Commit c6c7b25f authored Nov 21, 2018 by Pavankumar Kondeti

sched/fair: Add overutilization condition to sync wakeup case



Don't wake the sync wakee on the waker CPU if the CPU becomes
overutilized after adding the waking task load to its load.
Ideally the waker task load should be subtracted before checking
for the overutilization condition, but it is not done to cover the
cases where the wakee task continue to run after the sync wakeup.

Change-Id: Ic17cc79dca2cfb6bd2055aa6544464f1d6df6fcd
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

parent 3dbf25d8

kernel/sched/fair.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -7350,7 +7350,7 @@ bias_to_waker_cpu(struct task_struct p, int cpu, struct cpumask rtg_target)
		return cpumask_test_cpu(cpu, tsk_cpus_allowed(p)) &&
		cpu_active(cpu) && !cpu_isolated(cpu) &&
		capacity_orig_of(cpu) >= capacity_orig_of(rtg_target_cpu) &&
		task_fits_max(p, cpu);
		task_fits_max(p, cpu) && !__cpu_overutilized(cpu, task_util(p));
		}

		#define SCHED_SELECT_PREV_CPU_NSEC 2000000