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Subject: Re: [RFC][PATCH 00/32] Nohz cpusets v2 (adaptive tickless kernel)
From: Steven Rostedt <rostedt@goodmis.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Gilad Ben-Yossef <gilad@benyossef.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>, linaro-sched-sig@lists.linaro.org,
        Alessio Igor Bogani <abogani@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Avi Kivity <avi@redhat.com>,
        Chris Metcalf <cmetcalf@tilera.com>, Christoph Lameter <cl@linux.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Geoff Levand <geoff@infradead.org>, Ingo Molnar <mingo@kernel.org>,
        Max Krasnyansky <maxk@qualcomm.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Sven-Thorsten Dietrich <thebigcorporation@gmail.com>,
        Zen Lin <zen@openhuawei.org>
Date: Tue, 22 May 2012 17:50:51 -0400
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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;
>