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 <yg...@konkuk.ac.kr>
Can you please repost with scheduler maintainers cc'd? Ingo Molnar <mi...@redhat.com> Peter Zijlstra <pet...@infradead.org> Thanks. -- tejun
