From: Yuyang Du <yuyang.du@intel.com>
To: Matt Fleming <matt@codeblueprint.co.uk>
Cc: peterz@infradead.org, mingo@kernel.org,
linux-kernel@vger.kernel.org, bsegall@google.com, pjt@google.com,
morten.rasmussen@arm.com, vincent.guittot@linaro.org,
dietmar.eggemann@arm.com
Subject: Re: [PATCH v4 3/5] sched/fair: Skip detach sched avgs for new task when changing task groups
Date: Tue, 7 Jun 2016 03:15:52 +0800 [thread overview]
Message-ID: <20160606191552.GE8105@intel.com> (raw)
In-Reply-To: <20160606140338.GS2658@codeblueprint.co.uk>
On Mon, Jun 06, 2016 at 03:03:38PM +0100, Matt Fleming wrote:
> > #ifdef CONFIG_FAIR_GROUP_SCHED
> > -static void task_move_group_fair(struct task_struct *p)
> > +static void task_move_group_fair(struct task_struct *p, bool fork)
> > {
> > - detach_task_cfs_rq(p);
> > + /*
> > + * Newly forked task should not be removed from any cfs_rq
> > + */
> > + if (!fork)
> > + detach_task_cfs_rq(p);
> > set_task_rq(p, task_cpu(p));
> > attach_task_cfs_rq(p);
> > /*
>
> Wouldn't it be more symmetric to add,
>
> if (p->se.avg.last_update_time)
> __update_load_avg(...)
>
> to detach_entity_load_avg() so that there's no need to pass the @fork
> parameter all the way down the stack
Up to this point, we can't. But we should be able to if we move the next
patch (4/5) before this patch. I should have changed my mindset with that
patch. Good advice though, thanks, Matt.
next prev parent reply other threads:[~2016-06-07 3:13 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
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 [this message]
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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