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From: Davidlohr Bueso <dave@stgolabs.net>
To: Jason Low <jason.low2@hp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mike Galbraith <umgwanakikbuti@gmail.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg
Date: Mon, 15 Jun 2015 12:37:08 -0700	[thread overview]
Message-ID: <1434397028.1903.12.camel@stgolabs.net> (raw)
In-Reply-To: <CAGQ1y=4LL1AW9A1-PKGO24QiEFSL3Cg3+7K1meWoP3+rJbu8Jw@mail.gmail.com>

On Mon, 2015-06-15 at 11:34 -0700, Jason Low wrote:
> The CCAS technique was typically used in the slow paths for those
> other locks, where the chance of the operation returning false is
> higher.

That is true. Although I really want to use it in patch 4, I guess I
could move the check in there, and thus avoid having it in the fastpath.

Thanks,
Davidlohr


  reply	other threads:[~2015-06-15 19:37 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-19 17:24 [PATCH -tip 0/4] rtmutex: Spin on owner Davidlohr Bueso
2015-05-19 17:24 ` [PATCH 1/4] locking/rtmutex: Implement lockless top-waiter wakeup Davidlohr Bueso
2015-06-05 12:35   ` Thomas Gleixner
2015-06-16 19:29   ` [PATCH] futex: lower the lock contention on the HB lock during wake up Sebastian Andrzej Siewior
2015-06-16 19:50     ` Davidlohr Bueso
2015-06-17  8:33       ` [PATCH v2] " Sebastian Andrzej Siewior
2015-06-17 14:17         ` Mike Galbraith
2015-06-17 14:28           ` Sebastian Andrzej Siewior
2015-06-17 14:31             ` Mike Galbraith
2015-06-21  4:35             ` Mike Galbraith
2015-06-18 20:30         ` [tip:sched/core] futex: Lower " tip-bot for Sebastian Andrzej Siewior
2015-06-19 17:51         ` [PATCH v2] futex: lower " Kevin Hilman
2015-06-19 18:54           ` Thomas Gleixner
2015-06-19 19:32             ` Kevin Hilman
2015-06-19 19:33         ` [tip:sched/locking] futex: Lower " tip-bot for Sebastian Andrzej Siewior
2015-06-18 20:30   ` [tip:sched/core] locking/rtmutex: Implement lockless top-waiter wakeup tip-bot for Davidlohr Bueso
2015-05-19 17:24 ` [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg Davidlohr Bueso
2015-06-05 12:38   ` Thomas Gleixner
2015-06-06 15:27     ` Davidlohr Bueso
2015-06-15 18:34       ` Jason Low
2015-06-15 19:37         ` Davidlohr Bueso [this message]
2015-06-16  1:00           ` Jason Low
2015-05-19 17:24 ` [PATCH 3/4] locking/rtmutex: Update stale plist comments Davidlohr Bueso
2015-06-05 12:39   ` Thomas Gleixner
2015-06-18 20:57   ` [tip:sched/core] " tip-bot for Davidlohr Bueso
2015-06-19 19:33   ` [tip:sched/locking] " tip-bot for Davidlohr Bueso
2015-05-19 17:24 ` [PATCH -rfc 4/4] locking/rtmutex: Support spin on owner (osq) Davidlohr Bueso
2015-05-20  7:11   ` Paul Bolle
2015-05-25 20:35     ` Davidlohr Bueso
2015-05-29 15:19   ` Davidlohr Bueso
2015-05-29 18:01     ` Davidlohr Bueso
2015-06-05 13:59   ` Thomas Gleixner
2015-06-09  4:41     ` Davidlohr Bueso
2015-06-09  9:29       ` Thomas Gleixner
2015-06-09 11:21         ` Peter Zijlstra
2015-06-09 12:53           ` Thomas Gleixner
2015-05-25 20:35 ` [PATCH -tip 0/4] rtmutex: Spin on owner Davidlohr Bueso
2015-05-26 19:05   ` Thomas Gleixner

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