linux-kernel - Re: [PATCH 1/3] idle: add support for tasks that inject idle

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Message-ID: <20161114150119.GG3142@twins.programming.kicks-ass.net>
Date:   Mon, 14 Nov 2016 16:01:19 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Chen, Yu C" <yu.c.chen@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 1/3] idle: add support for tasks that inject idle

On Wed, Nov 09, 2016 at 11:05:10AM -0800, Jacob Pan wrote:
> +void play_idle()
> +{
> +	/*
> +	 * Only FIFO tasks can disable the tick since they don't need the forced
> +	 * preemption.
> +	 */
> +	WARN_ON_ONCE(current->policy != SCHED_FIFO);
> +	WARN_ON_ONCE(current->nr_cpus_allowed != 1);
> +	WARN_ON_ONCE(!(current->flags & PF_KTHREAD));
> +	WARN_ON_ONCE(!(current->flags & PF_NO_SETAFFINITY));
> +	rcu_sleep_check();
> +
> +	preempt_disable();
> +	current->flags |= PF_IDLE;
> +	do_idle();
> +	current->flags &= ~PF_IDLE;
> +
> +	preempt_fold_need_resched();
> +	preempt_enable();
> +}
> +EXPORT_SYMBOL_GPL(play_idle);

Hurm.. didn't this initially also include the setup of the timer and
take an timeout argument?