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mm/madvise.c
30.6 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/sched/mm.h> #include <linux/uio.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 |
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* take mmap_lock for writing. Others, which simply traverse vmas, need |
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* 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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/* |
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* vm_flags is protected by the mmap_lock held in write mode. |
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*/ |
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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) { |
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XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start)); |
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pgoff_t end_index = linear_page_index(vma, end + PAGE_SIZE - 1); |
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struct page *page; |
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|
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rcu_read_lock(); xas_for_each(&xas, page, end_index) { swp_entry_t swap; |
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|
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if (!xa_is_value(page)) |
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continue; |
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xas_pause(&xas); rcu_read_unlock(); |
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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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rcu_read_lock(); |
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} |
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rcu_read_unlock(); |
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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) { |
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struct mm_struct *mm = vma->vm_mm; |
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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 |
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* mmap_lock. |
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*/ |
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*prev = NULL; /* tell sys_madvise we drop mmap_lock */ |
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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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mmap_read_unlock(mm); |
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vfs_fadvise(file, offset, end - start, POSIX_FADV_WILLNEED); fput(file); |
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mmap_read_lock(mm); |
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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, |
9c276cc65 mm: introduce MAD... |
464 465 466 467 468 469 |
}; static void madvise_cold_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { |
d616d5126 mm: factor out co... |
470 471 472 473 |
struct madvise_walk_private walk_private = { .pageout = false, .tlb = tlb, }; |
9c276cc65 mm: introduce MAD... |
474 |
tlb_start_vma(tlb, vma); |
d616d5126 mm: factor out co... |
475 |
walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private); |
9c276cc65 mm: introduce MAD... |
476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
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; } |
1a4e58cce mm: introduce MAD... |
497 498 499 500 |
