduce MAD... |
906 907 |
case MADV_COLD: return madvise_cold(vma, prev, start, end); |
1a4e58cce mm: introduce MAD... |
908 909 |
case MADV_PAGEOUT: return madvise_pageout(vma, prev, start, end); |
854e9ed09 mm: support madvi... |
910 |
case MADV_FREE: |
1da177e4c Linux-2.6.12-rc2 |
911 |
case MADV_DONTNEED: |
230ca982b userfaultfd: non-... |
912 |
return madvise_dontneed_free(vma, prev, start, end, behavior); |
1da177e4c Linux-2.6.12-rc2 |
913 |
default: |
3866ea90d ksm: first tidy u... |
914 |
return madvise_behavior(vma, prev, start, end, behavior); |
1da177e4c Linux-2.6.12-rc2 |
915 |
} |
1da177e4c Linux-2.6.12-rc2 |
916 |
} |
1ecef9ed0 mm/madvise.c: mak... |
917 |
static bool |
75927af8b mm: madvise(): co... |
918 919 920 921 922 923 924 925 926 927 928 |
madvise_behavior_valid(int behavior) { switch (behavior) { case MADV_DOFORK: case MADV_DONTFORK: case MADV_NORMAL: case MADV_SEQUENTIAL: case MADV_RANDOM: case MADV_REMOVE: case MADV_WILLNEED: case MADV_DONTNEED: |
854e9ed09 mm: support madvi... |
929 |
case MADV_FREE: |
9c276cc65 mm: introduce MAD... |
930 |
case MADV_COLD: |
1a4e58cce mm: introduce MAD... |
931 |
case MADV_PAGEOUT: |
f8af4da3b ksm: the mm inter... |
932 933 934 935 |
#ifdef CONFIG_KSM case MADV_MERGEABLE: case MADV_UNMERGEABLE: #endif |
0af4e98b6 thp: madvise(MADV... |
936 937 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE case MADV_HUGEPAGE: |
a664b2d85 thp: madvise(MADV... |
938 |
case MADV_NOHUGEPAGE: |
0af4e98b6 thp: madvise(MADV... |
939 |
#endif |
accb61fe7 coredump: add VM_... |
940 941 |
case MADV_DONTDUMP: case MADV_DODUMP: |
d2cd9ede6 mm,fork: introduc... |
942 943 |
case MADV_WIPEONFORK: case MADV_KEEPONFORK: |
5e451be75 mm/madvise: move ... |
944 945 946 947 |
#ifdef CONFIG_MEMORY_FAILURE case MADV_SOFT_OFFLINE: case MADV_HWPOISON: #endif |
1ecef9ed0 mm/madvise.c: mak... |
948 |
return true; |
75927af8b mm: madvise(): co... |
949 950 |
default: |
1ecef9ed0 mm/madvise.c: mak... |
951 |
return false; |
75927af8b mm: madvise(): co... |
952 953 |
} } |
3866ea90d ksm: first tidy u... |
954 |
|
1da177e4c Linux-2.6.12-rc2 |
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 |
/* * The madvise(2) system call. * * Applications can use madvise() to advise the kernel how it should * handle paging I/O in this VM area. The idea is to help the kernel * use appropriate read-ahead and caching techniques. The information * provided is advisory only, and can be safely disregarded by the * kernel without affecting the correct operation of the application. * * behavior values: * MADV_NORMAL - the default behavior is to read clusters. This * results in some read-ahead and read-behind. * MADV_RANDOM - the system should read the minimum amount of data * on any access, since it is unlikely that the appli- * cation will need more than what it asks for. * MADV_SEQUENTIAL - pages in the given range will probably be accessed * once, so they can be aggressively read ahead, and * can be freed soon after they are accessed. * MADV_WILLNEED - the application is notifying the system to read * some pages ahead. * MADV_DONTNEED - the application is finished with the given range, * so the kernel can free resources associated with it. |
d7206a70a mm/madvise: updat... |
977 978 |
* MADV_FREE - the application marks pages in the given range as lazy free, * where actual purges are postponed until memory pressure happens. |
f6b3ec238 [PATCH] madvise(M... |
