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Message-ID: <CAOVSwNHoNuNBsuUecZhF0iWOL3PbJQt0cHR7Evf+gW6Q6SGA7Q@mail.gmail.com> Date: Fri, 30 Sep 2011 21:12:58 +0200 From: "Tadeus (Eus) Prastowo" <0x657573@...glemail.com> To: linux-kernel@...r.kernel.org Subject: Re: [Priority Inheritance] SCHED_FIFO or SCHED_RR? Anyone familiar with the Linux scheduler, please? On Wed, Sep 28, 2011 at 1:06 AM, Tadeus (Eus) Prastowo <0x657573@...glemail.com> wrote: > Hi! > > When a SCHED_RR task with RT priority X blocks on a > priority-inheriting mutex held by a SCHED_NORMAL task with nice value > Y, RT-Mutex code will change the SCHED_NORMAL task priority to that of > the SCHED_RR task and based on the new priority, will change the > scheduling class too. But, each task retains its own scheduling > policy. > > This means that the task inheriting the SCHED_RR priority will be > scheduled using SCHED_FIFO policy because task_tick_rt does not > enforce the SCHED_RR time slice when the task policy is not SCHED_RR. > > Why should a SCHED_NORMAL task inheriting the priority of a SCHED_RR > task get the privilege of SCHED_FIFO task for running as long as it > wishes even when the task giving the inheritance does not have such > privilege? > > Thank you very much. > > Please kindly put me in the CC since I am not subscribed to the list. > > -- > Eus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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