LCOV - code coverage report
Current view: top level - mm - interval_tree.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 19 26 73.1 %
Date: 2014-02-18 Functions: 14 17 82.4 %
Branches: 72 110 65.5 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * mm/interval_tree.c - interval tree for mapping->i_mmap
       3                 :            :  *
       4                 :            :  * Copyright (C) 2012, Michel Lespinasse <walken@google.com>
       5                 :            :  *
       6                 :            :  * This file is released under the GPL v2.
       7                 :            :  */
       8                 :            : 
       9                 :            : #include <linux/mm.h>
      10                 :            : #include <linux/fs.h>
      11                 :            : #include <linux/rmap.h>
      12                 :            : #include <linux/interval_tree_generic.h>
      13                 :            : 
      14                 :            : static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
      15                 :            : {
      16                 :            :         return v->vm_pgoff;
      17                 :            : }
      18                 :            : 
      19                 :            : static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
      20                 :            : {
      21                 :   31003684 :         return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
      22                 :            : }
      23                 :            : 
      24 [ +  + ][ +  + ]:   44904039 : INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.linear.rb,
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      25                 :            :                      unsigned long, shared.linear.rb_subtree_last,
      26                 :            :                      vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
      27                 :            : 
      28                 :            : /* Insert node immediately after prev in the interval tree */
      29                 :          0 : void vma_interval_tree_insert_after(struct vm_area_struct *node,
      30                 :            :                                     struct vm_area_struct *prev,
      31                 :            :                                     struct rb_root *root)
      32                 :            : {
      33                 :            :         struct rb_node **link;
      34                 :            :         struct vm_area_struct *parent;
      35                 :            :         unsigned long last = vma_last_pgoff(node);
      36                 :            : 
      37                 :            :         VM_BUG_ON(vma_start_pgoff(node) != vma_start_pgoff(prev));
      38                 :            : 
      39         [ +  + ]:   12288688 :         if (!prev->shared.linear.rb.rb_right) {
      40                 :            :                 parent = prev;
      41                 :   10338122 :                 link = &prev->shared.linear.rb.rb_right;
      42                 :            :         } else {
      43                 :    1950566 :                 parent = rb_entry(prev->shared.linear.rb.rb_right,
      44                 :            :                                   struct vm_area_struct, shared.linear.rb);
      45         [ +  + ]:    1950566 :                 if (parent->shared.linear.rb_subtree_last < last)
      46                 :    1950566 :                         parent->shared.linear.rb_subtree_last = last;
      47         [ +  + ]:    3692701 :                 while (parent->shared.linear.rb.rb_left) {
      48                 :    1742135 :                         parent = rb_entry(parent->shared.linear.rb.rb_left,
      49                 :            :                                 struct vm_area_struct, shared.linear.rb);
      50         [ +  + ]:    1742135 :                         if (parent->shared.linear.rb_subtree_last < last)
      51                 :    1742135 :                                 parent->shared.linear.rb_subtree_last = last;
      52                 :            :                 }
      53                 :    1950566 :                 link = &parent->shared.linear.rb.rb_left;
      54                 :            :         }
      55                 :            : 
      56                 :   12288688 :         node->shared.linear.rb_subtree_last = last;
      57                 :   12288688 :         rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
      58                 :            :         rb_insert_augmented(&node->shared.linear.rb, root,
      59                 :            :                             &vma_interval_tree_augment);
      60                 :   12288635 : }
      61                 :            : 
      62                 :            : static inline unsigned long avc_start_pgoff(struct anon_vma_chain *avc)
      63                 :            : {
      64                 :   58137946 :         return vma_start_pgoff(avc->vma);
      65                 :            : }
      66                 :            : 
      67                 :            : static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
      68                 :            : {
      69                 :            :         return vma_last_pgoff(avc->vma);
      70                 :            : }
      71                 :            : 
      72 [ #  # ][ #  # ]:   97118817 : INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
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      73                 :            :                      avc_start_pgoff, avc_last_pgoff,
      74                 :            :                      static inline, __anon_vma_interval_tree)
      75                 :            : 
      76                 :          0 : void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
      77                 :            :                                    struct rb_root *root)
      78                 :            : {
      79                 :            : #ifdef CONFIG_DEBUG_VM_RB
      80                 :            :         node->cached_vma_start = avc_start_pgoff(node);
      81                 :            :         node->cached_vma_last = avc_last_pgoff(node);
      82                 :            : #endif
      83                 :            :         __anon_vma_interval_tree_insert(node, root);
      84                 :   31003751 : }
      85                 :            : 
      86                 :          0 : void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
      87                 :            :                                    struct rb_root *root)
      88                 :            : {
      89                 :            :         __anon_vma_interval_tree_remove(node, root);
      90                 :   31003560 : }
      91                 :            : 
      92                 :            : struct anon_vma_chain *
      93                 :          0 : anon_vma_interval_tree_iter_first(struct rb_root *root,
      94                 :            :                                   unsigned long first, unsigned long last)
      95                 :            : {
      96                 :          0 :         return __anon_vma_interval_tree_iter_first(root, first, last);
      97                 :            : }
      98                 :            : 
      99                 :            : struct anon_vma_chain *
     100                 :          0 : anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
     101                 :            :                                  unsigned long first, unsigned long last)
     102                 :            : {
     103                 :          0 :         return __anon_vma_interval_tree_iter_next(node, first, last);
     104                 :            : }
     105                 :            : 
     106                 :            : #ifdef CONFIG_DEBUG_VM_RB
     107                 :            : void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
     108                 :            : {
     109                 :            :         WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
     110                 :            :         WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
     111                 :            : }
     112                 :            : #endif

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