linux-kernel - Re: [PATCH v3 1/6] measure exec

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Message-ID: <1338374555.26856.243.camel@twins>
Date:	Wed, 30 May 2012 12:42:35 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	devel@...nvz.org, Paul Turner <pjt@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, handai.szj@...il.com,
	Andrew.Phillips@...x.com, Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v3 1/6] measure exec_clock for rt sched entities

On Wed, 2012-05-30 at 14:32 +0400, Glauber Costa wrote:
> >> +    for_each_sched_rt_entity(rt_se) {
> >> +            rt_rq = rt_rq_of_se(rt_se);
> >> +            schedstat_add(rt_rq, exec_clock, delta_exec);
> >> +    }
> >> +
> >>      if (!rt_bandwidth_enabled())
> >>              return;
> >
> > See, this just makes me sad.. you now have a double
> > for_each_sched_rt_entity() loop.
> 
> The way I read the rt.c code, it it is called from enqueue_task_rt only
> once. 

Ah, what I meant was, right after that !rt_bandwidth_enabled() muck we
do another for_each_sched_rt_entity() walk.
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