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mm: set up vma iterator for vma_iter_prealloc() calls
Set the correct limits for vma_iter_prealloc() calls so that the maple tree can be smarter about how many nodes are needed. Link: https://lkml.kernel.org/r/20230724183157.3939892-11-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Peng Zhang <zhangpeng.00@bytedance.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett
Andrew Morton
parent
f72cf24a86
commit
b5df092264
@ -701,6 +701,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
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if (vma != vma_next(&vmi))
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return -EFAULT;
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vma_iter_prev_range(&vmi);
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/*
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* cover the whole range: [new_start, old_end)
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*/
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@ -1052,23 +1052,21 @@ static inline void vma_iter_config(struct vma_iterator *vmi,
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/*
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* VMA Iterator functions shared between nommu and mmap
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*/
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static inline int vma_iter_prealloc(struct vma_iterator *vmi)
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static inline int vma_iter_prealloc(struct vma_iterator *vmi,
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struct vm_area_struct *vma)
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{
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return mas_preallocate(&vmi->mas, NULL, GFP_KERNEL);
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return mas_preallocate(&vmi->mas, vma, GFP_KERNEL);
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}
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static inline void vma_iter_clear(struct vma_iterator *vmi,
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unsigned long start, unsigned long end)
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static inline void vma_iter_clear(struct vma_iterator *vmi)
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{
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mas_set_range(&vmi->mas, start, end - 1);
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mas_store_prealloc(&vmi->mas, NULL);
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}
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static inline int vma_iter_clear_gfp(struct vma_iterator *vmi,
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unsigned long start, unsigned long end, gfp_t gfp)
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{
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vmi->mas.index = start;
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vmi->mas.last = end - 1;
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__mas_set_range(&vmi->mas, start, end - 1);
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mas_store_gfp(&vmi->mas, NULL, gfp);
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if (unlikely(mas_is_err(&vmi->mas)))
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return -ENOMEM;
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@ -1105,8 +1103,7 @@ static inline void vma_iter_store(struct vma_iterator *vmi,
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((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
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vma_iter_invalidate(vmi);
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vmi->mas.index = vma->vm_start;
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vmi->mas.last = vma->vm_end - 1;
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__mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1);
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mas_store_prealloc(&vmi->mas, vma);
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}
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@ -1117,8 +1114,7 @@ static inline int vma_iter_store_gfp(struct vma_iterator *vmi,
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((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
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vma_iter_invalidate(vmi);
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vmi->mas.index = vma->vm_start;
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vmi->mas.last = vma->vm_end - 1;
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__mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1);
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mas_store_gfp(&vmi->mas, vma, gfp);
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if (unlikely(mas_is_err(&vmi->mas)))
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return -ENOMEM;
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69
mm/mmap.c
69
mm/mmap.c
@ -397,7 +397,8 @@ static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma)
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VMA_ITERATOR(vmi, mm, 0);
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struct address_space *mapping = NULL;
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if (vma_iter_prealloc(&vmi))
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vma_iter_config(&vmi, vma->vm_start, vma->vm_end);
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if (vma_iter_prealloc(&vmi, vma))
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return -ENOMEM;
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vma_iter_store(&vmi, vma);
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@ -649,19 +650,16 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
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/* Only handles expanding */
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VM_WARN_ON(vma->vm_start < start || vma->vm_end > end);
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if (vma_iter_prealloc(vmi))
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/* Note: vma iterator must be pointing to 'start' */
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vma_iter_config(vmi, start, end);
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if (vma_iter_prealloc(vmi, vma))
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goto nomem;
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vma_prepare(&vp);
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vma_adjust_trans_huge(vma, start, end, 0);
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/* VMA iterator points to previous, so set to start if necessary */
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if (vma_iter_addr(vmi) != start)
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vma_iter_set(vmi, start);
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vma->vm_start = start;
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vma->vm_end = end;
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vma->vm_pgoff = pgoff;
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/* Note: mas must be pointing to the expanding VMA */
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vma_iter_store(vmi, vma);
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vma_complete(&vp, vmi, vma->vm_mm);
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@ -687,19 +685,19 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
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WARN_ON((vma->vm_start != start) && (vma->vm_end != end));
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if (vma_iter_prealloc(vmi))
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if (vma->vm_start < start)
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vma_iter_config(vmi, vma->vm_start, start);
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else
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vma_iter_config(vmi, end, vma->vm_end);
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if (vma_iter_prealloc(vmi, NULL))
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return -ENOMEM;
