From ed8ea8150182f8d715fceb3b175ef0a9ebacd872 Mon Sep 17 00:00:00 2001 From: Michel Lespinasse Date: Mon, 8 Oct 2012 16:31:45 -0700 Subject: mm: add CONFIG_DEBUG_VM_RB build option Add a CONFIG_DEBUG_VM_RB build option for the previously existing DEBUG_MM_RB code. Now that Andi Kleen modified it to avoid using recursive algorithms, we can expose it a bit more. Also extend this code to validate_mm() after stack expansion, and to check that the vma's start and last pgoffs have not changed since the nodes were inserted on the anon vma interval tree (as it is important that the nodes be reindexed after each such update). Signed-off-by: Michel Lespinasse Cc: Andrea Arcangeli Cc: Rik van Riel Cc: Peter Zijlstra Cc: Daniel Santos Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mm.h | 3 +++ include/linux/rmap.h | 3 +++ 2 files changed, 6 insertions(+) (limited to 'include/linux') diff --git a/include/linux/mm.h b/include/linux/mm.h index 0cdab4e0f814..0e6f9c9f2123 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1386,6 +1386,9 @@ struct anon_vma_chain *anon_vma_interval_tree_iter_first( struct rb_root *root, unsigned long start, unsigned long last); struct anon_vma_chain *anon_vma_interval_tree_iter_next( struct anon_vma_chain *node, unsigned long start, unsigned long last); +#ifdef CONFIG_DEBUG_VM_RB +void anon_vma_interval_tree_verify(struct anon_vma_chain *node); +#endif #define anon_vma_interval_tree_foreach(avc, root, start, last) \ for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ diff --git a/include/linux/rmap.h b/include/linux/rmap.h index dce44f7d3ed8..b2cce644ffc7 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -66,6 +66,9 @@ struct anon_vma_chain { struct list_head same_vma; /* locked by mmap_sem & page_table_lock */ struct rb_node rb; /* locked by anon_vma->mutex */ unsigned long rb_subtree_last; +#ifdef CONFIG_DEBUG_VM_RB + unsigned long cached_vma_start, cached_vma_last; +#endif }; #ifdef CONFIG_MMU -- cgit v1.2.3