static void madvise_pageout_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { |
d616d5126 mm: factor out co... |
501 502 503 504 |
struct madvise_walk_private walk_private = { .pageout = true, .tlb = tlb, }; |
1a4e58cce mm: introduce MAD... |
505 |
tlb_start_vma(tlb, vma); |
d616d5126 mm: factor out co... |
506 |
walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private); |
1a4e58cce mm: introduce MAD... |
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 |
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... |
547 548 549 550 551 552 553 554 555 556 |
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... |
557 |
int nr_swap = 0; |
b8d3c4c30 mm/huge_memory.c:... |
558 559 560 561 562 563 |
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... |
564 |
|
854e9ed09 mm: support madvi... |
565 566 |
if (pmd_trans_unstable(pmd)) return 0; |
ed6a79352 asm-generic/tlb, ... |
567 |
tlb_change_page_size(tlb, PAGE_SIZE); |
854e9ed09 mm: support madvi... |
568 |
orig_pte = pte = pte_offset_map_lock(mm, pmd, addr, &ptl); |
3ea277194 mm, mprotect: flu... |
569 |
flush_tlb_batched_pending(mm); |
854e9ed09 mm: support madvi... |
570 571 572 |
arch_enter_lazy_mmu_mode(); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; |
64b42bc1c mm/madvise.c: fre... |
573 |
if (pte_none(ptent)) |
854e9ed09 mm: support madvi... |
574 |
continue; |
64b42bc1c mm/madvise.c: fre... |
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 |
/* * 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... |
591 |
|
25b2995a3 mm: remove MEMORY... |
592 |
page = vm_normal_page(vma, addr, ptent); |
854e9ed09 mm: support madvi... |
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 |
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... |
616 |
unlock_page(page); |
263630e8d mm/madvise.c: fix... |
617 |
put_page(page); |
854e9ed09 mm: support madvi... |
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 |
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_... |
662 |
mark_page_lazyfree(page); |
854e9ed09 mm: support madvi... |
663 664 |
} out: |
64b42bc1c mm/madvise.c: fre... |
665 666 667 668 669 670 |
if (nr_swap) { if (current->mm == mm) sync_mm_rss(mm); add_mm_counter(mm, MM_SWAPENTS, nr_swap); } |
854e9ed09 mm: support madvi... |
671 672 673 |
arch_leave_lazy_mmu_mode(); pte_unmap_unlock(orig_pte, ptl); cond_resched(); |
b8d3c4c30 mm/huge_memory.c:... |
674 |
next: |
854e9ed09 mm: support madvi... |
675 676 |
return 0; } |
7b86ac337 pagewalk: separat... |
677 678 679 |
static const struct mm_walk_ops madvise_free_walk_ops = { .pmd_entry = madvise_free_pte_range, }; |
854e9ed09 mm: support madvi... |
680 681 682 683 |
static int madvise_free_single_vma(struct vm_area_struct *vma, unsigned long start_addr, unsigned long end_addr) { |
854e9ed09 mm: support madvi... |
684 |
struct mm_struct *mm = vma->vm_mm; |
ac46d4f3c mm/mmu_notifier: ... |
685 |
struct mmu_notifier_range range; |
854e9ed09 mm: support madvi... |
686 |
struct mmu_gather tlb; |
854e9ed09 mm: support madvi... |
687 688 689 |
/* MADV_FREE works for only anon vma at the moment */ if (!vma_is_anonymous(vma)) return -EINVAL; |
ac46d4f3c mm/mmu_notifier: ... |
690 691 |
range.start = max(vma->vm_start, start_addr); if (range.start >= vma->vm_end) |
854e9ed09 mm: support madvi... |
692 |
return -EINVAL; |
ac46d4f3c mm/mmu_notifier: ... |
693 694 |
range.end = min(vma->vm_end, end_addr); if (range.end <= vma->vm_start) |
854e9ed09 mm: support madvi... |
695 |
return -EINVAL; |
7269f9999 mm/mmu_notifier: ... |
696 |
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, |