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init_vma_prep(&vp, vma);
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vma_prepare(&vp);
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vma_adjust_trans_huge(vma, start, end, 0);
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if (vma->vm_start < start)
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vma_iter_clear(vmi, vma->vm_start, start);
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if (vma->vm_end > end)
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vma_iter_clear(vmi, end, vma->vm_end);
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vma_iter_clear(vmi);
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vma->vm_start = start;
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vma->vm_end = end;
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vma->vm_pgoff = pgoff;
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@ -973,7 +971,17 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
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if (err)
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return NULL;
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if (vma_iter_prealloc(vmi))
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if (vma_start < vma->vm_start || vma_end > vma->vm_end)
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vma_expanded = true;
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if (vma_expanded) {
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vma_iter_config(vmi, vma_start, vma_end);
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} else {
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vma_iter_config(vmi, adjust->vm_start + adj_start,
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adjust->vm_end);
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}
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if (vma_iter_prealloc(vmi, vma))
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return NULL;
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init_multi_vma_prep(&vp, vma, adjust, remove, remove2);
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@ -982,8 +990,6 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
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vma_prepare(&vp);
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vma_adjust_trans_huge(vma, vma_start, vma_end, adj_start);
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if (vma_start < vma->vm_start || vma_end > vma->vm_end)
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vma_expanded = true;
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vma->vm_start = vma_start;
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vma->vm_end = vma_end;
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@ -1923,7 +1929,7 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address)
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struct vm_area_struct *next;
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unsigned long gap_addr;
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int error = 0;
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MA_STATE(mas, &mm->mm_mt, 0, 0);
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MA_STATE(mas, &mm->mm_mt, vma->vm_start, address);
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if (!(vma->vm_flags & VM_GROWSUP))
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return -EFAULT;
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@ -1948,6 +1954,10 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address)
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/* Check that both stack segments have the same anon_vma? */
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}
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if (next)
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mas_prev_range(&mas, address);
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__mas_set_range(&mas, vma->vm_start, address - 1);
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if (mas_preallocate(&mas, vma, GFP_KERNEL))
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return -ENOMEM;
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@ -1993,7 +2003,6 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address)
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anon_vma_interval_tree_pre_update_vma(vma);
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vma->vm_end = address;
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/* Overwrite old entry in mtree. */
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mas_set_range(&mas, vma->vm_start, address - 1);
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mas_store_prealloc(&mas, vma);
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anon_vma_interval_tree_post_update_vma(vma);
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spin_unlock(&mm->page_table_lock);
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@ -2038,6 +2047,10 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address)
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return -ENOMEM;
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}
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if (prev)
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mas_next_range(&mas, vma->vm_start);
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__mas_set_range(&mas, address, vma->vm_end - 1);
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if (mas_preallocate(&mas, vma, GFP_KERNEL))
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return -ENOMEM;
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@ -2084,7 +2097,6 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address)
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vma->vm_start = address;
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vma->vm_pgoff -= grow;
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/* Overwrite old entry in mtree. */
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mas_set_range(&mas, address, vma->vm_end - 1);
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mas_store_prealloc(&mas, vma);
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anon_vma_interval_tree_post_update_vma(vma);
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spin_unlock(&mm->page_table_lock);
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@ -2325,10 +2337,6 @@ int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
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if (!new)
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return -ENOMEM;
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err = -ENOMEM;
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if (vma_iter_prealloc(vmi))
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goto out_free_vma;
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if (new_below) {
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new->vm_end = addr;
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} else {
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@ -2336,6 +2344,11 @@ int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
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new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT);
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}
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err = -ENOMEM;
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vma_iter_config(vmi, new->vm_start, new->vm_end);
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if (vma_iter_prealloc(vmi, new))
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goto out_free_vma;
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err = vma_dup_policy(vma, new);
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if (err)
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goto out_free_vmi;
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@ -2693,7 +2706,6 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
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vma_iter_next_range(&vmi);
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}
