October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Real-time group scheduling
Similar to group scheduling under CFS, real-time processes can also be grouped for scheduling with CONFIG_RT_GROUP_SCHED set. For group scheduling to succeed, each group must be assigned a portion of CPU time, with a guarantee that the timeslice is enough to run the tasks under each entity, or it fails. So "run time" (a portion of how much time a CPU can spend running in a period) is allocated per group. The run time allocated to one group will not be used by another group. CPU time that is not allocated for real-time groups will be used by normal-priority tasks and any time unused by the real-time entities will also be picked by the normal tasks. FIFO and RR groups are represented by struct sched_rt_entity:
struct ...