On Tue, Feb 28, 2017 at 6:38 AM, Patrick Bellasi <patrick.bell...@arm.com> wrote: > The CPU CGroup controller allows to assign a specified (maximum) > bandwidth to tasks within a group, however it does not enforce any > constraint on how such bandwidth can be consumed. > With the integration of schedutil, the scheduler has now the proper > information about a task to select the most suitable frequency to > satisfy tasks needs. [..]
> +static u64 cpu_capacity_min_read_u64(struct cgroup_subsys_state *css, > + struct cftype *cft) > +{ > + struct task_group *tg; > + u64 min_capacity; > + > + rcu_read_lock(); > + tg = css_tg(css); > + min_capacity = tg->cap_clamp[CAP_CLAMP_MIN]; Shouldn't the cap_clamp be accessed with READ_ONCE (and WRITE_ONCE in the write path) to avoid load-tearing? Thanks, Joel