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 <gkas...@android.com> 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: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
