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Commit 0ec35511 authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: add preference for prev and sibling CPU in RT task placement 



Add a bias towards the RT task's previous CPU and sibling CPUs in order
to avoid cache bouncing and migrations.

CRs-fixed: 927903
Change-Id: I45d79d774e65efcb38282130b6692b4c3b03c2f0
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent c2e38a43

kernel/sched/rt.c

+5 −1
Original line number Diff line number Diff line
@@ -1651,6 +1651,7 @@ static int find_lowest_rq_hmp(struct task_struct *task) 
	int cpu_cost, min_cost = INT_MAX;

	u64 cpu_load, min_load = ULLONG_MAX;

	int best_cpu = -1;

	int prev_cpu = task_cpu(task);

	int i;



	/* Make sure the mask is initialized first */
@@ -1703,7 +1704,10 @@ static int find_lowest_rq_hmp(struct task_struct *task) 
		if (sched_cpu_high_irqload(i))

			continue;



		if (cpu_load < min_load) {

		if (cpu_load < min_load ||

		    (cpu_load == min_load &&

		     (i == prev_cpu || (best_cpu != prev_cpu &&

					cpus_share_cache(prev_cpu, i))))) {

			min_load = cpu_load;

			best_cpu = i;

		}