I'm looking for the value of the time slice (or quantum) of my Linux kernel.
Is there a
The default Linux timeslice for realtime processes is defined in the Linux kernel as
RR_TIMESLICE in include/linux/sched/rt.h.
/* * default timeslice is 100 msecs (used only for SCHED_RR tasks). * Timeslices get refilled after they expire. */ #define RR_TIMESLICE (100 * HZ / 1000)
Note that the actual quantum allocated for a particular process may be different than this value:
You can tune "slice" by adjusting sched_latency_ns and sched_min_granularity_ns, but note that "slice" is not a fixed quantum. Also note that CFS preemption decisions are based upon instantaneous state. A task may have received a full (variable) "slice" of CPU time, but preemption will be triggered only if a more deserving task is available, so a "slice" is not the "max uninterrupted CPU time" that you may expect it to be.. but it is somewhat similar.
However, you can use
sched_rr_get_interval() to get the SCHED_RR interval for a given realtime process.