Mastering Linux Kernel Development

Scheduling entities under many-core systems

Task groups can in a many-core system run on any CPU core, but to facilitate this, creating only one scheduling entity will not suffice. Groups thus must create a scheduling entity for every CPU core on the system. Scheduling entities across CPUs are represented by struct task_group:

/* task group related information */struct task_group {       struct cgroup_subsys_state css;#ifdef CONFIG_FAIR_GROUP_SCHED /* schedulable entities of this group on each cpu */      struct sched_entity **se; /* runqueue "owned" by this group on each cpu */  struct cfs_rq **cfs_rq;   unsigned long shares;#ifdef CONFIG_SMP        /*         * load_avg can be heavily contended at clock tick time, so put * it in its own cacheline separated from the ...