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From: Juri Lelli <juri.lelli@gmail.com>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: mingo@redhat.com, peterz@infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/rt: Rework for_each_process_thread() iterations in tg_has_rt_tasks()
Date: Fri, 20 Apr 2018 12:58:52 +0200	[thread overview]
Message-ID: <20180420105852.GH24599@localhost.localdomain> (raw)
In-Reply-To: <0d7fbdab-b972-7f86-4090-b49f9315c868@virtuozzo.com>

On 20/04/18 12:43, Kirill Tkhai wrote:
> On 20.04.2018 12:25, Juri Lelli wrote:

[...]

> > Isn't this however checking against the current (dynamic) number of
> > runnable tasks/groups instead of the "static" group membership (which
> > shouldn't be affected by a task running state)?
> 
> Ah, you are sure. I forgot that rt_nr_running does not contain sleeping tasks.
> We need to check something else here. I'll try to find another way.

n/p. Maybe a per rt_rq flag linked to "static" membership (I didn't
really thought this through though :).

BTW, since you faced this problem, I guess this is on RT_GROUP_SCHED
enabled boxes, so I'd have a couple of questions (not strictly related
to the problem at hand):

 - do such boxes rely on RT throttling being performed at root level?
 - is RT_RUNTIME_SHARE enabled?

Thanks,

- Juri

  parent reply	other threads:[~2018-04-20 10:58 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 17:29 Kirill Tkhai
2018-04-20  9:25 ` Juri Lelli
2018-04-20  9:43   ` Kirill Tkhai
2018-04-20 10:06     ` [PATCH v2] " Kirill Tkhai
2018-04-20 14:11       ` Juri Lelli
2018-04-20 14:30         ` Kirill Tkhai
2018-04-20 15:27           ` Juri Lelli
2018-04-25 15:42       ` Kirill Tkhai
2018-04-25 19:49       ` Peter Zijlstra
2018-04-26  9:54         ` [PATCH v3]sched/rt: Stop " Kirill Tkhai
2020-01-23 21:56           ` Phil Auld
2020-01-24  9:09             ` Kirill Tkhai
2020-01-27 16:30               ` Phil Auld
2020-01-27 16:43             ` Peter Zijlstra
2020-01-27 16:56               ` Phil Auld
2020-01-27 17:00                 ` Peter Zijlstra
2020-01-27 17:45                   ` Phil Auld
2018-04-20 10:58     ` Juri Lelli [this message]
2018-04-20 11:21       ` [PATCH] sched/rt: Rework " Kirill Tkhai
2018-04-25 17:55 ` Peter Zijlstra
2018-04-26  9:26   ` Kirill Tkhai

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