linux-kernel - Re: [RFC PATCH 01/15] nohz_task: New mask for cpus having nohz task

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Message-ID: <4D145339.1080205@cn.fujitsu.com>
Date:	Fri, 24 Dec 2010 16:00:57 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 01/15] nohz_task: New mask for cpus having nohz task

On 12/20/2010 11:24 PM, Frederic Weisbecker wrote:
>  
> +config NO_HZ_TASK
> +       bool "Tickless task"
> +       depends on HAVE_NO_HZ_TASK && NO_HZ && SMP && HIGH_RES_TIMERS
> +       help
> +         When a task runs alone on a CPU and switches into this mode,
> +         the timer interrupt will only trigger when it is strictly
> +         needed.

Why it depends on SMP?

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