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UPSTREAM: sched/rt: Allow pulling unfitting task

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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.

Bug: 120440300
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
(cherry picked from commit 98ca645f824301bde72e0a51cdc8bdbbea6774a5)
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Change-Id: Ifa1b1529690e190c7ad209643fb70532d8c3b492
This commit is contained in:
Qais Yousef 2020-03-02 13:27:19 +00:00
parent e1c68ebed9
commit 063d4fb3fd
1 changed files with 1 additions and 2 deletions
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3
kernel/sched/rt.c
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@ -1659,8 +1659,7 @@ 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;