Merge "core_ctl: Isolate not_preferred CPUs first during max_cpus limiting" (4c5f049b) · Commits · e / devices / android_kernel_fairphone_FP3

kernel/sched/core_ctl.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -789,6 +789,7 @@ static void try_to_isolate(struct cluster_data *cluster, unsigned int need)
		unsigned long flags;
		unsigned int num_cpus = cluster->num_cpus;
		unsigned int nr_isolated = 0;
		bool first_pass = cluster->nr_not_preferred_cpus;

		/*
		* Protect against entry being removed (and added at tail) by other
		@@ -834,6 +835,7 @@ static void try_to_isolate(struct cluster_data *cluster, unsigned int need)
		cluster->nr_isolated_cpus += nr_isolated;
		spin_unlock_irqrestore(&state_lock, flags);

		again:
		/*
		* If the number of active CPUs is within the limits, then
		* don't force isolation of any busy CPUs.
		@@ -853,6 +855,9 @@ static void try_to_isolate(struct cluster_data *cluster, unsigned int need)
		if (cluster->active_cpus <= cluster->max_cpus)
		break;

		if (first_pass && !c->not_preferred)
		continue;

		spin_unlock_irqrestore(&state_lock, flags);

		pr_debug("Trying to isolate CPU%u\n", c->cpu);
		@@ -869,6 +874,10 @@ static void try_to_isolate(struct cluster_data *cluster, unsigned int need)
		cluster->nr_isolated_cpus += nr_isolated;
		spin_unlock_irqrestore(&state_lock, flags);

		if (first_pass && cluster->active_cpus > cluster->max_cpus) {
		first_pass = false;
		goto again;
		}
		}

		static void __try_to_unisolate(struct cluster_data *cluster,