Hello there, Below snippet is taken from file: include/linux/sched.h >/* > * The load/runnable/util_avg accumulates an infinite geometric series > * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). > * > * [load_avg definition] > * > * load_avg = runnable% * scale_load_down(load) > * > * [runnable_avg definition] > * > * runnable_avg = runnable% * SCHED_CAPACITY_SCALE > * > * [util_avg definition] > * > * util_avg = running% * SCHED_CAPACITY_SCALE > * > * where runnable% is the time ratio that a sched_entity is runnable and > * running% the time ratio that a sched_entity is running. what's the denominator that's being considered here? Is it a period? or time between two scheduler ticks? > * > * For cfs_rq, they are the aggregated values of all runnable and blocked > * sched_entities. > * > * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU > * capacity scaling. The scaling is done through the rq_clock_pelt that is used > * for computing those signals (see update_rq_clock_pelt()) > * > * N.B., the above ratios (runnable% and running%) themselves are in the > * range of [0, 1]. To do fixed point arithmetics, we therefore scale them > * to as large a range as necessary. This is for example reflected by > * util_avg's SCHED_CAPACITY_SCALE. Thanks Vishal _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
