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evie/android_kernel_oneplus_msm8998

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sched/{fair,tune}: track RUNNABLE tasks impact on per CPU boost value When per-task boosting is enabled, every time a task enters/exits a CPU its boost value could impact the currently selected OPP for that CPU. Thus, the "aggregated" boost value for that CPU potentially needs to be updated to match the current maximum boost value among all the tasks currently RUNNABLE on that CPU. This patch introduces the required support to keep track of which boost groups are impacting a CPU. Each time a task is enqueued/dequeued to/from a CPU its boost group is used to increment a per-cpu counter of RUNNABLE tasks on that CPU. Only when the number of runnable tasks for a specific boost group becomes 1 or 0 the corresponding boost group changes its effects on that CPU, specifically: a) boost_group::tasks == 1: this boost group starts to impact the CPU b) boost_group::tasks == 0: this boost group stops to impact the CPU In each of these two conditions the aggregation function: sched_cpu_update(cpu) could be required to run in order to identify the new maximum boost value required for the CPU. The proposed patch minimizes the number of times the aggregation function is executed while still providing the required support to always boost a CPU to the maximum boost value required by all its currently RUNNABLE tasks. cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> 2015-07-07 15:33:20 +01:00
			`#ifdef CONFIG_SCHED_TUNE`

			`#ifdef CONFIG_CGROUP_SCHEDTUNE`

			`int schedtune_cpu_boost(int cpu);`

			`void schedtune_enqueue_task(struct task_struct *p, int cpu);`
			`void schedtune_dequeue_task(struct task_struct *p, int cpu);`

			`#else /* CONFIG_CGROUP_SCHEDTUNE */`

			`#define schedtune_enqueue_task(task, cpu) do { } while (0)`
			`#define schedtune_dequeue_task(task, cpu) do { } while (0)`

			`#endif /* CONFIG_CGROUP_SCHEDTUNE */`

			`#else /* CONFIG_SCHED_TUNE */`

			`#define schedtune_enqueue_task(task, cpu) do { } while (0)`
			`#define schedtune_dequeue_task(task, cpu) do { } while (0)`

			`#endif /* CONFIG_SCHED_TUNE */`