linux-kernel - Re: [RFC PATCH 0/4] sched: Improve cpu load accounting with nohz

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Message-ID: <20160118002331.GB1914@X58A-UD3R>
Date:	Mon, 18 Jan 2016 09:23:31 +0900
From:	Byungchul Park <byungchul.park@....com>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>
Subject: Re: [RFC PATCH 0/4] sched: Improve cpu load accounting with nohz

On Fri, Jan 15, 2016 at 04:56:36PM +0000, Dietmar Eggemann wrote:
> Another point ... 'active=1' (function header: @active: !0 for NOHZ_FULL
> is a little bit misleading) is also true for when __update_cpu_load() is
> called from update_cpu_load_active(). In this case tickless_load
> wouldn't have to be set at all since pending_updates is 1,
> decay_load_missed() can handle that by bailing in case missed_updates = 0.

Hello Dietmar.

> 
> Couldn't we set tickless_load only in case:
> 
> unsigned long tickless_load = (active && pending_updates > 1) ?
> this_rq->cpu_load[0] : 0;

IMHO, this looks better even though it does not change much.

Thank you,
Byungchul