diff options
| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-09-11 14:25:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:21 -0700 |
| commit | 0bd42136f7ae4ea1375da34c32838fb35eee8c59 (patch) | |
| tree | 0cbdcf537d072266e763f120fb26578920d5c97d /mm/zswap.c | |
| parent | 7c993e11aa59d9d1cefbd6acc8d84f2d8d46545a (diff) | |
mm/zswap: use postorder iteration when destroying rbtree
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Reviewed-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/zswap.c')
| -rw-r--r-- | mm/zswap.c | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/mm/zswap.c b/mm/zswap.c index efed4c8b7f5..841e35f1db2 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -790,26 +790,14 @@ static void zswap_frontswap_invalidate_page(unsigned type, pgoff_t offset) static void zswap_frontswap_invalidate_area(unsigned type) { struct zswap_tree *tree = zswap_trees[type]; - struct rb_node *node; - struct zswap_entry *entry; + struct zswap_entry *entry, *n; if (!tree) return; /* walk the tree and free everything */ spin_lock(&tree->lock); - /* - * TODO: Even though this code should not be executed because - * the try_to_unuse() in swapoff should have emptied the tree, - * it is very wasteful to rebalance the tree after every - * removal when we are freeing the whole tree. - * - * If post-order traversal code is ever added to the rbtree - * implementation, it should be used here. - */ - while ((node = rb_first(&tree->rbroot))) { - entry = rb_entry(node, struct zswap_entry, rbnode); - rb_erase(&entry->rbnode, &tree->rbroot); + rbtree_postorder_for_each_entry_safe(entry, n, &tree->rbroot, rbnode) { zbud_free(tree->pool, entry->handle); zswap_entry_cache_free(entry); atomic_dec(&zswap_stored_pages); |