Merge tag 'sched_ext-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

Pull sched_ext updates from Tejun Heo:

 - Add support for cgroup "cpu.max" interface

 - Code organization cleanup so that ext_idle.c doesn't depend on the
   source-file-inclusion build method of sched/

 - Drop UP paths in accordance with sched core changes

 - Documentation and other misc changes

* tag 'sched_ext-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  sched_ext: Fix scx_bpf_reenqueue_local() reference
  sched_ext: Drop kfuncs marked for removal in 6.15
  sched_ext, rcu: Eject BPF scheduler on RCU CPU stall panic
  kernel/sched/ext.c: fix typo "occured" -> "occurred" in comments
  sched_ext: Add support for cgroup bandwidth control interface
  sched_ext, sched/core: Factor out struct scx_task_group
  sched_ext: Return NULL in llc_span
  sched_ext: Always use SMP versions in kernel/sched/ext_idle.h
  sched_ext: Always use SMP versions in kernel/sched/ext_idle.c
  sched_ext: Always use SMP versions in kernel/sched/ext.h
  sched_ext: Always use SMP versions in kernel/sched/ext.c
  sched_ext: Documentation: Clarify time slice handling in task lifecycle
  sched_ext: Make scx_locked_rq() inline
  sched_ext: Make scx_rq_bypassing() inline
  sched_ext: idle: Make local functions static in ext_idle.c
  sched_ext: idle: Remove unnecessary ifdef in scx_bpf_cpu_node()

1 files changed, 8 insertions, 3 deletions

diff --git a/Documentation/scheduler/sched-ext.rst b/Documentation/scheduler/sched-ext.rst
index a1869c38046e..404fe6126a76 100644
--- a/Documentation/scheduler/sched-ext.rst
+++ b/Documentation/scheduler/sched-ext.rst
@@ -313,16 +313,21 @@ by a sched_ext scheduler:
         ops.runnable();         /* Task becomes ready to run */
 
         while (task is runnable) {
-            if (task is not in a DSQ) {
+            if (task is not in a DSQ && task->scx.slice == 0) {
                 ops.enqueue();  /* Task can be added to a DSQ */
 
-                /* A CPU becomes available */
+                /* Any usable CPU becomes available */
 
                 ops.dispatch(); /* Task is moved to a local DSQ */
             }
             ops.running();      /* Task starts running on its assigned CPU */
-            ops.tick();         /* Called every 1/HZ seconds */
+            while (task->scx.slice > 0 && task is runnable)
+                ops.tick();     /* Called every 1/HZ seconds */
             ops.stopping();     /* Task stops running (time slice expires or wait) */
+
+            /* Task's CPU becomes available */
+
+            ops.dispatch();     /* task->scx.slice can be refilled */
         }
 
         ops.quiescent();        /* Task releases its assigned CPU (wait) */