Tianchen Ding 5a4f8de92d sched/fair: Make SCHED_IDLE entity be preempted in strict hierarchy ...

[ Upstream commit faa42d2941 ]

Consider the following cgroup:

                       root
                        |
             ------------------------
             |                      |
       normal_cgroup            idle_cgroup
             |                      |
   SCHED_IDLE task_A           SCHED_NORMAL task_B

According to the cgroup hierarchy, A should preempt B. But current
check_preempt_wakeup_fair() treats cgroup se and task separately, so B
will preempt A unexpectedly.
Unify the wakeup logic by {c,p}se_is_idle only. This makes SCHED_IDLE of
a task a relative policy that is effective only within its own cgroup,
similar to the behavior of NICE.

Also fix se_is_idle() definition when !CONFIG_FAIR_GROUP_SCHED.

Fixes: 304000390f ("sched: Cgroup SCHED_IDLE support")
Signed-off-by: Tianchen Ding <dtcccc@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Don <joshdon@google.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20240626023505.1332596-1-dtcccc@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-10-04 16:29:14 +02:00

..

autogroup.c

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autogroup.h

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build_policy.c

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build_utility.c

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clock.c

Merge tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2023-06-27 14:14:30 -07:00

completion.c

sched: add a few helpers to wake up tasks on the current cpu

2023-07-17 16:08:08 -07:00

core_sched.c

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core.c

membarrier: riscv: Add full memory barrier in switch_mm()

2024-09-12 11:11:45 +02:00

cpuacct.c

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cpudeadline.c

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cpudeadline.h

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cpufreq_schedutil.c

cpufreq: schedutil: Update next_freq when cpufreq_limits change

2023-10-05 22:09:50 +02:00

cpufreq.c

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cpupri.c

sched/rt: Fix live lock between select_fallback_rq() and RT push

2023-09-28 22:58:13 +02:00

cpupri.h

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cputime.c

sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime

2024-08-14 13:58:47 +02:00

deadline.c

sched: Fix stop_one_cpu_nowait() vs hotplug

2023-11-20 11:58:52 +01:00

debug.c

sched/debug: Rename sysctl_sched_min_granularity to sysctl_sched_base_slice

2023-07-19 09:43:59 +02:00

fair.c

sched/fair: Make SCHED_IDLE entity be preempted in strict hierarchy

2024-10-04 16:29:14 +02:00

features.h

sched/eevdf: Curb wakeup-preemption

2023-08-17 17:07:07 +02:00

idle.c

kernel/sched: Modify initial boot task idle setup

2023-09-19 10:48:04 +02:00

isolation.c

sched/isolation: Fix boot crash when maxcpus < first housekeeping CPU

2024-06-12 11:11:24 +02:00

loadavg.c

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Makefile

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membarrier.c

sched/membarrier: reduce the ability to hammer on sys_membarrier

2024-02-23 09:25:27 +01:00

pelt.c

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pelt.h

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psi.c

sched: Move psi_account_irqtime() out of update_rq_clock_task() hotpath

2024-07-18 13:21:25 +02:00

rt.c

sched/rt: Disallow writing invalid values to sched_rt_period_us

2024-03-01 13:34:47 +01:00

sched-pelt.h

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sched.h

sched/fair: set_load_weight() must also call reweight_task() for SCHED_IDLE tasks

2024-08-03 08:54:14 +02:00

smp.h

sched, smp: Trace smp callback causing an IPI

2023-03-24 11:01:29 +01:00

stats.c

profiling: remove profile=sleep support

2024-08-14 13:58:47 +02:00

stats.h

sched: Move psi_account_irqtime() out of update_rq_clock_task() hotpath

2024-07-18 13:21:25 +02:00

stop_task.c

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swait.c

sched: add a few helpers to wake up tasks on the current cpu

2023-07-17 16:08:08 -07:00

topology.c

sched/topology: Handle NUMA_NO_NODE in sched_numa_find_nth_cpu()

2024-08-29 17:33:24 +02:00

wait_bit.c

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wait.c

sched: add a few helpers to wake up tasks on the current cpu

2023-07-17 16:08:08 -07:00