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-
-
-Real-Time group scheduling.
-
-The problem space:
-
-In order to schedule multiple groups of realtime tasks each group must
-be assigned a fixed portion of the CPU time available. Without a minimum
-guarantee a realtime group can obviously fall short. A fuzzy upper limit
-is of no use since it cannot be relied upon. Which leaves us with just
-the single fixed portion.
-
-CPU time is divided by means of specifying how much time can be spent
-running in a given period. Say a frame fixed realtime renderer must
-deliver 25 frames a second, which yields a period of 0.04s. Now say
-it will also have to play some music and respond to input, leaving it
-with around 80% for the graphics. We can then give this group a runtime
-of 0.8 * 0.04s = 0.032s.
-
-This way the graphics group will have a 0.04s period with a 0.032s runtime
-limit.
-
-Now if the audio thread needs to refill the DMA buffer every 0.005s, but
-needs only about 3% CPU time to do so, it can do with a 0.03 * 0.005s
-= 0.00015s.
-
-
-The Interface:
-
-system wide:
-
-/proc/sys/kernel/sched_rt_period_ms
-/proc/sys/kernel/sched_rt_runtime_us
-
-CONFIG_FAIR_USER_SCHED
-
-/sys/kernel/uids/<uid>/cpu_rt_runtime_us
-
-or
-
-CONFIG_FAIR_CGROUP_SCHED
-
-/cgroup/<cgroup>/cpu.rt_runtime_us
-
-[ time is specified in us because the interface is s32; this gives an
-  operating range of ~35m to 1us ]
-
-The period takes values in [ 1, INT_MAX ], runtime in [ -1, INT_MAX - 1 ].
-
-A runtime of -1 specifies runtime == period, ie. no limit.
-
-New groups get the period from /proc/sys/kernel/sched_rt_period_us and
-a runtime of 0.
-
-Settings are constrained to:
-
-   \Sum_{i} runtime_{i} / global_period <= global_runtime / global_period
-
-in order to keep the configuration schedulable.