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From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <Waiman.Long@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	Davidlohr Bueso <dave@stgolabs.net>,
	Jason Low <jason.low2@hpe.com>,
	Scott J Norton <scott.norton@hpe.com>,
	Douglas Hatch <doug.hatch@hpe.com>
Subject: Re: [RFC PATCH v2 3/5] futex: Throughput-optimized (TO) futexes
Date: Thu, 22 Sep 2016 15:23:47 +0200	[thread overview]
Message-ID: <20160922132347.GX5012@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1474378963-15496-4-git-send-email-Waiman.Long@hpe.com>

On Tue, Sep 20, 2016 at 09:42:41AM -0400, Waiman Long wrote:
> +/*
> + * Spinning threshold before enabling lock handoff.
> + * Each sleep will decrement the threshold by 1/32 of the start value.
> + */
> +#define TO_SPIN_THRESHOLD	(1 << 13)
> +#define TO_SLEEP_DECREMENT	(TO_SPIN_THRESHOLD/32)

Argh, we should really get rid of those stupid numbers. Wasn't there a
patch set working on implementing paravirt functions that would make all
this fixable in a sane way?

  parent reply	other threads:[~2016-09-22 13:23 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-20 13:42 [RFC PATCH v2 0/5] futex: Introducing throughput-optimized futexes Waiman Long
2016-09-20 13:42 ` [RFC PATCH v2 1/5] futex: Add futex_set_timer() helper function Waiman Long
2016-09-22 21:31   ` Thomas Gleixner
2016-09-23  0:45     ` Waiman Long
2016-09-20 13:42 ` [RFC PATCH v2 2/5] futex: Rename futex_pi_state to futex_state Waiman Long
2016-09-20 13:42 ` [RFC PATCH v2 3/5] futex: Throughput-optimized (TO) futexes Waiman Long
2016-09-21  6:59   ` Mike Galbraith
2016-09-21 23:37     ` Waiman Long
2016-09-22  7:49       ` Peter Zijlstra
2016-09-22 13:04         ` Waiman Long
2016-09-22 13:34         ` Thomas Gleixner
2016-09-22 14:41           ` Davidlohr Bueso
2016-09-22 14:46             ` Thomas Gleixner
2016-09-22 15:11               ` Davidlohr Bueso
2016-09-22 20:08                 ` Waiman Long
2016-09-22 20:28                   ` Waiman Long
2016-09-22 20:38                     ` Thomas Gleixner
2016-09-22 21:48                       ` Waiman Long
2016-09-23 13:02                         ` Thomas Gleixner
2016-09-26 22:02                           ` Waiman Long
2016-09-22 21:39                     ` Davidlohr Bueso
2016-09-22 21:41                       ` Thomas Gleixner
2016-09-22 21:59                         ` Waiman Long
2016-09-27 19:02                           ` [PATCH v2 -tip] locking/rtmutex: Reduce top-waiter blocking on a lock Davidlohr Bueso
2016-10-24 18:08                             ` Davidlohr Bueso
2016-10-24 18:48                               ` Thomas Gleixner
2016-09-24  1:28                         ` [PATCH " Davidlohr Bueso
2016-09-26 21:40                           ` Waiman Long
2016-09-22 19:56           ` [RFC PATCH v2 3/5] futex: Throughput-optimized (TO) futexes Waiman Long
2016-09-22 20:26             ` Thomas Gleixner
2016-09-22 21:13               ` Waiman Long
2016-09-22 13:23   ` Peter Zijlstra [this message]
2016-09-22 17:21     ` Waiman Long
2016-09-20 13:42 ` [RFC PATCH v2 4/5] futex: Add timeout support to TO futexes Waiman Long
2016-09-20 13:42 ` [RFC PATCH v2 5/5] futex, doc: TO futexes document Waiman Long

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