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>,
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>
Subject: Re: [PATCH v3 2/5] sched/fair: Skip detach and attach new group task
Date: Thu, 2 Jun 2016 07:50:58 +0800 [thread overview]
Message-ID: <20160601235058.GB8105@intel.com> (raw)
In-Reply-To: <CAKfTPtBPkBu0qbOm3fPhbDZAa6t=aW6VE9bps_9k8dmA0k3=cw@mail.gmail.com>
On Thu, Jun 02, 2016 at 09:40:18AM +0200, Vincent Guittot wrote:
> On 2 June 2016 at 01:41, Yuyang Du <yuyang.du@intel.com> wrote:
> > On Thu, Jun 02, 2016 at 09:29:53AM +0200, Vincent Guittot wrote:
> >> > My response to your above two comments:
> >> >
> >> > As I said, there can be four possibilities going through the above sequences:
> >> >
> >> > (1) on_rq, (2) !on_rq, (a) was fair class (representing last_update_time != 0),
> >> > (b) never was fair class (representing last_update_time == 0, but may not be
> >> > limited to this)
> >> >
> >> > Crossing them, we have (1)(a), (1)(b), (2)(a), and (2)(b).
> >> >
> >> > Some will attach twice, which are (1)(b) and (2)(b), the other will attach
> >> > once, which are (1)(a) and (2)(a). The difficult part is they can be attached
> >> > at different places.
> >>
> >> ok for (1)(b) but not for (2)(b) and it's far from "attached mostly
> >> twice every time"
> >
> > You are right. That claim is reckless, I will change it to:
> > "sometimes attached twice".
>
> Or you can just describe the used case (1)(b) which is the only one AFAICT
You are right again, ;)
next prev parent reply other threads:[~2016-06-02 7:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 3:41 [PATCH v3 0/5] sched/fair: Fix attach and detach sched avgs for task group change or sched class change Yuyang Du
2016-06-01 3:41 ` [PATCH v3 1/5] sched/fair: Clean up attach_entity_load_avg() Yuyang Du
2016-06-01 3:41 ` [PATCH v3 2/5] sched/fair: Skip detach and attach new group task Yuyang Du
2016-06-01 12:20 ` Vincent Guittot
2016-06-01 19:21 ` Yuyang Du
2016-06-02 7:29 ` Vincent Guittot
2016-06-01 23:41 ` Yuyang Du
2016-06-02 7:40 ` Vincent Guittot
2016-06-01 23:50 ` Yuyang Du [this message]
2016-06-01 3:41 ` [PATCH v3 3/5] sched/fair: Skip detach sched avgs for new task when changing task groups Yuyang Du
2016-06-01 3:41 ` [PATCH v3 4/5] sched/fair: Move load and util avgs from wake_up_new_task() to sched_fork() Yuyang Du
2016-06-01 12:24 ` Vincent Guittot
2016-06-01 18:58 ` Yuyang Du
2016-06-01 3:41 ` [PATCH v3 5/5] sched/fair: Add inline to detach_entity_load_evg() Yuyang Du
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