linux-kernel - [PATCH 0/2] locking/spinlock_debug: Change it to a mostly fair lock

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Date:   Wed,  1 Feb 2017 13:26:22 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: [PATCH 0/2] locking/spinlock_debug: Change it to a mostly fair lock

The current debug spinlock implementation is a TATAS unfair lock. This
can occasionally lead to system lockup with a debug kernel because
of the unfairness of the lock rather than inherent locking problem.

This patch set changes the debug spinlock implementation to a
mostly fair spinlock based on the MCS lock similar to what is done
in qspinlock.

Waiman Long (2):
  locking/spinlock_debug: Reduce lockup suspected message clutter
  locking/spinlock_debug: Reduce lock cacheline contention

 include/linux/spinlock_types.h  |  8 +++--
 kernel/locking/spinlock_debug.c | 73 ++++++++++++++++++++++++++++++-----------
 2 files changed, 58 insertions(+), 23 deletions(-)

-- 
1.8.3.1