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| author |   Qais Yousef <qais.yousef@arm.com> | 2020-03-02 13:27:19 +0000 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-03-06 12:57:28 +0100 |
| commit | 98ca645f824301bde72e0a51cdc8bdbbea6774a5 (patch) | |
| tree | e9777780f3c457a6ef1a703c34ce4859f58de589 /kernel/sched | |
| parent | sched/rt: Optimize cpupri_find() on non-heterogenous systems (diff) | |
| download | linux-dev-98ca645f824301bde72e0a51cdc8bdbbea6774a5.tar.xz linux-dev-98ca645f824301bde72e0a51cdc8bdbbea6774a5.zip | |
sched/rt: Allow pulling unfitting task
When implemented RT Capacity Awareness; the logic was done such that if
a task was running on a fitting CPU, then it was sticky and we would try
our best to keep it there.
But as Steve suggested, to adhere to the strict priority rules of RT
class; allow pulling an RT task to unfitting CPU to ensure it gets a
chance to run ASAP.
LINK: https://lore.kernel.org/lkml/20200203111451.0d1da58f@oasis.local.home/
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Fixes: 804d402fb6f6 ("sched/rt: Make RT capacity-aware")
Link: https://lkml.kernel.org/r/20200302132721.8353-5-qais.yousef@arm.com
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/rt.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 29a86959bda4..bcb143661a86 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1656,8 +1656,7 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p) static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu) { if (!task_running(rq, p) && - cpumask_test_cpu(cpu, p->cpus_ptr) && - rt_task_fits_capacity(p, cpu)) + cpumask_test_cpu(cpu, p->cpus_ptr)) return 1; return 0; |