linux-kernel - [PATCH v4 0/2] locking/qrwlock: More optimizations in qrwlock

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Date:	Wed, 17 Jun 2015 22:20:21 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>,
	Waiman Long <Waiman.Long@...com>
Subject: [PATCH v4 0/2] locking/qrwlock: More optimizations in qrwlock

v3->v4:
 - Remove the unnecessary _QW_WMASK check in
   queue_read_lock_slowpath().

v2->v3:
 - Fix incorrect commit log message in patch 1.

v1->v2:
 - Add microbenchmark data for the second patch

This patch set contains 2 patches on qrwlock. The first one is to
optimize the interrupt context reader slowpath.  The second one is
to optimize the writer slowpath.

Waiman Long (2):
  locking/qrwlock: Better optimization for interrupt context readers
  locking/qrwlock: Don't contend with readers when setting _QW_WAITING

 include/asm-generic/qrwlock.h |    4 ++--
 kernel/locking/qrwlock.c      |   41 +++++++++++++++++++++++++++++++----------
 2 files changed, 33 insertions(+), 12 deletions(-)

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