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

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Message-ID: <20130816164922.GA1573@redhat.com>
Date:	Fri, 16 Aug 2013 18:49:22 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Fernando Luis Vazquez Cao <fernando_b1@....ntt.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

On 08/16, Frederic Weisbecker wrote:
>
> tick_nohz_stop_idle() to iowait if we called tick_nohz_start_idle() with nr_iowait > 0.
> All we need is just a new field in ts-> that records on which state we entered
> idle.

Or we can turn ->idle_active into enum. And all other nr_iowait_cpu's
in this code should go away.

Personally I am fine either way.

Oleg.

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