From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Davidlohr Bueso <dave@stgolabs.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
huang ying <huang.ying.caritas@gmail.com>,
Waiman Long <longman@redhat.com>
Subject: [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2 follow-up patches
Date: Mon, 15 Apr 2019 16:58:27 -0400 [thread overview]
Message-ID: <20190415205829.32707-1-longman@redhat.com> (raw)
This series contain 2 follow-up patches to alleviate the performance
regression found in the page_fault1 test of the will-it-scale benchmark.
This does not recover all the lost performance, but reclaim a sizeable
portion of it.
The regression was found on an Intel system. I have run the test on
an AMD system. The regression wasn't seen there. There are only minor
variations in performance. Perhaps the page fault path is quite different
between Intel and AMD systems.
Waiman Long (2):
locking/rwsem: Clarify usage of owner's nonspinaable bit
locking/rwsem: Adaptive disabling of reader optimistic spinning
include/linux/rwsem.h | 2 +-
kernel/locking/lock_events_list.h | 9 +-
kernel/locking/rwsem.c | 178 +++++++++++++++++++++---------
3 files changed, 131 insertions(+), 58 deletions(-)
--
2.18.1
next reply other threads:[~2019-04-15 20:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 20:58 Waiman Long [this message]
2019-04-15 20:58 ` [PATCH-tip 1/2] locking/rwsem: Clarify usage of owner's nonspinaable bit Waiman Long
2019-04-15 20:58 ` [PATCH-tip 2/2] locking/rwsem: Adaptive disabling of reader optimistic spinning Waiman Long
2019-04-16 13:10 ` [PATCH-tip 0/2] locking/rwsem: Rwsem rearchitecture part 2 follow-up patches Peter Zijlstra
2019-04-16 13:18 ` Waiman Long
2019-04-16 14:17 ` Peter Zijlstra
2019-04-16 17:03 ` Waiman Long
2019-04-16 17:37 ` Peter Zijlstra
2019-04-16 19:49 ` Waiman Long
2019-04-17 5:57 ` Ingo Molnar
2019-04-17 20:30 ` Waiman Long
2019-04-18 8:02 ` Ingo Molnar
2019-04-18 12:42 ` Waiman Long
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