Hi Peter, Ps: Pardon me if my understanding is wrong. OS is VRTX (Versatile Real Time Execute) from the Mentor Graphics. Yes it is an RTOS.... where the timeliness is determined already... like I have decided to run one task (say X) periodically once in 250ms. So I would assign a priority P for this task X. Confusion is about the timeliness. Like if I have already determined the priority P for this task X and the system works fine with the priority P to decide running the task X. what if I want to add one new task (there is a system call through which I can create a task from some application code dynamically). Wouldn't the timeliness be disturbed? My view of the running tasks is - The priority P assigned to this task X is such that after the every 250ms, the tasks being executed would definitely have the priority P' where P' < P. so after every 250ms, what ever task is running could be swapped and task X could be run since the priority resolves the issue. Now I am adding one new task with some priority (say also < P). would the system still work well as earlier? Though the new task has priority which is < P, would the timeliness still be maintained? Ps: Pardon me if my understanding is wrong. Thanks and Regards Vikram Upparpalli Telephone: 040-3063 3535 Mobile: 9985152191 -----Original Message----- From: Peter Teoh [mailto:htmldeveloper@xxxxxxxxx] Sent: Wednesday, October 22, 2008 10:19 AM To: Vikram_Upparpalli Subject: Re: sched summary what OS? linux kernel? what devices is that? FPPS is for realtime control right? and what is your confusion about? On Fri, Oct 17, 2008 at 6:59 PM, Vikram_Upparpalli <Vikram_Upparpalli@xxxxxxxxxx> wrote: > Hi All, > > This might mean a little out of linux thing ... but definitely kernel related > > I am working with a Hierarchical FPPS (Fixed priority preemptive scheduler). I need to find out a way to add one new task (one with a forever loop) without disturbing the already decided priority levels system. The priority levels are set such that one of the decided tasks runs at the rate of 250ms. > > I am a little confused with the timeliness of FPPS. > > Could you please help? > > > > Thanks and Regards > > Vikram Upparpalli > Telephone: 040-3063 3535 > Mobile: 9985152191 > > > -----Original Message----- > From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of Henrik Austad > Sent: Friday, October 17, 2008 3:44 PM > To: kernelnewbies@xxxxxxxxxxxx > Subject: FYI: sched summary > > Hi list! > > I've just finished writing up a summary of O(1) and CFS. It's still not > completely done (I know of a few places where the wording is unfortunate), > but it has reached the state where it can be read by others :-) This is my > way of giving something back to this list, which has helped me so many times > already. > > So, for those interested, > http://folk.ntnu.no/henrikau/sched/ > > Please send me feedback on things that are wrong (I do not want to spread > false information), unclear etc. > > And, before people ask if this is a way of getting you to do my homework (it > is after all part of a project) - the evaluation finished about 1 hour ago, > so whatever you say and do, won't change that outcome, only the content now > available to everybody else. c") > > -- > henrik > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > > > DISCLAIMER: > This email (including any attachments) is intended for the sole use of the intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE COMPANY INFORMATION. Any review or reliance by others or copying or distribution or forwarding of any or all of the contents in this message is STRICTLY PROHIBITED. If you are not the intended recipient, please contact the sender by email and delete all copies; your cooperation in this regard is appreciated. > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Peter Teoh DISCLAIMER: This email (including any attachments) is intended for the sole use of the intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE COMPANY INFORMATION. Any review or reliance by others or copying or distribution or forwarding of any or all of the contents in this message is STRICTLY PROHIBITED. If you are not the intended recipient, please contact the sender by email and delete all copies; your cooperation in this regard is appreciated. -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
