priorities.h

#define PRI_MIN_TIMESHARE       (88)
#define PRI_MAX_TIMESHARE       (223)
#define PRI_TIMESHARE_RANGE     (PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE + 1) // 136

#define PRI_INTERACT_RANGE      ((PRI_TIMESHARE_RANGE - SCHED_PRI_NRESV) / 2) // 48
#define PRI_BATCH_RANGE         (PRI_TIMESHARE_RANGE - PRI_INTERACT_RANGE) // 88

#define PRI_MIN_INTERACT        PRI_MIN_TIMESHARE // 88
#define PRI_MAX_INTERACT        (PRI_MIN_TIMESHARE + PRI_INTERACT_RANGE - 1) // 135

#define PRI_MIN_BATCH           (PRI_MIN_TIMESHARE + PRI_INTERACT_RANGE) //136
#define PRI_MAX_BATCH           PRI_MAX_TIMESHARE // 223

#define MIN_NICENESS     (-20)
#define MAX_NICENESS     (20)
#define DEFAULT_NICENESS (0)

#define SCHED_PRI_NRESV (MAX_NICENESS - MIN_NICENESS) // 40
#define SCHED_PRI_NHALF (SCHED_PRI_NRESV / 2) // 20

#define SCHED_PRI_MIN   (PRI_MIN_BATCH + SCHED_PRI_NHALF) // 156
#define SCHED_PRI_MAX   (PRI_MAX_BATCH - SCHED_PRI_NHALF) // 203
#define SCHED_PRI_RANGE (SCHED_PRI_MAX - SCHED_PRI_MIN + 1) // 48

#define SCHED_INTERACT_MIN      (0)
#define SCHED_INTERACT_MAX      (100)
#define SCHED_INTERACT_HALF     (SCHED_INTERACT_MAX / 2)
#define SCHED_INTERACT_THRESH   (30)

#define roundup(x, y)           ((((x) + ((y) - 1)) / (y)) * (y))

#define hz                                   (std::chrono::steady_clock::period::den / std::chrono::steady_clock::period::num)
#define SCHED_TICK_SECS                      (10)
#define SCHED_TICK_TARG                      (hz * SCHED_TICK_SECS)
#define SCHED_TICK_MAX                       (SCHED_TICK_TARG + hz)
#define SCHED_TICK_SHIFT                     (10)
#define SCHED_TICK_HZ(ticks)                 (ticks >> SCHED_TICK_SHIFT)
#define SCHED_TICK_TOTAL(ltick, ftick)       ((ltick - ftick > hz) ? (ltick - ftick) : hz)
#define SCHED_PRI_TICKS(ticks, ltick, ftick) (SCHED_TICK_HZ(ticks) / (roundup(SCHED_TICK_TOTAL(ltick, ftick), SCHED_PRI_RANGE) / SCHED_PRI_RANGE))