As far as I understand, __sched_period is the time incurred in making the task
runnable again(the period making sure each process have a chance to run). When
the processes are less than sched_nr_latency, the CFS scheduler splits time
into periods in which each process is anticipated to run once.
u64 __sched_period(unsigned long nr_running)
{
if (unlikely(nr_running > sched_nr_latency))
return nr_running * sysctl_sched_min_granularity;
else
return sysctl_sched_latency;
}
1. Does each process have a maximum of 'sysctl_sched_latency/2' time to run
or do we have to perform 'sysctl_sched_latency/2' for each process if we have
two processes with the same weight?
2. What about context switching time, scheduler cost calculation, and other
factors? What does the sched_period consist of? What is the meaning of
sched_period?
More details here:
https://stackoverflow.com/questions/71480711/how-to-understand-sched-period-in-the-cfs-schedule-class
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