linux-kernel - Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

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Message-ID: <20130821183227.GA20050@redhat.com>
Date:	Wed, 21 Aug 2013 20:32:27 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Fernando Luis Vázquez Cao 
	<fernando_b1@....ntt.co.jp>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

On 08/21, Peter Zijlstra wrote:
>
> OK, so do not remove the MAX_SCHEDULE_TIMEOUT check from
> __schedule_timeout() and change the above to:
>
> static __always_inline long schedule_timeout(long timeout)
> {
> 	if (__builtin_constant_p(timeout) && timeout == MAX_SCHEDULE_TIMEOUT) {
> 		schedule();
> 		return timeout;
> 	}
> 	return __schedule_timeout(timeout);
> }

Agreed, this looks nice.

Hmm. And this can simplify some changes in linux/wait.h I am going
to resend.

Oleg.

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