linux-kernel - Re: [RFC][PATCH 0/7] sched: Optimize sched

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Message-ID: <20131210144744.GN3694@twins.programming.kicks-ass.net>
Date:	Tue, 10 Dec 2013 15:47:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andy Lutomirski <luto@...capital.net>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...il.com>,
	hpa@...or.com
Subject: Re: [RFC][PATCH 0/7] sched: Optimize sched_clock bits

On Tue, Dec 03, 2013 at 04:10:53PM +0100, Peter Zijlstra wrote:
> Also, static_key and related APIs suck donkey ballz -- I did indeed
> promise myself I'd not step into that bike shed contest but having had
> to use them again *painfull*.

> POST:
> 
> [    5.061000] sched_clock_stable: 1
> [   18.916000] (cold) sched_clock: 1335206
> [   32.576000] (cold) local_clock: 1365236
> [   32.580000] (warm) sched_clock: 11771
> [   32.584000] (warm) local_clock: 14725

It looks like this was using the jiffies (tsc_disabled) instead of rdtsc path.

/me curses static_key and co more.
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