979 980 |
* MADV_REMOVE - the application wants to free up the given range of * pages and associated backing store. |
3866ea90d ksm: first tidy u... |
981 982 983 |
* MADV_DONTFORK - omit this area from child's address space when forking: * typically, to avoid COWing pages pinned by get_user_pages(). * MADV_DOFORK - cancel MADV_DONTFORK: no longer omit this area when forking. |
c02c30093 mm/madvise.c: add... |
984 985 986 |
* MADV_WIPEONFORK - present the child process with zero-filled memory in this * range after a fork. * MADV_KEEPONFORK - undo the effect of MADV_WIPEONFORK |
d7206a70a mm/madvise: updat... |
987 988 989 |
* MADV_HWPOISON - trigger memory error handler as if the given memory range * were corrupted by unrecoverable hardware memory failure. * MADV_SOFT_OFFLINE - try to soft-offline the given range of memory. |
f8af4da3b ksm: the mm inter... |
990 991 992 |
* MADV_MERGEABLE - the application recommends that KSM try to merge pages in * this area with pages of identical content from other such areas. * MADV_UNMERGEABLE- cancel MADV_MERGEABLE: no longer merge pages with others. |
d7206a70a mm/madvise: updat... |
993 994 995 996 997 998 999 1000 1001 |
* MADV_HUGEPAGE - the application wants to back the given range by transparent * huge pages in the future. Existing pages might be coalesced and * new pages might be allocated as THP. * MADV_NOHUGEPAGE - mark the given range as not worth being backed by * transparent huge pages so the existing pages will not be * coalesced into THP and new pages will not be allocated as THP. * MADV_DONTDUMP - the application wants to prevent pages in the given range * from being included in its core dump. * MADV_DODUMP - cancel MADV_DONTDUMP: no longer exclude from core dump. |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 1005 1006 |
* * return values: * zero - success * -EINVAL - start + len < 0, start is not page-aligned, * "behavior" is not a valid value, or application |
c02c30093 mm/madvise.c: add... |
1007 1008 1009 |
* is attempting to release locked or shared pages, * or the specified address range includes file, Huge TLB, * MAP_SHARED or VMPFNMAP range. |
1da177e4c Linux-2.6.12-rc2 |
1010 1011 1012 1013 1014 1015 |
* -ENOMEM - addresses in the specified range are not currently * mapped, or are outside the AS of the process. * -EIO - an I/O error occurred while paging in data. * -EBADF - map exists, but area maps something that isn't a file. * -EAGAIN - a kernel resource was temporarily unavailable. */ |
3480b2574 [CVE-2009-0029] S... |
1016 |
SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) |
1da177e4c Linux-2.6.12-rc2 |
1017 |
{ |
05b743847 [PATCH] madvise: ... |
1018 |
unsigned long end, tmp; |
ec9bed9d3 mm/madvise.c: fix... |
1019 |
struct vm_area_struct *vma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 |
int unmapped_error = 0; int error = -EINVAL; |
f79777932 speed up madvise_... |
1022 |
int write; |
1da177e4c Linux-2.6.12-rc2 |
1023 |
size_t len; |
1998cc048 mm: make madvise(... |
1024 |
struct blk_plug plug; |
1da177e4c Linux-2.6.12-rc2 |
1025 |
|
057d33891 mm: untag user po... |
1026 |
start = untagged_addr(start); |
75927af8b mm: madvise(): co... |
1027 1028 |
if (!madvise_behavior_valid(behavior)) return error; |
1da177e4c Linux-2.6.12-rc2 |
1029 |
if (start & ~PAGE_MASK) |
84d96d897 mm: madvise: comp... |
1030 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 1034 |
