Home
Reading
Searching
Subscribe
Sponsors
Statistics
Posting
Contact
Spam
Lists
Links
About
Hosting
Filtering
Features Download
Marketing
Archives
FAQ
Blog
 
Gmane
From: Cody P Schafer <cody <at> linux.vnet.ibm.com>
Subject: [PATCH 0/5] Add rbtree postorder iteration functions, runtime tests, and update zswap to use.
Newsgroups: gmane.linux.kernel
Date: Friday 26th July 2013 21:13:38 UTC (over 3 years ago)
Postorder iteration yields all of a node's children prior to yielding the
node
itself, and this particular implementation also avoids examining the leaf
links
in a node after that node has been yielded.

In what I expect will be it's most common usage, postorder iteration allows
the
deletion of every node in an rbtree without modifying the rbtree nodes (no
_requirement_ that they be nulled) while avoiding referencing child nodes
after
they have been "deleted" (most commonly, freed).

I have only updated zswap to use this functionality at this point, but
numerous
bits of code (most notably in the filesystem drivers) use a hand rolled
postorder iteration that NULLs child links as it traverses the tree. Each
of
those instances could be replaced with this common implementation.

Cody P Schafer (5):
  rbtree: add postorder iteration functions.
  rbtree: add rbtree_postorder_for_each_entry_safe() helper.
  rbtree_test: add test for postorder iteration.
  rbtree: allow tests to run as builtin
  mm/zswap: use postorder iteration when destroying rbtree

 include/linux/rbtree.h | 21 +++++++++++++++++++++
 lib/Kconfig.debug      |  2 +-
 lib/rbtree.c           | 40 ++++++++++++++++++++++++++++++++++++++++
 lib/rbtree_test.c      | 12 ++++++++++++
 mm/zswap.c             | 15 ++-------------
 5 files changed, 76 insertions(+), 14 deletions(-)

-- 
1.8.3.4

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to [email protected]  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email:  email@kvack.org 
 
CD: 4ms