linux-kernel - Re: [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks

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Date:	Wed, 22 Jun 2016 13:46:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Dietmar Eggemann <dietmar.eggemann@....com>,
	Yuyang Du <yuyang.du@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Benjamin Segall <bsegall@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks

On Tue, Jun 21, 2016 at 03:29:49PM +0200, Vincent Guittot wrote:
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -692,6 +692,7 @@ void init_entity_runnable_average(struct
> >
> >  static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq);
> >  static int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq);
> > +static void update_tg_load_avg(struct cfs_rq *cfs_rq, int force);
> >  static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se);
> >
> >  /*
> > @@ -757,7 +758,8 @@ void post_init_entity_util_avg(struct sc
> >                 }
> >         }
> >
> > -       update_cfs_rq_load_avg(now, cfs_rq, false);
> > +       if (update_cfs_rq_load_avg(now, cfs_rq, false))
> > +               update_tg_load_avg(cfs_rq, false);
> 
> You should move update_tg_load_avg after attach_entity_load_avg to
> take into account the newly attached task

Right you are, I've also updated the comment to reflect this.