[RFC PATCH v2 0/5] futex: Introducing throughput-optimized futexes

[Waiman Long <Waiman.Long@hpe.com>]

 v1->v2:
  - Adds an explicit lock hand-off mechanism.
  - Adds timeout support.
  - Simplifies the required userspace code.
  - Fixes a number of problems in the v1 code.

This patchset introduces a new futex implementation called
throughput-optimized (TO) futexes. It is similar to PI futexes in its
calling convention, but provides better throughput than the wait-wake
futexes by encouraging lock stealing and optimistic spinning.

Waiman Long (5):
  futex: Add futex_set_timer() helper function
  futex: Rename futex_pi_state to futex_state
  futex: Throughput-optimized (TO) futexes
  futex: Add timeout support to TO futexes
  futex, doc: TO futexes document

 Documentation/00-INDEX     |    2 +
 Documentation/to-futex.txt |  140 ++++++++
 include/linux/sched.h      |    4 +-
 include/uapi/linux/futex.h |    4 +
 kernel/futex.c             |  810 +++++++++++++++++++++++++++++++++++++++-----
 5 files changed, 869 insertions(+), 91 deletions(-)
 create mode 100644 Documentation/to-futex.txt