linux-kernel - Re: [tg_shares_up rewrite v3 09/11] sched: demand based update_cfs

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Message-ID: <1289563959.2084.241.camel@laptop>
Date:	Fri, 12 Nov 2010 13:12:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Pierre Bourdon <pbourdon@...ellency.fr>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Karl Rister <kmr@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [tg_shares_up rewrite v3 09/11] sched: demand based
 update_cfs_load()

On Fri, 2010-11-12 at 11:53 +0100, Peter Zijlstra wrote:
> On Thu, 2010-11-11 at 19:24 -0800, Paul Turner wrote:
> > +#ifdef CONFIG_FAIR_GROUP_SCHED
> > +       cfs_rq->load_unacc_exec_time += delta_exec;
> > +       if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window)
> > {
> > +               update_cfs_load(cfs_rq);
> > +               update_cfs_shares(cfs_rq, 0);
> 
> Why not:
> +		cfs_rq->load_unacc_exec_time -= sysctl_sched_shares_window;
> 
> (although you probably want to read the sysctl value into a local
> variable using ACCESS_ONCE() and use that for both cases).

Ah, I see why not, still that reset looks better here than in that other
function.
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