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SubjectRe: [Patch 4/4] sched: Improve fairness of cpu bandwidth allocation for task groups

* Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> wrote:

> +static inline void lock_doms_cur(void)
> +{
> + mutex_lock(&doms_cur_mutex);
> +}
> +
> +static inline void unlock_doms_cur(void)
> +{
> + mutex_unlock(&doms_cur_mutex);
> +}
> +
> #else
>
> static inline void set_task_cfs_rq(struct task_struct *p, unsigned int cpu) { }
> static inline void lock_task_group_list(void) { }
> static inline void unlock_task_group_list(void) { }
> +static inline void lock_doms_cur(void) { }
> +static inline void unlock_doms_cur(void) { }
>
> #endif /* CONFIG_FAIR_GROUP_SCHED */
>
> @@ -6546,6 +6605,8 @@
> {
> int i, j;
>
> + lock_doms_cur();
> +
> /* always unregister in case we don't destroy any domains */
> unregister_sched_domain_sysctl();
>
> @@ -6586,6 +6647,8 @@
> ndoms_cur = ndoms_new;
>
> register_sched_domain_sysctl();
> +
> + unlock_doms_cur();
> }

this API and locking should be introduced in a separate patch first, to
reduce the size and impact of the 4/4 patch.

Ingo
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