Thanks, but maybe the only solution is to read the source code!!!
Regards,
Deborah

On Mar 20, 2:43 am, Glenn Kasten <gkas...@android.com> wrote:
> 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 <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

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