Peter Zijlstra 14a8570564 sched/deadline: Use revised wakeup rule for dl_server ...

John noted that commit 1151354225 ("sched/deadline: Fix 'stuck' dl_server")
unfixed the issue from commit a3a70caf79 ("sched/deadline: Fix dl_server
behaviour").

The issue in commit 1151354225 was for wakeups of the server after the
deadline; in which case you *have* to start a new period. The case for
a3a70caf79 is wakeups before the deadline.

Now, because the server is effectively running a least-laxity policy, it means
that any wakeup during the runnable phase means dl_entity_overflow() will be
true. This means we need to adjust the runtime to allow it to still run until
the existing deadline expires.

Use the revised wakeup rule for dl_defer entities.

Fixes: 1151354225 ("sched/deadline: Fix 'stuck' dl_server")
Reported-by: John Stultz <jstultz@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Tested-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260404102244.GB22575@noisy.programming.kicks-ass.net

2026-04-08 13:11:43 +02:00

..

autogroup.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

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/clock: Avoid false sharing for sched_clock_irqtime

2026-02-03 12:04:19 +01:00

completion.c

sched: Make clangd usable

2025-06-11 11:20:53 +02:00

core_sched.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

core.c

sched/mmcid: Avoid full tasklist walks

2026-03-11 12:01:07 +01:00

cpuacct.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

cpudeadline.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

cpudeadline.h

sched/deadline: only set free_cpus for online runqueues

2025-10-16 11:13:49 +02:00

cpufreq_schedutil.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

cpufreq.c

sched: Make clangd usable

2025-06-11 11:20:53 +02:00

cpupri.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

cpupri.h

sched/smp: Make SMP unconditional

2025-06-13 08:47:18 +02:00

cputime.c

Merge tag 'x86_paravirt_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-02-10 19:01:45 -08:00

deadline.c

sched/deadline: Use revised wakeup rule for dl_server

2026-04-08 13:11:43 +02:00

debug.c

sched/debug: Fix avg_vruntime() usage

2026-04-02 13:42:43 +02:00

ext_idle.c

sched_ext: Fix is_bpf_migration_disabled() false negative on non-PREEMPT_RCU

2026-04-02 09:26:55 -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: Document task ownership state machine

2026-03-05 06:21:06 -10:00

ext.c

sched_ext: Fix stale direct dispatch state in ddsp_dsq_id

2026-04-03 07:14:49 -10:00

ext.h

sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations

2025-09-03 11:36:07 -10:00

fair.c

sched/fair: Fix zero_vruntime tracking fix

2026-04-02 13:42:43 +02:00

features.h

sched/fair: Disable scheduler feature NEXT_BUDDY

2026-01-23 11:53:19 +01:00

idle.c

sched: idle: Consolidate the handling of two special cases

2026-03-16 20:29:47 +01:00

isolation.c

cgroup/cpuset: Call housekeeping_update() without holding cpus_read_lock

2026-02-23 10:46:49 -10:00

loadavg.c

Merge branch 'tip/sched/urgent'

2025-07-14 17:16:28 +02:00

Makefile

sched: Enable context analysis for core.c and fair.c

2026-01-05 16:43:36 +01:00

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

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

rq-offsets.c

sched: Make migrate_{en,dis}able() inline

2025-09-25 09:57:16 +02:00

rt.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

sched-pelt.h

sched: Make clangd usable

2025-06-11 11:20:53 +02:00

sched.h

sched_ext: Fix SCX_KICK_WAIT deadlock by deferring wait to balance callback

2026-03-30 08:37:27 -10:00

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

delayacct: add timestamp of delay max

2026-01-31 16:16:06 -08:00

stop_task.c

sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()

2025-12-17 10:53:25 +01:00

swait.c

sched: Make clangd usable

2025-06-11 11:20:53 +02:00

syscalls.c

sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting

2026-03-04 17:06:08 +01:00

topology.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

wait_bit.c

sched: Make clangd usable

2025-06-11 11:20:53 +02:00

wait.c

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2025-07-30 17:14:01 -07:00