tree e95c41295270c55ef27a3534894f066f31719ecc
parent 6e954b9e90c3a7157c0c1457dd3919e2a1345d23
author Nick Piggin <nickpiggin@yahoo.com.au> 1136710901 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136780021 -0800

[PATCH] radix tree: early termination of tag clearing

Correctly determine the tags to be cleared in radix_tree_delete() so we
don't keep moving up the tree clearing tags that we don't need to.  For
example, if a tag is simply not set in the deleted item, nor anywhere up
the tree, radix_tree_delete() would attempt to clear it up the entire
height of the tree.

Also, tag_set() was made conditional so as not to dirty too many cachelines
high up in the radix tree.  Instead, put this logic into
radix_tree_tag_set().

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>