Hello, Linus.
This pull request contains Kent's per-cpu reference counter. It has
gone through several iterations since the last time and the dynamic
allocation is gone. The usual usage is relatively straight-forward
although async kill confirm interface, which is not used int most
cases, is somewhat icky. There also are some interface concerns -
e.g. I'm not sure about passing in @relesae callback during init as
that becomes funny when we later implement synchronous kill_and_drain
- but nothing too serious and it's quite useable now.
cgroup_subsys_state refcnting has already been converted and we should
convert module refcnt (Kent?).
Please pull from the following branch to receive the per-cpu reference
counter.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-3.11
Thanks.
----------------------------------------------------------------
Kent Overstreet (2):
percpu: implement generic percpu refcounting
percpu-refcount: Don't use silly cmpxchg()
Tejun Heo (6):
percpu-refcount: consistently use plain (non-sched) RCU
percpu-refcount: cosmetic updates
percpu-refcount: add __must_check to percpu_ref_init() and don't use
ACCESS_ONCE() in percpu_ref_kill_rcu()
percpu-refcount: implement percpu_ref_cancel_init()
percpu-refcount: implement percpu_tryget() along with
percpu_ref_kill_and_confirm()
percpu-refcount: use RCU-sched insted of normal RCU
include/linux/percpu-refcount.h | 174 ++++++++++++++++++++++++++++++++++++++++
lib/Makefile | 2 +-
lib/percpu-refcount.c | 158 ++++++++++++++++++++++++++++++++++++
3 files changed, 333 insertions(+), 1 deletion(-)
create mode 100644 include/linux/percpu-refcount.h
create mode 100644 lib/percpu-refcount.c
--
tejun
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