Thanks Gaggery! On Mar 20, 2:58 am, Tsai Gaggery <[email protected]> wrote: > I think the chapter 2 of Professional Linux Kernel Architecture will > be helpful to understand the CFS. It not only describes the concept > but source code exploring. > > 2012/3/20 Glenn Kasten <[email protected]>: > > > > > > > > > > > I'm sorry but generic Linux is beyond the scope of this group. I suggest > > doing a web search for the specific topics you're interested in. However, > > here are a few links to help you get started: > > http://en.wikipedia.org/wiki/Completely_Fair_Scheduler > > http://www.ibm.com/developerworks/linux/library/l-completely-fair-sch... > > http://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt > > http://lxr.linux.no/linux+v3.3/kernel/sched/fair.c > > > On Monday, March 19, 2012 10:22:20 AM UTC-7, Deborah wrote: > > >> Glenn thanks for your reply! I'm really confused. Could you explain > >> how the CFS work? > >> Does it divide the CPU time into epochs? > >> In a single epoch, has every process a specified time quantum that is > >> computed at the beginning of each epoch? > >> If yes, is 'virtual runtime' set to zero in each epoch or is it an > >> approximated average? > >> Help please!!! :( > > >> On Mar 19, 4:21 pm, Glenn Kasten <[email protected]> wrote: > >> > Threads voluntarily assign themselves a nice priority within the > >> > permitted > >> > range, and activity manager assigns threads of an app process to an > >> > appropriate cpuctl cgroup. > > >> > On Friday, March 16, 2012 6:38:57 AM UTC-7, Deborah wrote: > > >> > > I am trying to get a better understanding on ANDROID CFS. I have some > >> > > doubt on scheduler's behavior. > >> > > The difference between Android scheduler and Linux scheduler > >> > > Scheduler > >> > > — 5 files — The Android kernel also contains slight changes to the > >> > > CPU > >> > > process scheduler and time-keeping algorithms. We don’t know the > >> > > history of these changes, and the impact was not evident based on a > >> > > cursory examination. > >> > > Do you know which are this files? > >> > > If I understand, Process.THREAD_PRIORITY_DEFAULT or > >> > > Process.THREAD_PRIORITY_BACKGROUND are 'nice' value. How does Android > >> > > convert 'nice' value in 'timeslice'? > >> > > What is the initial value of 'virtual runtime' in Android and how to > >> > > calculate? > >> > > In Android, is 'cgroups' use to define scheduling classes? The > >> > > following application states: (i) Foreground process - Critical > >> > > priority; (ii) Visible process and Service process - High priority; > >> > > (iii) Background process and Empty process - Low priority; are three > >> > > scheduling classes ? > >> > > Thanks in advance, > >> > > Deborah > > >> > On Friday, March 16, 2012 6:38:57 AM UTC-7, Deborah wrote: > > >> > > I am trying to get a better understanding on ANDROID CFS. I have some > >> > > doubt on scheduler's behavior. > >> > > The difference between Android scheduler and Linux scheduler > >> > > Scheduler > >> > > — 5 files — The Android kernel also contains slight changes to the > >> > > CPU > >> > > process scheduler and time-keeping algorithms. We don’t know the > >> > > history of these changes, and the impact was not evident based on a > >> > > cursory examination. > >> > > Do you know which are this files? > >> > > If I understand, Process.THREAD_PRIORITY_DEFAULT or > >> > > Process.THREAD_PRIORITY_BACKGROUND are 'nice' value. How does Android > >> > > convert 'nice' value in 'timeslice'? > >> > > What is the initial value of 'virtual runtime' in Android and how to > >> > > calculate? > >> > > In Android, is 'cgroups' use to define scheduling classes? The > >> > > following application states: (i) Foreground process - Critical > >> > > priority; (ii) Visible process and Service process - High priority; > >> > > (iii) Background process and Empty process - Low priority; are three > >> > > scheduling classes ? > >> > > Thanks in advance, > >> > > Deborah > > > -- > > unsubscribe: [email protected] > > website:http://groups.google.com/group/android-kernel > > -- > Regards, > Gaggery
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