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/* Actually expand, if possible */
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if (vma &&
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!vma_expand(&vmi, vma, merge_start, merge_end, vm_pgoff, next)) {
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@ -2790,7 +2802,7 @@ cannot_expand:
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goto close_and_free_vma;
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error = -ENOMEM;
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if (vma_iter_prealloc(&vmi))
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if (vma_iter_prealloc(&vmi, vma))
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goto close_and_free_vma;
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/* Lock the VMA since it is modified after insertion into VMA tree */
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@ -3053,7 +3065,8 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
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if (vma && vma->vm_end == addr && !vma_policy(vma) &&
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can_vma_merge_after(vma, flags, NULL, NULL,
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addr >> PAGE_SHIFT, NULL_VM_UFFD_CTX, NULL)) {
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if (vma_iter_prealloc(vmi))
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vma_iter_config(vmi, vma->vm_start, addr + len);
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if (vma_iter_prealloc(vmi, vma))
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goto unacct_fail;
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init_vma_prep(&vp, vma);
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@ -3068,6 +3081,8 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
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goto out;
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}
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if (vma)
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vma_iter_next_range(vmi);
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/* create a vma struct for an anonymous mapping */
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vma = vm_area_alloc(mm);
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if (!vma)
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33
mm/nommu.c
33
mm/nommu.c
@ -583,7 +583,8 @@ static int delete_vma_from_mm(struct vm_area_struct *vma)
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{
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VMA_ITERATOR(vmi, vma->vm_mm, vma->vm_start);
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if (vma_iter_prealloc(&vmi)) {
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vma_iter_config(&vmi, vma->vm_start, vma->vm_end);
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if (vma_iter_prealloc(&vmi, vma)) {
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pr_warn("Allocation of vma tree for process %d failed\n",
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current->pid);
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return -ENOMEM;
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@ -591,7 +592,7 @@ static int delete_vma_from_mm(struct vm_area_struct *vma)
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cleanup_vma_from_mm(vma);
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/* remove from the MM's tree and list */
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vma_iter_clear(&vmi, vma->vm_start, vma->vm_end);
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vma_iter_clear(&vmi);
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return 0;
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}
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/*
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@ -1054,9 +1055,6 @@ unsigned long do_mmap(struct file *file,
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if (!vma)
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goto error_getting_vma;
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if (vma_iter_prealloc(&vmi))
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goto error_vma_iter_prealloc;
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region->vm_usage = 1;
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region->vm_flags = vm_flags;
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region->vm_pgoff = pgoff;
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@ -1198,6 +1196,10 @@ unsigned long do_mmap(struct file *file,
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share:
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BUG_ON(!vma->vm_region);
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vma_iter_config(&vmi, vma->vm_start, vma->vm_end);
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if (vma_iter_prealloc(&vmi, vma))
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goto error_just_free;
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setup_vma_to_mm(vma, current->mm);
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current->mm->map_count++;
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/* add the VMA to the tree */
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@ -1244,14 +1246,6 @@ error_getting_region:
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len, current->pid);
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show_mem();
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return -ENOMEM;
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error_vma_iter_prealloc:
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kmem_cache_free(vm_region_jar, region);
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vm_area_free(vma);
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pr_warn("Allocation of vma tree for process %d failed\n", current->pid);
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show_mem();
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return -ENOMEM;
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}
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unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len,
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@ -1336,12 +1330,6 @@ int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
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if (!new)
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goto err_vma_dup;
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if (vma_iter_prealloc(vmi)) {
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pr_warn("Allocation of vma tree for process %d failed\n",
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current->pid);
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goto err_vmi_preallocate;
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}
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/* most fields are the same, copy all, and then fixup */
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*region = *vma->vm_region;
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new->vm_region = region;
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@ -1355,6 +1343,13 @@ int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
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region->vm_pgoff = new->vm_pgoff += npages;
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}
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vma_iter_config(vmi, new->vm_start, new->vm_end);
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if (vma_iter_prealloc(vmi, vma)) {
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pr_warn("Allocation of vma tree for process %d failed\n",
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current->pid);
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goto err_vmi_preallocate;
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}
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if (new->vm_ops && new->vm_ops->open)
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new->vm_ops->open(new);
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