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

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Message-Id: <1487786634-22641-1-git-send-email-longman@redhat.com>
Date:   Wed, 22 Feb 2017 13:03:51 -0500
From:   Waiman Long <longman@...hat.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH-tip 0/3] locking/rwsem: Minor twists to improve rwsem performance

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(-)

-- 
1.8.3.1