6f4f13e8d mm/mmu_notifier: ... |
697 |
range.start, range.end); |
854e9ed09 mm: support madvi... |
698 699 |
lru_add_drain(); |
ac46d4f3c mm/mmu_notifier: ... |
700 |
tlb_gather_mmu(&tlb, mm, range.start, range.end); |
854e9ed09 mm: support madvi... |
701 |
update_hiwater_rss(mm); |
ac46d4f3c mm/mmu_notifier: ... |
702 |
mmu_notifier_invalidate_range_start(&range); |
7b86ac337 pagewalk: separat... |
703 704 705 706 |
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: ... |
707 708 |
mmu_notifier_invalidate_range_end(&range); tlb_finish_mmu(&tlb, range.start, range.end); |
854e9ed09 mm: support madvi... |
709 710 711 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
712 713 714 715 |
/* * 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... |
716 |
* zap_page_range call sets things up for shrink_active_list to actually free |
1da177e4c Linux-2.6.12-rc2 |
717 718 |
* 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... |
719 |
* shrink_active_list to pick up before reclaiming other pages. |
1da177e4c Linux-2.6.12-rc2 |
720 721 722 723 724 725 726 727 728 729 730 |
* * 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-... |
731 732 733 734 735 736 737 738 739 740 741 |
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 |
742 |
{ |
0726b01e7 mm/madvise: pass ... |
743 |
struct mm_struct *mm = vma->vm_mm; |
05b743847 [PATCH] madvise: ... |
744 |
*prev = vma; |
9c276cc65 mm: introduce MAD... |
745 |
if (!can_madv_lru_vma(vma)) |
1da177e4c Linux-2.6.12-rc2 |
746 |
return -EINVAL; |
70ccb92fd userfaultfd: non-... |
747 |
if (!userfaultfd_remove(vma, start, end)) { |
c1e8d7c6a mmap locking API:... |
748 |
*prev = NULL; /* mmap_lock has been dropped, prev is stale */ |
70ccb92fd userfaultfd: non-... |
749 |
|
0726b01e7 mm/madvise: pass ... |
750 751 |
mmap_read_lock(mm); vma = find_vma(mm, start); |
70ccb92fd userfaultfd: non-... |
752 753 754 755 756 757 758 759 760 |
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-... |
761 762 |
* virtual range passed to MADV_DONTNEED * or MADV_FREE. |
70ccb92fd userfaultfd: non-... |
763 764 765 |
*/ return -ENOMEM; } |
9c276cc65 mm: introduce MAD... |
766 |
if (!can_madv_lru_vma(vma)) |
70ccb92fd userfaultfd: non-... |
767 768 769 770 |
return -EINVAL; if (end > vma->vm_end) { /* * Don't fail if end > vma->vm_end. If the old |
c1e8d7c6a mmap locking API:... |
771 |
* vma was splitted while the mmap_lock was |
70ccb92fd userfaultfd: non-... |
772 |
* released the effect of the concurrent |
230ca982b userfaultfd: non-... |
773 |
* operation may not cause madvise() to |
70ccb92fd userfaultfd: non-... |
774 775 776 777 778 779 780 781 782 783 784 |
* 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-... |
785 786 787 788 789 790 791 |
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 |
792 |
} |
f6b3ec238 [PATCH] madvise(M... |
793 794 795 |
/* * 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... |
796 797 |
*/ static long madvise_remove(struct vm_area_struct *vma, |
00e9fa2d6 [PATCH] mm: fix m... |
798 |
struct vm_area_struct **prev, |
f6b3ec238 [PATCH] madvise(M... |
799 800 |
unsigned long start, unsigned long end) { |
3f31d0757 mm/fs: route MADV... |
801 |
loff_t offset; |
90ed52ebe [PATCH] holepunch... |
802 |
int error; |
9ab4233dd mm: Hold a file r... |
803 |
struct file *f; |
0726b01e7 mm/madvise: pass ... |
804 |
struct mm_struct *mm = vma->vm_mm; |
f6b3ec238 [PATCH] madvise(M... |
805 |
|
c1e8d7c6a mmap locking API:... |
806 |
*prev = NULL; /* tell sys_madvise we drop mmap_lock */ |
00e9fa2d6 [PATCH] mm: fix m... |
807 |
|
