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lib/interval_tree: fast overlap detection

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Allow interval trees to quickly check for overlaps to avoid unnecesary
tree lookups in interval_tree_iter_first().

As of this patch, all interval tree flavors will require using a
'rb_root_cached' such that we can have the leftmost node easily
available.  While most users will make use of this feature, those with
special functions (in addition to the generic insert, delete, search
calls) will avoid using the cached option as they can do funky things
with insertions -- for example, vma_interval_tree_insert_after().

[[email protected]: fix deadlock from typo vm_lock_anon_vma()]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Davidlohr Bueso <[email protected]>
Signed-off-by: Jérôme Glisse <[email protected]>
Acked-by: Christian König <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Doug Ledford <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Christian Benvenuti <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2017-09-08 16:15:08 -07:00 • committed by Linus Torvalds
commit f808c13fd3
33 changed files with 145 additions and 105 deletions
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4
mm/rmap.c
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@ -391,7 +391,7 @@ void unlink_anon_vmas(struct vm_area_struct *vma)
* Leave empty anon_vmas on the list - we'll need
* to free them outside the lock.
*/
if (RB_EMPTY_ROOT(&anon_vma->rb_root)) {
if (RB_EMPTY_ROOT(&anon_vma->rb_root.rb_root)) {
anon_vma->parent->degree--;
continue;
}
@ -425,7 +425,7 @@ static void anon_vma_ctor(void *data)
init_rwsem(&anon_vma->rwsem);
atomic_set(&anon_vma->refcount, 0);
anon_vma->rb_root = RB_ROOT;
anon_vma->rb_root = RB_ROOT_CACHED;
}
void __init anon_vma_init(void)