linux-kernel - Re: [PATCH 1/9] sched: add schedule_timeout

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Message-ID: <20160322122345.GN6344@twins.programming.kicks-ass.net>
Date:	Tue, 22 Mar 2016 13:23:45 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/9] sched: add schedule_timeout_idle()

On Tue, Mar 22, 2016 at 12:00:18PM +0100, Michal Hocko wrote:

>  extern signed long schedule_timeout_interruptible(signed long timeout);
>  extern signed long schedule_timeout_killable(signed long timeout);
>  extern signed long schedule_timeout_uninterruptible(signed long timeout);
> +extern signed long schedule_timeout_idle(signed long timeout);

> +/*
> + * Like schedule_timeout_uninterruptible(), except this task will not contribute
> + * to load average.
> + */
> +signed long __sched schedule_timeout_idle(signed long timeout)
> +{
> +	__set_current_state(TASK_IDLE);
> +	return schedule_timeout(timeout);
> +}
> +EXPORT_SYMBOL(schedule_timeout_idle);

Yes we have 3 such other wrappers, but I've gotta ask: why? They seem
pretty pointless.

Why not kill the lot?