72079ba0d mm: madvise allow... |
808 |
if (vma->vm_flags & VM_LOCKED) |
f6b3ec238 [PATCH] madvise(M... |
809 |
return -EINVAL; |
9ab4233dd mm: Hold a file r... |
810 811 812 |
f = vma->vm_file; if (!f || !f->f_mapping || !f->f_mapping->host) { |
f6b3ec238 [PATCH] madvise(M... |
813 814 |
return -EINVAL; } |
69cf0fac6 [PATCH] Fix MADV_... |
815 816 |
if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE)) return -EACCES; |
f6b3ec238 [PATCH] madvise(M... |
817 818 |
offset = (loff_t)(start - vma->vm_start) + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); |
90ed52ebe [PATCH] holepunch... |
819 |
|
9ab4233dd mm: Hold a file r... |
820 821 822 823 |
/* * 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 |
c1e8d7c6a mmap locking API:... |
824 |
* mmap_lock. |
9ab4233dd mm: Hold a file r... |
825 826 |
*/ get_file(f); |
70ccb92fd userfaultfd: non-... |
827 |
if (userfaultfd_remove(vma, start, end)) { |
c1e8d7c6a mmap locking API:... |
828 |
/* mmap_lock was not released by userfaultfd_remove() */ |
0726b01e7 mm/madvise: pass ... |
829 |
mmap_read_unlock(mm); |
70ccb92fd userfaultfd: non-... |
830 |
} |
72c72bdf7 VFS: Rename do_fa... |
831 |
error = vfs_fallocate(f, |
3f31d0757 mm/fs: route MADV... |
832 833 |
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, offset, end - start); |
9ab4233dd mm: Hold a file r... |
834 |
fput(f); |
0726b01e7 mm/madvise: pass ... |
835 |
mmap_read_lock(mm); |
90ed52ebe [PATCH] holepunch... |
836 |
return error; |
f6b3ec238 [PATCH] madvise(M... |
837 |
} |
9893e49d6 HWPOISON: Add mad... |
838 839 840 841 |
#ifdef CONFIG_MEMORY_FAILURE /* * Error injection support for memory error handling. */ |
97167a768 mm/madvise.c: cle... |
842 843 |
static int madvise_inject_error(int behavior, unsigned long start, unsigned long end) |
9893e49d6 HWPOISON: Add mad... |
844 |
{ |
c461ad6a6 mm, madvise: ensu... |
845 |
struct zone *zone; |
d3cd257ce mm/madvise.c: rep... |
846 |
unsigned long size; |
97167a768 mm/madvise.c: cle... |
847 |
|
9893e49d6 HWPOISON: Add mad... |
848 849 |
if (!capable(CAP_SYS_ADMIN)) return -EPERM; |
97167a768 mm/madvise.c: cle... |
850 |
|
19bfbe22f mm, hugetlb, soft... |
851 |
|
d3cd257ce mm/madvise.c: rep... |
852 |
for (; start < end; start += size) { |
23e7b5c2e mm, madvise_injec... |
853 |
unsigned long pfn; |
dc7560b49 mm,hwpoison: refa... |
854 |
struct page *page; |
325c4ef5c mm/madvise.c:madv... |
855 |
int ret; |
97167a768 mm/madvise.c: cle... |
856 |
ret = get_user_pages_fast(start, 1, 0, &page); |
9893e49d6 HWPOISON: Add mad... |
857 858 |
if (ret != 1) return ret; |
23e7b5c2e mm, madvise_injec... |
859 |
pfn = page_to_pfn(page); |
325c4ef5c mm/madvise.c:madv... |
860 |
|
19bfbe22f mm, hugetlb, soft... |
861 862 863 |
/* * When soft offlining hugepages, after migrating the page * we dissolve it, therefore in the second loop "page" will |
d3cd257ce mm/madvise.c: rep... |
864 |
* no longer be a compound page. |
19bfbe22f mm, hugetlb, soft... |
865 |
*/ |
d3cd257ce mm/madvise.c: rep... |
866 |
size = page_size(compound_head(page)); |
19bfbe22f mm, hugetlb, soft... |
867 |
|
97167a768 mm/madvise.c: cle... |
868 869 870 |
if (behavior == MADV_SOFT_OFFLINE) { pr_info("Soft offlining pfn %#lx at process virtual address %#lx ", |
dc7560b49 mm,hwpoison: refa... |
871 |
pfn, start); |
feec24a61 mm, soft-offline:... |
872 |
ret = soft_offline_page(pfn, MF_COUNT_INCREASED); |
dc7560b49 mm,hwpoison: refa... |
873 874 875 876 |
} else { pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx ", pfn, start); |
b7bf8ed8d mm,memory_failure... |
877 |
