From: Yuyang Du <yuyang.du@intel.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Benjamin Segall <bsegall@google.com>,
Paul Turner <pjt@google.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>
Subject: Re: [PATCH v4 2/5] sched/fair: Fix attaching task sched avgs twice when switching to fair or changing task group
Date: Wed, 8 Jun 2016 02:16:54 +0800 [thread overview]
Message-ID: <20160607181654.GG8105@intel.com> (raw)
In-Reply-To: <CAKfTPtD5e1DnCCTTQ54Df8ybA6YKR_5=d=tsoNraZSiAs6JbOA@mail.gmail.com>
On Tue, Jun 07, 2016 at 10:09:14AM +0200, Vincent Guittot wrote:
> >> A much more simple solution would be
> >> to prevent last_update_time to be initialized with this special value.
> >> We can initialize the last_update_time of a sched_entity to 1 as an
> >> example which is easier than these changes.
> >
> > Then at least, we must differentiate CONFIG_FAIR_GROUP_SCHED and
> > !CONFIG_FAIR_GROUP_SCHED. And I am not sure whether this is a simpler
>
> Why do you want to differentiate ? we already have
> sa->last_update_time = 0; in init_entity_runnable_average. We just
> have to change it by sa->last_update_time = 1;
If !CONFIG_FAIR_GROUP_SCHED, we don't have task_move_group_fair().
If last_update_time != 0, we won't attach it for new task. Correct?
next prev parent reply other threads:[~2016-06-08 2:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 0:20 [PATCH v4 0/5] sched/fair: Fix attach and detach sched avgs for task group change or sched class change Yuyang Du
2016-06-06 0:20 ` [PATCH v4 1/5] sched/fair: Clean up attach_entity_load_avg() Yuyang Du
2016-06-06 13:30 ` Matt Fleming
2016-06-06 13:40 ` Vincent Guittot
2016-06-06 14:06 ` Matt Fleming
2016-06-06 14:27 ` Peter Zijlstra
2016-06-06 0:20 ` [PATCH v4 2/5] sched/fair: Fix attaching task sched avgs twice when switching to fair or changing task group Yuyang Du
2016-06-06 9:54 ` Peter Zijlstra
2016-06-06 19:38 ` Yuyang Du
2016-06-06 12:32 ` Vincent Guittot
2016-06-06 19:05 ` Yuyang Du
2016-06-07 8:09 ` Vincent Guittot
2016-06-07 18:16 ` Yuyang Du [this message]
2016-06-06 0:20 ` [PATCH v4 3/5] sched/fair: Skip detach sched avgs for new task when changing task groups Yuyang Du
2016-06-06 9:58 ` Peter Zijlstra
2016-06-06 14:03 ` Matt Fleming
2016-06-06 19:15 ` Yuyang Du
2016-06-06 0:20 ` [PATCH v4 4/5] sched/fair: Move load and util avgs from wake_up_new_task() to sched_fork() Yuyang Du
2016-06-06 0:20 ` [PATCH v4 5/5] sched/fair: Add inline to detach_entity_load_evg() Yuyang Du
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