linux.git/tools/testing/selftests/sched_ext, branch v6.16

selftests/sched_ext: Fix exit selftest hang on UP

2025-07-03T16:44:13+00:00

On single-CPU systems, ops.select_cpu() is never called, causing the
EXIT_SELECT_CPU test case to wait indefinitely.

Avoid the stall by skipping this specific sub-test when only one CPU is
available.

Reported-by: Phil Auld 
Fixes: a5db7817af780 ("sched_ext: Add selftests")
Signed-off-by: Andrea Righi 
Reviewed-by: Phil Auld 
Tested-by: Phil Auld 
Signed-off-by: Tejun Heo

selftests/sched_ext: Update test enq_select_cpu_fails

2025-05-21T17:35:58+00:00

With commit 08699d20467b6 ("sched_ext: idle: Consolidate default idle
CPU selection kfuncs") allowing scx_bpf_select_cpu_dfl() to be invoked
from multiple contexts, update the test to validate that the kfunc
behaves correctly when used from ops.enqueue() and via BPF test_run.

Additionally, rename the test to enq_select_cpu, dropping "fails" from
the name, as the logic has now been inverted.

Signed-off-by: Andrea Righi 
Signed-off-by: Tejun Heo

selftests/sched_ext: Add test for scx_bpf_select_cpu_and() via test_run

2025-05-20T20:24:17+00:00

Update the allowed_cpus selftest to include a check to validate the
behavior of scx_bpf_select_cpu_and() when invoked via a BPF test_run
call.

Signed-off-by: Andrea Righi 
Signed-off-by: Tejun Heo

selftests/sched_ext: Add test for scx_bpf_select_cpu_and()

2025-04-07T17:13:52+00:00

Add a selftest to validate the behavior of the built-in idle CPU
selection policy applied to a subset of allowed CPUs, using
scx_bpf_select_cpu_and().

Signed-off-by: Andrea Righi 
Signed-off-by: Tejun Heo

Merge tag 'sched-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-03-25T04:28:12+00:00

Pull scheduler updates from Ingo Molnar:
 "Core & fair scheduler changes:

   - Cancel the slice protection of the idle entity (Zihan Zhou)
   - Reduce the default slice to avoid tasks getting an extra tick
     (Zihan Zhou)
   - Force propagating min_slice of cfs_rq when {en,de}queue tasks
     (Tianchen Ding)
   - Refactor can_migrate_task() to elimate looping (I Hsin Cheng)
   - Add unlikey branch hints to several system calls (Colin Ian King)
   - Optimize current_clr_polling() on certain architectures (Yujun
     Dong)

  Deadline scheduler: (Juri Lelli)
   - Remove redundant dl_clear_root_domain call
   - Move dl_rebuild_rd_accounting to cpuset.h

  Uclamp:
   - Use the uclamp_is_used() helper instead of open-coding it (Xuewen
     Yan)
   - Optimize sched_uclamp_used static key enabling (Xuewen Yan)

  Scheduler topology support: (Juri Lelli)
   - Ignore special tasks when rebuilding domains
   - Add wrappers for sched_domains_mutex
   - Generalize unique visiting of root domains
   - Rebuild root domain accounting after every update
   - Remove partition_and_rebuild_sched_domains
   - Stop exposing partition_sched_domains_locked

  RSEQ: (Michael Jeanson)
   - Update kernel fields in lockstep with CONFIG_DEBUG_RSEQ=y
   - Fix segfault on registration when rseq_cs is non-zero
   - selftests: Add rseq syscall errors test
   - selftests: Ensure the rseq ABI TLS is actually 1024 bytes

  Membarriers:
   - Fix redundant load of membarrier_state (Nysal Jan K.A.)

  Scheduler debugging:
   - Introduce and use preempt_model_str() (Sebastian Andrzej Siewior)
   - Make CONFIG_SCHED_DEBUG unconditional (Ingo Molnar)

  Fixes and cleanups:
   - Always save/restore x86 TSC sched_clock() on suspend/resume
     (Guilherme G. Piccoli)
   - Misc fixes and cleanups (Thorsten Blum, Juri Lelli, Sebastian
     Andrzej Siewior)"

* tag 'sched-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
  cpuidle, sched: Use smp_mb__after_atomic() in current_clr_polling()
  sched/debug: Remove CONFIG_SCHED_DEBUG
  sched/debug: Remove CONFIG_SCHED_DEBUG from self-test config files
  sched/debug, Documentation: Remove (most) CONFIG_SCHED_DEBUG references from documentation
  sched/debug: Make CONFIG_SCHED_DEBUG functionality unconditional
  sched/debug: Make 'const_debug' tunables unconditional __read_mostly
  sched/debug: Change SCHED_WARN_ON() to WARN_ON_ONCE()
  rseq/selftests: Fix namespace collision with rseq UAPI header
  include/{topology,cpuset}: Move dl_rebuild_rd_accounting to cpuset.h
  sched/topology: Stop exposing partition_sched_domains_locked
  cgroup/cpuset: Remove partition_and_rebuild_sched_domains
  sched/topology: Remove redundant dl_clear_root_domain call
  sched/deadline: Rebuild root domain accounting after every update
  sched/deadline: Generalize unique visiting of root domains
  sched/topology: Wrappers for sched_domains_mutex
  sched/deadline: Ignore special tasks when rebuilding domains
  tracing: Use preempt_model_str()
  xtensa: Rely on generic printing of preemption model
  x86: Rely on generic printing of preemption model
  s390: Rely on generic printing of preemption model
  ...

sched/debug: Remove CONFIG_SCHED_DEBUG from self-test config files

2025-03-19T21:23:24+00:00

We leave most of the defconfigs alone (there's over 70 of them),
but let's remove CONFIG_SCHED_DEBUG from the scheduler self-test
Kconfig files.

Signed-off-by: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Juri Lelli 
Cc: Vincent Guittot 
Cc: Dietmar Eggemann 
Cc: Steven Rostedt 
Cc: Ben Segall 
Cc: Mel Gorman 
Cc: Valentin Schneider 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/Z9szt3MpQmQ56TRd@gmail.com

sched_ext: Merge branch 'for-6.14-fixes' into for-6.15

2025-03-03T18:02:22+00:00

Pull for-6.14-fixes to receive:

  9360dfe4cbd6 ("sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()")

which conflicts with:

  337d1b354a29 ("sched_ext: Move built-in idle CPU selection policy to a separate file")

Signed-off-by: Tejun Heo

selftests/sched_ext: Add NUMA-aware scheduler test

2025-02-26T18:49:02+00:00

Add a selftest to validate the behavior of the NUMA-aware scheduler
functionalities, including idle CPU selection within nodes, per-node
DSQs and CPU to node mapping.

Signed-off-by: Andrea Righi 
Signed-off-by: Tejun Heo

sched_ext: selftests: Fix grammar in tests description

2025-02-13T16:46:22+00:00

Fixed grammar for a few tests of sched_ext.

Signed-off-by: Devaansh Kumar 
Signed-off-by: Tejun Heo

sched_ext: selftests/dsp_local_on: Fix selftest on UP systems

2025-01-27T19:00:09+00:00

In UP systems p->migration_disabled is not available. Fix this by using
the portable helper is_migration_disabled(p).

Fixes: e9fe182772dc ("sched_ext: selftests/dsp_local_on: Fix sporadic failures")
Signed-off-by: Andrea Righi 
Signed-off-by: Tejun Heo