ret = memory_failure(pfn, MF_COUNT_INCREASED); |
afcf938ee HWPOISON: Add a m... |
878 |
} |
23e7b5c2e mm, madvise_injec... |
879 |
|
23a003bfd mm/madvise: pass ... |
880 881 |
if (ret) return ret; |
9893e49d6 HWPOISON: Add mad... |
882 |
} |
c461ad6a6 mm, madvise: ensu... |
883 884 885 886 |
/* 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... |
887 |
return 0; |
9893e49d6 HWPOISON: Add mad... |
888 889 |
} #endif |
165cd4023 [PATCH] madvise()... |
890 891 892 |
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 |
893 |
{ |
1da177e4c Linux-2.6.12-rc2 |
894 |
switch (behavior) { |
f6b3ec238 [PATCH] madvise(M... |
895 |
case MADV_REMOVE: |
3866ea90d ksm: first tidy u... |
896 |
return madvise_remove(vma, prev, start, end); |
1da177e4c Linux-2.6.12-rc2 |
897 |
case MADV_WILLNEED: |
3866ea90d ksm: first tidy u... |
898 |
return madvise_willneed(vma, prev, start, end); |
9c276cc65 mm: introduce MAD... |
899 900 |
case MADV_COLD: return madvise_cold(vma, prev, start, end); |
1a4e58cce mm: introduce MAD... |
901 902 |
case MADV_PAGEOUT: return madvise_pageout(vma, prev, start, end); |
854e9ed09 mm: support madvi... |
903 |
case MADV_FREE: |
1da177e4c Linux-2.6.12-rc2 |
904 |
case MADV_DONTNEED: |
230ca982b userfaultfd: non-... |
905 |
return madvise_dontneed_free(vma, prev, start, end, behavior); |
1da177e4c Linux-2.6.12-rc2 |
906 |
default: |
3866ea90d ksm: first tidy u... |
907 |
return madvise_behavior(vma, prev, start, end, behavior); |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
1da177e4c Linux-2.6.12-rc2 |
909 |
} |
1ecef9ed0 mm/madvise.c: mak... |
910 |
static bool |
75927af8b mm: madvise(): co... |
911 912 913 914 915 916 917 918 919 920 921 |
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... |
922 |
case MADV_FREE: |
9c276cc65 mm: introduce MAD... |
923 |
case MADV_COLD: |
1a4e58cce mm: introduce MAD... |
924 |
case MADV_PAGEOUT: |
f8af4da3b ksm: the mm inter... |
925 926 927 928 |
#ifdef CONFIG_KSM case MADV_MERGEABLE: case MADV_UNMERGEABLE: #endif |
0af4e98b6 thp: madvise(MADV... |
929 930 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE case MADV_HUGEPAGE: |
a664b2d85 thp: madvise(MADV... |
931 |
case MADV_NOHUGEPAGE: |
0af4e98b6 thp: madvise(MADV... |
932 |
#endif |
accb61fe7 coredump: add VM_... |
933 934 |
case MADV_DONTDUMP: case MADV_DODUMP: |
d2cd9ede6 mm,fork: introduc... |
935 936 |
case MADV_WIPEONFORK: case MADV_KEEPONFORK: |
5e451be75 mm/madvise: move ... |
937 938 939 940 |
#ifdef CONFIG_MEMORY_FAILURE case MADV_SOFT_OFFLINE: case MADV_HWPOISON: #endif |
1ecef9ed0 mm/madvise.c: mak... |
941 |
return true; |
75927af8b mm: madvise(): co... |
942 943 |
default: |
1ecef9ed0 mm/madvise.c: mak... |
944 |
return false; |
75927af8b mm: madvise(): co... |
945 946 |
} } |
3866ea90d ksm: first tidy u... |
947 |
|
ecb8ac8b1 mm/madvise: intro... |
948 949 950 951 952 953 954 955 956 957 958 |
static bool process_madvise_behavior_valid(int behavior) { switch (behavior) { case MADV_COLD: case MADV_PAGEOUT: return true; default: return false; } } |
1da177e4c Linux-2.6.12-rc2 |
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
/* * 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... |
981 982 |
* 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... |
983 984 |
* MADV_REMOVE - the application wants to free up the given range of * pages and associated backing store. |
3866ea90d ksm: first tidy u... |
985 986 987 |
* 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... |
988 989 990 |
* 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... |
991 992 993 |
* 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... |
