linux-kernel - Re: [RFC][PATCH 00/32] Nohz cpusets v2 (adaptive tickless kernel)

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Date:	Tue, 22 May 2012 17:50:51 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Geoff Levand <geoff@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Zen Lin <zen@...nhuawei.org>
Subject: Re: [RFC][PATCH 00/32] Nohz cpusets v2 (adaptive tickless kernel)

On Tue, 2012-05-22 at 23:31 +0200, Thomas Gleixner wrote:

> diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
> index 590900c..dc8ecc3 100644
> --- a/arch/x86/kernel/tsc.c
> +++ b/arch/x86/kernel/tsc.c
> @@ -109,6 +109,10 @@ static int __init tsc_setup(char *str)
>  {
>  	if (!strcmp(str, "reliable"))
>  		tsc_clocksource_reliable = 1;
> +	if (!strcmp(str, "perfect")) {
> +		tsc_clocksource_reliable = 1;
> +		sched_clock_stable = 1;
> +	}

	else if(!strcmp(str, "pony")) {
		tsc_clocksource_reliable = 1;
		sched_clock_stable = 1;
		tsc_perfect_smp_synchronization = 1;
	}

-- Steve

>  	if (!strncmp(str, "noirqtime", 9))
>  		no_sched_irq_time = 1;
>  	return 1;
>  


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