sched/fair: Use CPU original capacity for max capacity CPU check (b3d3f38e) · Commits · e / devices / android_kernel_oneplus_sm8150

task_fits_max() checks if a task fits on a given CPU or not. Any task can fit on the max capacity CPU. so task_fits_max() should return true when called on a max capacity CPU. However the check inside this funciton uses CPU capacity instead of original capacity when comparing against max capacity. The CPU capacity can be lower than the original capacity for a max capacity CPU due to RT tasks. In such cases, we fail to upmigrate to the max capacity CPU. Change-Id: I9f3c14b91d9a6d8a61bbd3a1fe7a8f4aa7415987 Signed-off-by:

Pavankumar Kondeti <pkondeti@codeaurora.org>

kernel/sched/fair.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -6945,7 +6945,7 @@ static inline int task_fits_capacity(struct task_struct *p,

		static inline bool task_fits_max(struct task_struct *p, int cpu)
		{
		unsigned long capacity = capacity_of(cpu);
		unsigned long capacity = capacity_orig_of(cpu);
		unsigned long max_capacity = cpu_rq(cpu)->rd->max_cpu_capacity;

		if (capacity == max_capacity)
		@@ -7964,7 +7964,8 @@ static void check_preempt_wakeup(struct rq rq, struct task_struct p, int wake_
		static inline void update_misfit_task(struct rq rq, struct task_struct p)
		{
		#ifdef CONFIG_SMP
		rq->misfit_task = !task_fits_capacity(p, capacity_of(rq->cpu), rq->cpu);
		rq->misfit_task = !task_fits_capacity(p, capacity_orig_of(rq->cpu),
		rq->cpu);
		#endif
		}