len = (len_in + ~PAGE_MASK) & PAGE_MASK; /* Check to see whether len was rounded up from small -ve to zero */ if (len_in && !len) |
84d96d897 mm: madvise: comp... |
1035 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 |
end = start + len; if (end < start) |
84d96d897 mm: madvise: comp... |
1039 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 |
error = 0; if (end == start) |
84d96d897 mm: madvise: comp... |
1043 |
return error; |
5e451be75 mm/madvise: move ... |
1044 1045 1046 1047 |
#ifdef CONFIG_MEMORY_FAILURE if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE) return madvise_inject_error(behavior, start, start + len_in); #endif |
84d96d897 mm: madvise: comp... |
1048 |
write = madvise_need_mmap_write(behavior); |
dc0ef0df7 mm: make mmap_sem... |
1049 1050 1051 1052 |
if (write) { if (down_write_killable(¤t->mm->mmap_sem)) return -EINTR; } else { |
84d96d897 mm: madvise: comp... |
1053 |
down_read(¤t->mm->mmap_sem); |
dc0ef0df7 mm: make mmap_sem... |
1054 |
} |
1da177e4c Linux-2.6.12-rc2 |
1055 1056 1057 1058 |
/* * If the interval [start,end) covers some unmapped address * ranges, just ignore them, but return -ENOMEM at the end. |
05b743847 [PATCH] madvise: ... |
1059 |
* - different from the way of handling in mlock etc. |
1da177e4c Linux-2.6.12-rc2 |
1060 |
*/ |
05b743847 [PATCH] madvise: ... |
1061 |
vma = find_vma_prev(current->mm, start, &prev); |
836d5ffd3 [PATCH] mm: fix m... |
1062 1063 |
if (vma && start > vma->vm_start) prev = vma; |
1998cc048 mm: make madvise(... |
1064 |
blk_start_plug(&plug); |
1da177e4c Linux-2.6.12-rc2 |
1065 1066 1067 1068 |
for (;;) { /* Still start < end. */ error = -ENOMEM; if (!vma) |
84d96d897 mm: madvise: comp... |
1069 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1070 |
|
05b743847 [PATCH] madvise: ... |
1071 |
/* Here start < (end|vma->vm_end). */ |
1da177e4c Linux-2.6.12-rc2 |
1072 1073 1074 |
if (start < vma->vm_start) { unmapped_error = -ENOMEM; start = vma->vm_start; |
05b743847 [PATCH] madvise: ... |
1075 |
if (start >= end) |
84d96d897 mm: madvise: comp... |
1076 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1077 |
} |
05b743847 [PATCH] madvise: ... |
1078 1079 1080 1081 |
/* Here vma->vm_start <= start < (end|vma->vm_end) */ tmp = vma->vm_end; if (end < tmp) tmp = end; |
1da177e4c Linux-2.6.12-rc2 |
1082 |
|
05b743847 [PATCH] madvise: ... |
1083 1084 |
/* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */ error = madvise_vma(vma, &prev, start, tmp, behavior); |
1da177e4c Linux-2.6.12-rc2 |
1085 |
if (error) |
84d96d897 mm: madvise: comp... |
1086 |
goto out; |
05b743847 [PATCH] madvise: ... |
1087 |
start = tmp; |
90ed52ebe [PATCH] holepunch... |
1088 |
if (prev && start < prev->vm_end) |
05b743847 [PATCH] madvise: ... |
1089 1090 1091 |
start = prev->vm_end; error = unmapped_error; if (start >= end) |
84d96d897 mm: madvise: comp... |
1092 |
goto out; |
90ed52ebe [PATCH] holepunch... |
1093 1094 1095 1096 |
if (prev) vma = prev->vm_next; else /* madvise_remove dropped mmap_sem */ vma = find_vma(current->mm, start); |
1da177e4c Linux-2.6.12-rc2 |
1097 |
} |
1da177e4c Linux-2.6.12-rc2 |
1098 |
out: |
84d96d897 mm: madvise: comp... |
1099 |
blk_finish_plug(&plug); |
f79777932 speed up madvise_... |
1100 |
if (write) |
0a27a14a6 mm: madvise avoid... |
1101 1102 1103 |
up_write(¤t->mm->mmap_sem); else up_read(¤t->mm->mmap_sem); |
1da177e4c Linux-2.6.12-rc2 |
1104 1105 |
return error; } |