There are quite a few places in the kernel which implement a hashtable in a very similar way. Instead of having implementations of a hashtable all over the kernel, we can re-use the code. This patch series introduces a very simple hashtable implementation, and modifies three (random) modules to use it. I've limited it to 3 only so that it would be easy to review and modify, and to show that even at this number we already eliminate a big amount of duplicated code. If this basic hashtable looks ok, future code will include: - RCU support - Self locking (list_bl?) - Converting more code to use the hashtable Changes in V2: - Address review comments by Tejun Heo, Josh Triplett and Eric Beiderman (Thanks all!). - Rebase on top of latest master. - Convert more places to use the hashtable. Hopefully it will trigger more reviews by touching more subsystems. Sasha Levin (7): hashtable: introduce a small and naive hashtable user_ns: use new hashtable implementation mm,ksm: use new hashtable implementation workqueue: use new hashtable implementation mm/huge_memory: use new hashtable implementation tracepoint: use new hashtable implementation net,9p: use new hashtable implementation include/linux/hashtable.h | 75 ++++++++++++++++++++++++++++++++++++ kernel/tracepoint.c | 26 ++++-------- kernel/user.c | 53 +++++++++----------------- kernel/workqueue.c | 93 +++++++-------------------------------------- mm/huge_memory.c | 56 +++++---------------------- mm/ksm.c | 29 ++++---------- net/9p/error.c | 17 ++++---- 7 files changed, 144 insertions(+), 205 deletions(-) create mode 100644 include/linux/hashtable.h -- 1.7.8.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>