Vineeth Pillai 8039e96fcc sched/fair: Fix forced idle sibling starvation corner case ...

If there is only one long running local task and the sibling is
forced idle, it  might not get a chance to run until a schedule
event happens on any cpu in the core.

So we check for this condition during a tick to see if a sibling
is starved and then give it a chance to schedule.

Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Don Hiatt <dhiatt@digitalocean.com>
Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210422123308.617407840@infradead.org

2021-05-12 11:43:29 +02:00

..

autogroup.c

sched/autogroup: Make autogroup_path() always available

2019-06-24 19:23:40 +02:00

autogroup.h

…

clock.c

sched: Fix various typos

2021-03-22 00:11:52 +01:00

completion.c

completion: Use lockdep_assert_RT_in_threaded_ctx() in complete_all()

2020-03-23 18:40:25 +01:00

core.c

sched/fair: Fix forced idle sibling starvation corner case

2021-05-12 11:43:29 +02:00

cpuacct.c

sched: Wrap rq::lock access

2021-05-12 11:43:26 +02:00

cpudeadline.c

sched,rt: Use the full cpumask for balancing

2020-11-10 18:39:00 +01:00

cpudeadline.h

…

cpufreq_schedutil.c

Merge tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-04-28 13:33:57 -07:00

cpufreq.c

cpufreq: Avoid leaving stale IRQ work items during CPU offline

2019-12-12 17:59:43 +01:00

cpupri.c

sched: Fix various typos

2021-03-22 00:11:52 +01:00

cpupri.h

sched/cpupri: Add CPUPRI_HIGHER

2020-10-29 11:00:30 +01:00

cputime.c

Merge tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-04-28 13:33:57 -07:00

deadline.c

sched: Introduce sched_class::pick_task()

2021-05-12 11:43:28 +02:00

debug.c

sched: Wrap rq::lock access

2021-05-12 11:43:26 +02:00

fair.c

sched/fair: Fix forced idle sibling starvation corner case

2021-05-12 11:43:29 +02:00

features.h

sched: Warn on long periods of pending need_resched

2021-04-21 13:55:41 +02:00

idle.c

sched: Introduce sched_class::pick_task()

2021-05-12 11:43:28 +02:00

isolation.c

isolcpus: Affine unbound kernel threads to housekeeping cpus

2020-06-15 14:10:03 +02:00

loadavg.c

sched: Fix various typos

2021-03-22 00:11:52 +01:00

Makefile

kcsan: Improve various small stylistic details

2019-11-20 10:47:23 +01:00

membarrier.c

sched/membarrier: fix missing local execution of ipi_sync_rq_state()

2021-03-06 12:40:21 +01:00

pelt.c

sched: Fix various typos

2021-03-22 00:11:52 +01:00

pelt.h

sched: Wrap rq::lock access

2021-05-12 11:43:26 +02:00

psi.c

psi: Fix psi state corruption when schedule() races with cgroup move

2021-05-06 15:33:26 +02:00

rt.c

sched: Introduce sched_class::pick_task()

2021-05-12 11:43:28 +02:00

sched-pelt.h

sched/fair: Fix "runnable_avg_yN_inv" not used warnings

2019-06-17 12:15:58 +02:00

sched.h

sched/fair: Fix forced idle sibling starvation corner case

2021-05-12 11:43:29 +02:00

smp.h

sched/headers: Split out open-coded prototypes into kernel/sched/smp.h

2020-05-28 11:03:20 +02:00

stats.c

sched: Fix various typos

2021-03-22 00:11:52 +01:00

stats.h

sched: Simplify sched_info_on()

2021-05-12 11:43:24 +02:00

stop_task.c

sched: Introduce sched_class::pick_task()

2021-05-12 11:43:28 +02:00

swait.c

sched/swait: Prepare usage in completions

2020-03-21 16:00:23 +01:00

topology.c

sched: Wrap rq::lock access

2021-05-12 11:43:26 +02:00

wait_bit.c

sched/wait: fix ___wait_var_event(exclusive)

2019-12-17 13:32:50 +01:00

wait.c

sched/wait: Add add_wait_queue_priority()

2020-11-15 09:49:09 -05:00