Merge "sched: Take downmigrate threshold into consideration" (14b0b5bc) · Commits · e / devices / android_kernel_xiaomi_markw

Documentation/scheduler/sched-zone.txt

+12 −0

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		@@ -1268,6 +1268,18 @@ CPU across all clusters. When this tunable is enabled, the RT tasks are
		restricted to the lowest possible power cluster.


		*** 7.25 sched_downmigrate

		Appears at: /proc/sys/kernel/sched_downmigrate

		Default value: 60

		This tunable is a percentage. It exists to control hysteresis. Lets say a task
		migrated to a high-performance cpu when it crossed 80% demand on a
		power-efficient cpu. We don't let it come back to a power-efficient cpu until
		its demand in reference to the power-efficient cpu drops less than 60%
		(sched_downmigrate).

		=========================
		8. HMP SCHEDULER TRACE POINTS
		=========================

+7 −1

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		@@ -2739,13 +2739,19 @@ done:

		static int task_load_will_fit(struct task_struct *p, u64 task_load, int cpu)
		{
		int upmigrate;

		if (cpu_capacity(cpu) == max_capacity)
		return 1;

		if (task_nice(p) > sched_upmigrate_min_nice \|\| upmigrate_discouraged(p))
		return 1;

		if (task_load < sched_upmigrate)
		upmigrate = sched_upmigrate;
		if (cpu_capacity(task_cpu(p)) > cpu_capacity(cpu))
		upmigrate = sched_downmigrate;

		if (task_load < upmigrate)
		return 1;

		return 0;