lkml.org 
[lkml]   [2016]   [Sep]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] cgroup/cpu: Fix tg_has_rt_task() malfunction
On Sun, Sep 18, 2016 at 11:23:10PM +0900, yingooyim wrote:
> Hi,
> I am a graduate student of System Software Lab. at Konkuk University
> (http://sslab.konkuk.ac.kr).
>
> This patch is to fix the malfunction of tg_has_rt_tasks(). The
> tg_has_rt_tasks() function is supposed to determine whether a task
> group includes an "rt task" or not. However, it returns true for
> "dl task" too. The origin of this problem is that rt_task() called
> by tg_has_rt_tasks() returns true for dl tasks. Because of this
> problem, tg_rt_schedulable() that calls tg_has_rt_tasks() returns
> –EBUSY if we try to initialize an rt task group, while a dl task
> is running. That is, you cannot run an rt task group when there
> exists a dl task in the system. Our patch provided in this post
> simply makes the tg_has_rt_tasks() function return false for dl
> tasks by calling dl_task() in the conditional statement.
>
> Previously we have provided another patch for rt_task() (more
> precisely rt_prio()) to resolve this problem as follows:
> https://patchwork.kernel.org/patch/9299267/
> However, a dependency issue were raised. So, we think that it is
> better to modify tg_has_rt_tasks() instead of rt_task() itself.
>
> Signed-off-by: Yin-goo Yim <ygyim@konkuk.ac.kr>

Can you please repost with scheduler maintainers cc'd?

Ingo Molnar <mingo@redhat.com>
Peter Zijlstra <peterz@infradead.org>

Thanks.

--
tejun

\
 
 \ /
  Last update: 2016-09-20 21:41    [W:0.050 / U:0.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site