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linux/kernel/sched
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Peter Zijlstra 1151354225 sched/deadline: Fix 'stuck' dl_server 
Andrea reported the dl_server getting stuck for him. He tracked it
down to a state where dl_server_start() saw dl_defer_running==1, but
the dl_server's job is no longer valid at the time of
dl_server_start().

In the state diagram this corresponds to [4] D->A (or dl_server_stop()
due to no more runnable tasks) followed by [1], which in case of a
lapsed deadline must then be A->B.

Now our A has dl_defer_running==1, while B demands
dl_defer_running==0, therefore it must get cleared when the CBS wakeup
rules demand a replenish.

Fixes: a110a81c52 ("sched/deadline: Deferrable dl server")
Reported-by: Andrea Righi arighi@nvidia.com
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Tested-by: Andrea Righi arighi@nvidia.com
Link: https://lkml.kernel.org/r/20260123161645.2181752-1-arighi@nvidia.com
Link: https://patch.msgid.link/20260130124100.GC1079264@noisy.programming.kicks-ass.net
 		2026-01-30 23:06:06 +01:00
..
Makefile tracing: Disable branch profiling in noinstr code 2025-03-22 09:49:26 +01:00
autogroup.c cgroup: Rename cgroup lifecycle hooks to cgroup_task_*() 2025-11-03 11:46:18 -10:00
autogroup.h sched: Clean up and standardize #if/#else/#endif markers in sched/autogroup.[ch] 2025-06-13 08:47:14 +02:00
build_policy.c sched_ext: Move internal type and accessor definitions to ext_internal.h 2025-09-03 11:33:28 -10:00
build_utility.c sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
clock.c sched: Clean up and standardize #if/#else/#endif markers in sched/clock.c 2025-06-13 08:47:14 +02:00
completion.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core.c sched: Deadline has dynamic priority 2026-01-15 21:57:53 +01:00
core_sched.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpuacct.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpudeadline.c sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpudeadline.h sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpufreq.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpufreq_schedutil.c sched: Clean up and standardize #if/#else/#endif markers in sched/cpufreq_schedutil.c 2025-06-13 08:47:15 +02:00
cpupri.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpupri.h sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
cputime.c seqlock: Change thread_group_cputime() to use scoped_seqlock_read() 2025-10-21 12:31:57 +02:00
deadline.c sched/deadline: Fix 'stuck' dl_server 2026-01-30 23:06:06 +01:00
debug.c sched/eevdf: Fix min_vruntime vs avg_vruntime 2025-11-11 12:33:38 +01:00
ext.c sched: Audit MOVE vs balance_callbacks 2026-01-15 21:57:53 +01:00
ext.h sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations 2025-09-03 11:36:07 -10:00
ext_idle.c sched_ext: Wrap kfunc args in struct to prepare for aux__prog 2025-10-13 08:49:29 -10:00
ext_idle.h sched_ext: Always use SMP versions in kernel/sched/ext_idle.h 2025-06-13 14:47:59 -10:00
ext_internal.h sched_ext: Implement load balancer for bypass mode 2025-11-12 06:43:44 -10:00
fair.c sched/fair: Revert force wakeup preemption 2026-01-23 11:53:20 +01:00
features.h sched/fair: Disable scheduler feature NEXT_BUDDY 2026-01-23 11:53:19 +01:00
idle.c sched/fair: Fix pelt clock sync when entering idle 2026-01-21 17:46:08 +01:00
isolation.c sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any 2025-11-20 20:17:31 +01:00
loadavg.c Merge branch 'tip/sched/urgent' 2025-07-14 17:16:28 +02:00
membarrier.c rseq: Simplify the event notification 2025-11-04 08:30:09 +01:00
pelt.c treewide: Update email address 2026-01-11 06:09:11 -10:00
pelt.h sched/fair: Switch to task based throttle model 2025-09-03 10:03:14 +02:00
psi.c sched/psi: Fix psi_seq initialization 2025-08-04 10:51:22 -07:00
rq-offsets.c sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
rt.c sched/proxy: Yield the donor task 2025-11-11 12:33:36 +01:00
sched-pelt.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
sched.h sched: Audit MOVE vs balance_callbacks 2026-01-15 21:57:53 +01:00
smp.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
stats.c sched/smp: Use the SMP version of schedstats 2025-06-13 08:47:21 +02:00
stats.h sched/core: Fix psi_dequeue() for Proxy Execution 2025-12-06 10:13:16 +01:00
stop_task.c sched: Add support to pick functions to take rf 2025-10-16 11:13:55 +02:00
swait.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
syscalls.c sched: Deadline has dynamic priority 2026-01-15 21:57:53 +01:00
topology.c sched/fair: Proportional newidle balance 2025-11-17 17:13:16 +01:00
wait.c ARM: 2025-07-30 17:14:01 -07:00
wait_bit.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00