[PATCH-tip 0/3] locking/rwsem: Minor twists to improve rwsem performance

[Waiman Long]

Patch 1 checks wait_list without lock when spinners are present.

Patch 2 moves down the rwsem_down_read_failed() function after the
optimistic spinning section so that functions in that section can
be used.

Patch 3 undoes active read lock ASAP when either the spinners are
present or the trylock fails.

Waiman Long (3):
  locking/rwsem: Check wait_list without lock if spinner present
  locking/rwsem: move down rwsem_down_read_failed()
  locking/rwsem: Stop active read lock ASAP

 kernel/locking/rwsem-xadd.c | 126 +++++++++++++++++++++++++++-----------------
 1 file changed, 78 insertions(+), 48 deletions(-)

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1.8.3.1