From: Waiman Long <waiman.long@hp.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Scott J Norton <scott.norton@hp.com>,
Douglas Hatch <doug.hatch@hp.com>
Subject: Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support
Date: Tue, 14 Jul 2015 14:47:56 -0400 [thread overview]
Message-ID: <55A5595C.80403@hp.com> (raw)
In-Reply-To: <20150712082158.GR19282@twins.programming.kicks-ass.net>
On 07/12/2015 04:21 AM, Peter Zijlstra wrote:
> On Sat, Jul 11, 2015 at 04:36:56PM -0400, Waiman Long wrote:
>> Like the native qspinlock, using the pending bit when it is lightly
>> loaded to acquire the lock is faster than going through the PV queuing
>> process which is even slower than the native queuing process. It also
>> avoids loading two additional cachelines (the MCS and PV nodes).
>>
>> This patch adds the pending bit support for PV qspinlock. The
>> pending bit code has a smaller spin threshold. It will default back
>> to the queuing method if it cannot acquired the lock within a certain
>> time limit.
> -ENONUMBERS
Will send out an updated patchset with patch-to-patch performance numbers.
Cheers,
Longman
next prev parent reply other threads:[~2015-07-14 18:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-11 20:36 [PATCH 0/7] locking/qspinlock: Enhance pvqspinlock & introduce queued unfair lock Waiman Long
2015-07-11 20:36 ` [PATCH 1/7] locking/pvqspinlock: Only kick CPU at unlock time Waiman Long
2015-07-13 12:02 ` Peter Zijlstra
2015-07-13 12:31 ` Peter Zijlstra
2015-07-15 1:24 ` Waiman Long
2015-07-13 13:48 ` Peter Zijlstra
2015-07-14 9:31 ` Peter Zijlstra
2015-07-15 1:31 ` Waiman Long
2015-08-03 17:00 ` [tip:locking/core] " tip-bot for Waiman Long
2015-07-11 20:36 ` [PATCH 2/7] locking/pvqspinlock: Allow vCPUs kick-ahead Waiman Long
2015-07-13 13:52 ` Peter Zijlstra
2015-07-15 1:38 ` Waiman Long
2015-07-11 20:36 ` [PATCH 3/7] locking/pvqspinlock: Implement wait-early for overcommitted guest Waiman Long
2015-07-12 8:23 ` Peter Zijlstra
2015-07-13 19:50 ` Davidlohr Bueso
2015-07-15 1:39 ` Waiman Long
2015-07-11 20:36 ` [PATCH 4/7] locking/pvqspinlock: Collect slowpath lock statistics Waiman Long
2015-07-12 8:22 ` Peter Zijlstra
2015-07-14 18:48 ` Waiman Long
2015-07-11 20:36 ` [PATCH 5/7] locking/pvqspinlock: Add pending bit support Waiman Long
2015-07-12 8:21 ` Peter Zijlstra
2015-07-14 18:47 ` Waiman Long [this message]
2015-07-11 20:36 ` [PATCH 6/7] locking/qspinlock: A fairer queued unfair lock Waiman Long
2015-07-12 8:21 ` Peter Zijlstra
2015-07-14 18:47 ` Waiman Long
2015-07-14 20:45 ` Peter Zijlstra
2015-07-11 20:36 ` [PATCH 7/7] locking/qspinlock: Collect queued unfair lock slowpath statistics Waiman Long
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