[GIT PULL] sched_ext: Changes for v6.15

[Tejun Heo <tj@kernel.org>]

The following changes since commit 9360dfe4cbd62ff1eb8217b815964931523b75b3:

  sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl() (2025-03-03 07:55:48 -1000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/ tags/sched_ext-for-6.15

for you to fetch changes up to e4855fc90e52efef7e3926205c8dc53ce39b6138:

  sched_ext: idle: Refactor scx_select_cpu_dfl() (2025-03-14 08:17:11 -1000)

----------------------------------------------------------------
sched_ext: Changes for v6.15

- Add mechanism to count and report internal events. This significantly
  improves visibility on subtle corner conditions.

- The default idle CPU selection logic is revamped and improved in multiple
  ways including being made topology aware.

- sched_ext was disabling ttwu_queue for simplicity, which can be costly
  when hardware topology is more complex. Implement
  SCX_OPS_ALLOWED_QUEUED_WAKEUP so that BPF schedulers can selectively
  enable ttwu_queue.

- tools/sched_ext updates to improve compatibility among others.

- Other misc updates and fixes.

- sched_ext/for-6.14-fixes were pulled a few times to receive prerequisite
  fixes and resolve conflicts.

----------------------------------------------------------------
Andrea Righi (16):
      sched_ext: Move built-in idle CPU selection policy to a separate file
      mm/numa: Introduce nearest_node_nodemask()
      sched/topology: Introduce for_each_node_numadist() iterator
      sched_ext: idle: Make idle static keys private
      sched_ext: idle: Introduce SCX_OPS_BUILTIN_IDLE_PER_NODE
      sched_ext: idle: Per-node idle cpumasks
      sched_ext: idle: Introduce node-aware idle cpu kfunc helpers
      sched_ext: idle: Introduce scx_bpf_nr_node_ids()
      sched_ext: idle: Fix scx_bpf_pick_any_cpu_node() behavior
      tools/sched_ext: Provide consistent access to scx flags
      selftests/sched_ext: Add NUMA-aware scheduler test
      tools/sched_ext: Provide a compatible helper for scx_bpf_events()
      sched_ext: Documentation: add task lifecycle summary
      sched_ext: Skip per-CPU tasks in scx_bpf_reenqueue_local()
      sched_ext: idle: Honor idle flags in the built-in idle selection policy
      sched_ext: idle: Refactor scx_select_cpu_dfl()

Changwoo Min (18):
      sched_ext: Implement event counter infrastructure
      sched_ext: Add an event, SCX_EV_SELECT_CPU_FALLBACK
      sched_ext: Add an event, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE
      sched_ext: Add an event, SCX_EV_DISPATCH_KEEP_LAST
      sched_ext: Add an event, SCX_EV_ENQ_SKIP_EXITING
      sched_ext: Add an event, SCX_EV_BYPASS_ACTIVATE
      sched_ext: Add an event, SCX_EV_BYPASS_DISPATCH
      sched_ext: Add an event, SCX_EV_BYPASS_DURATION
      sched_ext: Add scx_bpf_events() and scx_read_event() for BPF schedulers
      sched_ext: Print core event count in scx_central scheduler
      sched_ext: Print core event count in scx_qmap scheduler
      sched_ext: Add an event, SCX_EV_ENQ_SLICE_DFL
      sched_ext: Print an event, SCX_EV_ENQ_SLICE_DFL, in scx_qmap/central
      tools/sched_ext: Compatible testing of SCX_ENQ_CPU_SELECTED
      tools/sched_ext: Update enum_defs.autogen.h
      sched_ext: Provides a sysfs 'events' to expose core event counters
      sched_ext: Change the event type from u64 to s64
      sched_ext: Add trace point to track sched_ext core events

Li RongQing (1):
      sched_ext: Take NUMA node into account when allocating per-CPU cpumasks

Tejun Heo (8):
      Merge branch 'for-6.14-fixes' into for-6.15
      tool/sched_ext: Event counter dumping updates
      sched_ext: Count SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE in the right spot
      sched_ext: Add SCX_EV_ENQ_SKIP_MIGRATION_DISABLED
      Merge branch 'for-6.14-fixes' into for-6.15
      sched_ext: Implement SCX_OPS_ALLOW_QUEUED_WAKEUP
      tools/sched_ext: Sync with scx repo
      sched_ext: Merge branch 'for-6.14-fixes' into for-6.15

Yury Norov (2):
      nodemask: add nodes_copy()
      nodemask: numa: reorganize inclusion path

 Documentation/scheduler/sched-ext.rst           |   36 +
 MAINTAINERS                                     |    3 +-
 include/linux/nodemask.h                        |    8 +-
 include/linux/nodemask_types.h                  |   11 +-
 include/linux/numa.h                            |   17 +-
 include/linux/sched/ext.h                       |    1 +
 include/linux/topology.h                        |   30 +
 include/trace/events/sched_ext.h                |   19 +
 kernel/sched/build_policy.c                     |    1 +
 kernel/sched/core.c                             |    9 +-
 kernel/sched/ext.c                              | 1085 +++++++--------------
 kernel/sched/ext.h                              |   10 +
 kernel/sched/ext_idle.c                         | 1171 +++++++++++++++++++++++
 kernel/sched/ext_idle.h                         |   35 +
 mm/mempolicy.c                                  |   31 +
 tools/sched_ext/include/scx/common.bpf.h        |   34 +
 tools/sched_ext/include/scx/common.h            |    1 +
 tools/sched_ext/include/scx/compat.bpf.h        |   95 ++
 tools/sched_ext/include/scx/compat.h            |   16 +-
 tools/sched_ext/include/scx/enum_defs.autogen.h |  120 +++
 tools/sched_ext/scx_central.c                   |   15 +-
 tools/sched_ext/scx_qmap.bpf.c                  |   23 +-
 tools/testing/selftests/sched_ext/Makefile      |    1 +
 tools/testing/selftests/sched_ext/numa.bpf.c    |  100 ++
 tools/testing/selftests/sched_ext/numa.c        |   59 ++
 25 files changed, 2148 insertions(+), 783 deletions(-)
 create mode 100644 kernel/sched/ext_idle.c
 create mode 100644 kernel/sched/ext_idle.h
 create mode 100644 tools/sched_ext/include/scx/enum_defs.autogen.h
 create mode 100644 tools/testing/selftests/sched_ext/numa.bpf.c
 create mode 100644 tools/testing/selftests/sched_ext/numa.c

-- 
tejun