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| author | Andrea Righi <[email protected]> | 2025-07-05 05:43:51 +0000 |
|---|---|---|
| committer | Tejun Heo <[email protected]> | 2025-07-17 18:19:38 +0000 |
| commit | 06efc9fe0b8deeb83b47fd7c5451fe1a60c8a761 (patch) | |
| tree | a86d51a455e72054f59a3d78e8a1a2b39543111f /drivers/usb/cdns3/cdns3-ti.c | |
| parent | sched/ext: Prevent update_locked_rq() calls with NULL rq (diff) | |
| download | kernel-06efc9fe0b8deeb83b47fd7c5451fe1a60c8a761.tar.gz kernel-06efc9fe0b8deeb83b47fd7c5451fe1a60c8a761.zip | |
sched_ext: idle: Handle migration-disabled tasks in idle selection
When SCX_OPS_ENQ_MIGRATION_DISABLED is enabled, migration-disabled tasks
are also routed to ops.enqueue(). A scheduler may attempt to dispatch
such tasks directly to an idle CPU using the default idle selection
policy via scx_bpf_select_cpu_and() or scx_bpf_select_cpu_dfl().
This scenario must be properly handled by the built-in idle policy to
avoid returning an idle CPU where the target task isn't allowed to run.
Otherwise, it can lead to errors such as:
EXIT: runtime error (SCX_DSQ_LOCAL[_ON] cannot move migration disabled Chrome_ChildIOT[291646] from CPU 3 to 14)
Prevent this by explicitly handling migration-disabled tasks in the
built-in idle selection logic, maintaining their CPU affinity.
Fixes: a730e3f7a48bc ("sched_ext: idle: Consolidate default idle CPU selection kfuncs")
Signed-off-by: Andrea Righi <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
Diffstat (limited to 'drivers/usb/cdns3/cdns3-ti.c')
0 files changed, 0 insertions, 0 deletions