diff options
| author | Andrea Righi <arighi@nvidia.com> | 2025-03-13 18:03:21 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2025-03-13 07:07:27 -1000 |
| commit | 97e13ecb026684dcd428910701662275175a2315 (patch) | |
| tree | 78b8a65eb6a2ee3b155bbd5a5209c3bd883554fe /kernel | |
| parent | 71d078803ccbc020ae3b640293a40a86691b9151 (diff) | |
sched_ext: Skip per-CPU tasks in scx_bpf_reenqueue_local()
scx_bpf_reenqueue_local() can be invoked from ops.cpu_release() to give
tasks that are queued to the local DSQ a chance to migrate to other
CPUs, when a CPU is taken by a higher scheduling class.
However, there is no point re-enqueuing tasks that can only run on that
particular CPU, as they would simply be re-added to the same local DSQ
without any benefit.
Therefore, skip per-CPU tasks in scx_bpf_reenqueue_local().
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/ext.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index debcd1cf2de9..db5bc4d57dba 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -6621,8 +6621,12 @@ __bpf_kfunc u32 scx_bpf_reenqueue_local(void) * CPUs disagree, they use %ENQUEUE_RESTORE which is bypassed to * the current local DSQ for running tasks and thus are not * visible to the BPF scheduler. + * + * Also skip re-enqueueing tasks that can only run on this + * CPU, as they would just be re-added to the same local + * DSQ without any benefit. */ - if (p->migration_pending) + if (p->migration_pending || is_migration_disabled(p) || p->nr_cpus_allowed == 1) continue; dispatch_dequeue(rq, p); |