994 995 996 |
* 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... |
997 998 999 1000 1001 1002 1003 1004 1005 |
* 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. |
ecb8ac8b1 mm/madvise: intro... |
1006 1007 1008 1009 1010 |
* MADV_COLD - the application is not expected to use this memory soon, * deactivate pages in this range so that they can be reclaimed * easily if memory pressure hanppens. * MADV_PAGEOUT - the application is not expected to use this memory soon, * page out the pages in this range immediately. |
1da177e4c Linux-2.6.12-rc2 |
1011 1012 1013 1014 1015 |
* * 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... |
1016 1017 1018 |
* 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 |
1019 1020 1021 1022 1023 1024 |
* -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. */ |
0726b01e7 mm/madvise: pass ... |
1025 |
int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior) |
1da177e4c Linux-2.6.12-rc2 |
1026 |
{ |
05b743847 [PATCH] madvise: ... |
1027 |
unsigned long end, tmp; |
ec9bed9d3 mm/madvise.c: fix... |
1028 |
struct vm_area_struct *vma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
1029 1030 |
int unmapped_error = 0; int error = -EINVAL; |
f79777932 speed up madvise_... |
1031 |
int write; |
1da177e4c Linux-2.6.12-rc2 |
1032 |
size_t len; |
1998cc048 mm: make madvise(... |
1033 |
struct blk_plug plug; |
1da177e4c Linux-2.6.12-rc2 |
1034 |
|
057d33891 mm: untag user po... |
1035 |
start = untagged_addr(start); |
75927af8b mm: madvise(): co... |
1036 1037 |
if (!madvise_behavior_valid(behavior)) return error; |
df6c6500b mm/madvise.c: use... |
1038 |
if (!PAGE_ALIGNED(start)) |
84d96d897 mm: madvise: comp... |
1039 |
return error; |
df6c6500b mm/madvise.c: use... |
1040 |
len = PAGE_ALIGN(len_in); |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 |
/* Check to see whether len was rounded up from small -ve to zero */ if (len_in && !len) |
84d96d897 mm: madvise: comp... |
1044 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 1047 |
end = start + len; if (end < start) |
84d96d897 mm: madvise: comp... |
1048 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 1051 |
error = 0; if (end == start) |
84d96d897 mm: madvise: comp... |
1052 |
return error; |
5e451be75 mm/madvise: move ... |
1053 1054 1055 1056 |
#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... |
1057 |
write = madvise_need_mmap_write(behavior); |
dc0ef0df7 mm: make mmap_sem... |
1058 |
if (write) { |
0726b01e7 mm/madvise: pass ... |
1059 |
if (mmap_write_lock_killable(mm)) |
dc0ef0df7 mm: make mmap_sem... |
1060 1061 |
return -EINTR; } else { |
0726b01e7 mm/madvise: pass ... |
1062 |
mmap_read_lock(mm); |
dc0ef0df7 mm: make mmap_sem... |
1063 |
} |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 1067 |
/* * If the interval [start,end) covers some unmapped address * ranges, just ignore them, but return -ENOMEM at the end. |
05b743847 [PATCH] madvise: ... |
1068 |
* - different from the way of handling in mlock etc. |
1da177e4c Linux-2.6.12-rc2 |
1069 |
*/ |
0726b01e7 mm/madvise: pass ... |
1070 |
vma = find_vma_prev(mm, start, &prev); |
836d5ffd3 [PATCH] mm: fix m... |
1071 1072 |
if (vma && start > vma->vm_start) prev = vma; |
1998cc048 mm: make madvise(... |
1073 |
blk_start_plug(&plug); |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 1076 1077 |
for (;;) { /* Still start < end. */ error = -ENOMEM; if (!vma) |
84d96d897 mm: madvise: comp... |
1078 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1079 |
|
05b743847 [PATCH] madvise: ... |
1080 |
