October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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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 ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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