From da3e9e99b70d18309f9b8544def1aa54c39c4a3a Mon Sep 17 00:00:00 2001 From: Michel Lespinasse Date: Fri, 28 Sep 2012 10:19:23 +1000 Subject: [PATCH] rbtree: reference Documentation/rbtree.txt for usage instructions I recently started looking at the rbtree code (with an eye towards improving the augmented rbtree support, but I haven't gotten there yet). I noticed a lot of possible speed improvements, which I am now proposing in this patch set. Patches 1-4 are preparatory: remove internal functions from rbtree.h so that users won't be tempted to use them instead of the documented APIs, clean up some incorrect usages I've noticed (in particular, with the recently added fs/proc/proc_sysctl.c rbtree usage), reference the documentation so that people have one less excuse to miss it, etc. Patch 5 is a small module I wrote to check the rbtree performance. It creates 100 nodes with random keys and repeatedly inserts and erases them from an rbtree. Additionally, it has code to check for rbtree invariants after each insert or erase operation. Patches 6-12 is where the rbtree optimizations are done, and they touch only that one file, lib/rbtree.c . I am getting good results out of these - in my small benchmark doing rbtree insertion (including search) and erase, I'm seeing a 30% runtime reduction on Sandybridge E5, which is more than I initially thought would be possible. (the results aren't as impressive on my two other test hosts though, AMD barcelona and Intel Westmere, where I am seeing 14% runtime reduction only). The code size - both source (ommiting comments) and compiled - is also shorter after these changes. However, I do admit that the updated code is more arduous to read - one big reason for that is the removal of the tree rotation helpers, which added some overhead but also made it easier to reason about things locally. Overall, I believe this is an acceptable compromise, given that this code doesn't get modified very often, and that I have good tests for it. Upon Peter's suggestion, I added comments showing the rtree configuration before every rotation. I think they help; however it's still best to have a copy of the cormen/leiserson/rivest book when digging into this code. This patch: reference Documentation/rbtree.txt for usage instructions include/linux/rbtree.h included some basic usage instructions, while Documentation/rbtree.txt had some more complete and easier to follow instructions. Replacing the former with a reference to the latter. Signed-off-by: Michel Lespinasse Cc: Andrea Arcangeli Acked-by: David Woodhouse Cc: Rik van Riel Cc: Peter Zijlstra Cc: Daniel Santos Cc: Jens Axboe Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton --- include/linux/rbtree.h | 67 +----------------------------------------- 1 file changed, 1 insertion(+), 66 deletions(-) diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index 033b507b33b1..e6a807720ded 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -23,72 +23,7 @@ I know it's not the cleaner way, but in C (not in C++) to get performances and genericity... - Some example of insert and search follows here. The search is a plain - normal search over an ordered tree. The insert instead must be implemented - in two steps: First, the code must insert the element in order as a red leaf - in the tree, and then the support library function rb_insert_color() must - be called. Such function will do the not trivial work to rebalance the - rbtree, if necessary. - ------------------------------------------------------------------------ -static inline struct page * rb_search_page_cache(struct inode * inode, - unsigned long offset) -{ - struct rb_node * n = inode->i_rb_page_cache.rb_node; - struct page * page; - - while (n) - { - page = rb_entry(n, struct page, rb_page_cache); - - if (offset < page->offset) - n = n->rb_left; - else if (offset > page->offset) - n = n->rb_right; - else - return page; - } - return NULL; -} - -static inline struct page * __rb_insert_page_cache(struct inode * inode, - unsigned long offset, - struct rb_node * node) -{ - struct rb_node ** p = &inode->i_rb_page_cache.rb_node; - struct rb_node * parent = NULL; - struct page * page; - - while (*p) - { - parent = *p; - page = rb_entry(parent, struct page, rb_page_cache); - - if (offset < page->offset) - p = &(*p)->rb_left; - else if (offset > page->offset) - p = &(*p)->rb_right; - else - return page; - } - - rb_link_node(node, parent, p); - - return NULL; -} - -static inline struct page * rb_insert_page_cache(struct inode * inode, - unsigned long offset, - struct rb_node * node) -{ - struct page * ret; - if ((ret = __rb_insert_page_cache(inode, offset, node))) - goto out; - rb_insert_color(node, &inode->i_rb_page_cache); - out: - return ret; -} ------------------------------------------------------------------------ + See Documentation/rbtree.txt for documentation and samples. */ #ifndef _LINUX_RBTREE_H -- 2.39.5