/* Here start < (end|vma->vm_end). */ |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 |
if (start < vma->vm_start) { unmapped_error = -ENOMEM; start = vma->vm_start; |
05b743847 [PATCH] madvise: ... |
1084 |
if (start >= end) |
84d96d897 mm: madvise: comp... |
1085 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1086 |
} |
05b743847 [PATCH] madvise: ... |
1087 1088 1089 1090 |
/* Here vma->vm_start <= start < (end|vma->vm_end) */ tmp = vma->vm_end; if (end < tmp) tmp = end; |
1da177e4c Linux-2.6.12-rc2 |
1091 |
|
05b743847 [PATCH] madvise: ... |
1092 1093 |
/* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */ error = madvise_vma(vma, &prev, start, tmp, behavior); |
1da177e4c Linux-2.6.12-rc2 |
1094 |
if (error) |
84d96d897 mm: madvise: comp... |
1095 |
goto out; |
05b743847 [PATCH] madvise: ... |
1096 |
start = tmp; |
90ed52ebe [PATCH] holepunch... |
1097 |
if (prev && start < prev->vm_end) |
05b743847 [PATCH] madvise: ... |
1098 1099 1100 |
start = prev->vm_end; error = unmapped_error; if (start >= end) |
84d96d897 mm: madvise: comp... |
1101 |
goto out; |
90ed52ebe [PATCH] holepunch... |
1102 1103 |
if (prev) vma = prev->vm_next; |
c1e8d7c6a mmap locking API:... |
1104 |
else /* madvise_remove dropped mmap_lock */ |
0726b01e7 mm/madvise: pass ... |
1105 |
vma = find_vma(mm, start); |
1da177e4c Linux-2.6.12-rc2 |
1106 |
} |
1da177e4c Linux-2.6.12-rc2 |
1107 |
out: |
84d96d897 mm: madvise: comp... |
1108 |
blk_finish_plug(&plug); |
f79777932 speed up madvise_... |
1109 |
if (write) |
0726b01e7 mm/madvise: pass ... |
1110 |
mmap_write_unlock(mm); |
0a27a14a6 mm: madvise avoid... |
1111 |
else |
0726b01e7 mm/madvise: pass ... |
1112 |
mmap_read_unlock(mm); |
0a27a14a6 mm: madvise avoid... |
1113 |
|
1da177e4c Linux-2.6.12-rc2 |
1114 1115 |
return error; } |
db08ca252 mm: make do_madvi... |
1116 1117 1118 |
SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) { |
0726b01e7 mm/madvise: pass ... |
1119 |
return do_madvise(current->mm, start, len_in, behavior); |
db08ca252 mm: make do_madvi... |
1120 |
} |
ecb8ac8b1 mm/madvise: intro... |
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec, size_t, vlen, int, behavior, unsigned int, flags) { ssize_t ret; struct iovec iovstack[UIO_FASTIOV], iovec; struct iovec *iov = iovstack; struct iov_iter iter; struct pid *pid; struct task_struct *task; struct mm_struct *mm; size_t total_len; unsigned int f_flags; if (flags != 0) { ret = -EINVAL; goto out; } ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter); if (ret < 0) goto out; pid = pidfd_get_pid(pidfd, &f_flags); if (IS_ERR(pid)) { ret = PTR_ERR(pid); goto free_iov; } task = get_pid_task(pid, PIDTYPE_PID); if (!task) { ret = -ESRCH; goto put_pid; } |
a68a0262a mm/madvise: remov... |
1155 |
if (!process_madvise_behavior_valid(behavior)) { |
ecb8ac8b1 mm/madvise: intro... |
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 |
ret = -EINVAL; goto release_task; } mm = mm_access(task, PTRACE_MODE_ATTACH_FSCREDS); if (IS_ERR_OR_NULL(mm)) { ret = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH; goto release_task; } total_len = iov_iter_count(&iter); while (iov_iter_count(&iter)) { iovec = iov_iter_iovec(&iter); ret = do_madvise(mm, (unsigned long)iovec.iov_base, iovec.iov_len, behavior); if (ret < 0) break; iov_iter_advance(&iter, iovec.iov_len); } if (ret == 0) ret = total_len - iov_iter_count(&iter); mmput(mm); |
ecb8ac8b1 mm/madvise: intro... |
1181 1182 1183 1184 1185 1186 1187 1188 1189 |
release_task: put_task_struct(task); put_pid: put_pid(pid); free_iov: kfree(iov); out: return ret; } |