diff options
| author | Joonwoo Park <joonwoop@codeaurora.org> | 2015-10-20 18:21:35 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 20:02:36 -0700 |
| commit | 0254e508432c631a00905a13fc5490067646d406 (patch) | |
| tree | ae3ef34c7246624a2dc801f06bbfdd8f05b5cfa8 /kernel | |
| parent | dba1a27b5a1e585a5292a150926b39137035deff (diff) | |
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: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/rt.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 82b4052b621b..f0f3cf71c538 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1667,6 +1667,7 @@ 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 */ @@ -1709,7 +1710,10 @@ 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; } |