From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, linux-kernel@vger.kernel.org
Cc: oleg@redhat.com, tj@kernel.org, paulmck@linux.vnet.ibm.com,
john.stultz@linaro.org, dimitrysh@google.com, romlem@google.com,
ccross@google.com, tkjos@google.com, peterz@infradead.org
Subject: [PATCH 0/2] locking/percpu-rwsem: Optimizations/tweaks
Date: Thu, 14 Jul 2016 20:25:45 +0200 [thread overview]
Message-ID: <20160714182545.786693675@infradead.org> (raw)
As reported by John and Dmitry, Android tickles bad behaviour in
cgroup_threadgroup_rwsem.
These two patches attempt to address the issue by optimizing the percpu-rwsem
slow path and second add a bias knob to the percpu-rwsem that allows disabling
the fast path which improves writer latency by getting rid of a
synchronize_sched() call.
---
fs/super.c | 3 +-
include/linux/percpu-rwsem.h | 96 +++++++++++++++--
kernel/cgroup.c | 2 +-
kernel/locking/percpu-rwsem.c | 246 +++++++++++++++++++++++++-----------------
4 files changed, 239 insertions(+), 108 deletions(-)
next reply other threads:[~2016-07-14 18:31 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-14 18:25 Peter Zijlstra [this message]
2016-07-14 18:25 ` [PATCH 1/2] locking/percpu-rwsem: Optimize readers and reduce global impact Peter Zijlstra
2016-07-15 16:30 ` Oleg Nesterov
2016-07-15 19:47 ` Peter Zijlstra
2016-07-18 18:23 ` kbuild test robot
2016-07-18 22:51 ` kbuild test robot
2016-07-14 18:25 ` [PATCH 2/2] locking/percpu-rwsem: Introduce bias knob Peter Zijlstra
2016-07-14 18:37 ` Peter Zijlstra
2016-07-14 18:43 ` Oleg Nesterov
2016-07-14 18:56 ` Peter Zijlstra
2016-07-14 19:20 ` Peter Zijlstra
2016-07-14 19:29 ` Paul E. McKenney
2016-07-14 19:38 ` Peter Zijlstra
2016-07-14 19:54 ` Paul E. McKenney
2016-07-15 13:27 ` Oleg Nesterov
2016-07-15 13:39 ` Paul E. McKenney
2016-07-15 13:45 ` Oleg Nesterov
2016-07-15 15:38 ` Paul E. McKenney
2016-07-15 16:49 ` Oleg Nesterov
2016-07-15 18:01 ` Paul E. McKenney
2016-07-16 17:10 ` [PATCH] rcu_sync: simplify the state machine, introduce __rcu_sync_enter() Oleg Nesterov
2016-07-16 18:40 ` Oleg Nesterov
2016-07-18 11:54 ` Peter Zijlstra
2016-07-18 13:44 ` Oleg Nesterov
2016-07-19 20:50 ` Paul E. McKenney
2016-07-20 15:13 ` Oleg Nesterov
2016-07-20 20:58 ` Paul E. McKenney
2016-07-21 17:34 ` Oleg Nesterov
2016-07-20 17:16 ` Oleg Nesterov
2016-07-20 21:31 ` Paul E. McKenney
2016-07-21 17:34 ` Oleg Nesterov
2016-07-22 3:26 ` Paul E. McKenney
2016-07-25 17:01 ` Oleg Nesterov
2016-07-25 17:05 ` John Stultz
2016-07-25 17:26 ` Oleg Nesterov
2016-08-09 8:48 ` Peter Zijlstra
2016-07-25 17:49 ` Paul E. McKenney
2016-07-15 13:42 ` [PATCH 2/2] locking/percpu-rwsem: Introduce bias knob Oleg Nesterov
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