From: Yuyang Du <yuyang.du@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
Benjamin Segall <bsegall@google.com>,
Paul Turner <pjt@google.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Matt Fleming <matt@codeblueprint.co.uk>
Subject: Re: [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks
Date: Mon, 20 Jun 2016 06:55:52 +0800 [thread overview]
Message-ID: <20160619225552.GC19934@intel.com> (raw)
In-Reply-To: <20160617161831.GM30927@twins.programming.kicks-ass.net>
On Fri, Jun 17, 2016 at 06:18:31PM +0200, Peter Zijlstra wrote:
> On Fri, Jun 17, 2016 at 06:02:39PM +0200, Peter Zijlstra wrote:
> > So yes, ho-humm, how to go about doing that bestest. Lemme have a play.
>
> This is what I came up with, not entirely pretty, but I suppose it'll
> have to do.
FWIW, I don't think the entire fix is pretty, so I will post my amended
fix still later.
> ---
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -724,6 +724,7 @@ void post_init_entity_util_avg(struct sc
> struct cfs_rq *cfs_rq = cfs_rq_of(se);
> struct sched_avg *sa = &se->avg;
> long cap = (long)(SCHED_CAPACITY_SCALE - cfs_rq->avg.util_avg) / 2;
> + u64 now = cfs_rq_clock_task(cfs_rq);
>
> if (cap > 0) {
> if (cfs_rq->avg.util_avg != 0) {
> @@ -738,7 +739,20 @@ void post_init_entity_util_avg(struct sc
> sa->util_sum = sa->util_avg * LOAD_AVG_MAX;
> }
>
> - update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, false);
> + if (entity_is_task(se)) {
> + struct task_struct *p = task_of(se);
> + if (p->sched_class != &fair_sched_class) {
> + /*
> + * For !fair tasks do attach_entity_load_avg()
> + * followed by detach_entity_load_avg() as per
> + * switched_from_fair().
> + */
> + se->avg.last_update_time = now;
> + return;
> + }
> + }
> +
> + update_cfs_rq_load_avg(now, cfs_rq, false);
> attach_entity_load_avg(cfs_rq, se);
> }
>
next prev parent reply other threads:[~2016-06-20 6:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-17 12:01 [PATCH 0/4] sched/fair: Fix PELT wobblies Peter Zijlstra
2016-06-17 12:01 ` [PATCH 1/4] sched: Optimize fork() paths Peter Zijlstra
2016-06-17 12:01 ` [PATCH 2/4] sched/fair: Fix PELT integrity for new groups Peter Zijlstra
2016-06-17 13:51 ` Vincent Guittot
2016-06-17 12:01 ` [PATCH 3/4] sched,cgroup: Fix cpu_cgroup_fork() Peter Zijlstra
2016-06-17 13:58 ` Vincent Guittot
2016-06-17 14:06 ` Peter Zijlstra
2016-06-17 12:01 ` [PATCH 4/4] sched,fair: Fix PELT integrity for new tasks Peter Zijlstra
2016-06-17 14:09 ` Vincent Guittot
2016-06-17 14:28 ` Peter Zijlstra
2016-06-17 16:02 ` Peter Zijlstra
2016-06-17 16:14 ` Vincent Guittot
2016-06-17 16:18 ` Peter Zijlstra
2016-06-19 22:55 ` Yuyang Du [this message]
2016-06-20 9:23 ` Vincent Guittot
2016-06-20 9:52 ` Peter Zijlstra
2016-06-20 10:07 ` Vincent Guittot
2016-06-21 11:43 ` Peter Zijlstra
2016-06-21 12:36 ` Vincent Guittot
2016-06-21 12:47 ` Peter Zijlstra
2016-06-21 12:56 ` Vincent Guittot
2016-06-20 11:35 ` Dietmar Eggemann
2016-06-20 12:35 ` Vincent Guittot
2016-06-20 14:49 ` Dietmar Eggemann
2016-06-21 8:41 ` Peter Zijlstra
2016-06-21 4:51 ` Yuyang Du
2016-06-24 13:03 ` Peter Zijlstra
2016-08-09 23:19 ` Yuyang Du
2016-06-21 13:17 ` Peter Zijlstra
2016-06-21 13:29 ` Vincent Guittot
2016-06-22 11:46 ` Peter Zijlstra
2016-06-23 15:35 ` Dietmar Eggemann
2016-06-23 17:15 ` Peter Zijlstra
2016-06-20 14:27 ` Peter Zijlstra
2016-06-23 11:19 ` Peter Zijlstra
2016-08-01 7:30 ` Wanpeng Li
2016-08-01 9:31 ` Mike Galbraith
2016-08-01 9:56 ` Wanpeng Li
2016-08-01 11:52 ` Mike Galbraith
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