diff options
| author | Tejun Heo <tj@kernel.org> | 2026-04-29 08:09:11 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-04-29 08:25:07 -1000 |
| commit | 5ba0a42423335f76d3e0513df42416c69dc6b742 (patch) | |
| tree | 12d27f10064245967b4653597660e15d4a66716b /tools/sched_ext | |
| parent | a58e6b79b432f2f08e6a2bbe638a60e4424a7cba (diff) | |
sched_ext: Add cid-form kfunc wrappers alongside cpu-form
cpumask is awkward from BPF and unusable from arena; cid/cmask work in
both. Sub-sched enqueue will need cmask. Without full cid coverage a
scheduler has to mix cid and cpu forms, which is a subtle-bug factory.
Close the gap with a cid-native interface.
Pair every cpu-form kfunc that takes a cpu id with a cid-form
equivalent (kick, task placement, cpuperf query/set, per-cpu current
task, nr-cpu-ids). Add two cid-natives with no cpu-form sibling:
scx_bpf_this_cid() (cid of the running cpu, scx equivalent of
bpf_get_smp_processor_id) and scx_bpf_nr_online_cids().
scx_bpf_cpu_rq is deprecated; no cid-form counterpart. NUMA node info
is reachable via scx_bpf_cid_topo() on the BPF side.
Each cid-form wrapper is a thin cid -> cpu translation that delegates
to the cpu path, registered in the same context sets so usage
constraints match.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Reviewed-by: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Diffstat (limited to 'tools/sched_ext')
| -rw-r--r-- | tools/sched_ext/include/scx/common.bpf.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h index ff57a7acdbeb..5f715d69cde6 100644 --- a/tools/sched_ext/include/scx/common.bpf.h +++ b/tools/sched_ext/include/scx/common.bpf.h @@ -105,6 +105,15 @@ void scx_bpf_events(struct scx_event_stats *events, size_t events__sz) __ksym __ s32 scx_bpf_cpu_to_cid(s32 cpu) __ksym __weak; s32 scx_bpf_cid_to_cpu(s32 cid) __ksym __weak; void scx_bpf_cid_topo(s32 cid, struct scx_cid_topo *out) __ksym __weak; +void scx_bpf_kick_cid(s32 cid, u64 flags) __ksym __weak; +s32 scx_bpf_task_cid(const struct task_struct *p) __ksym __weak; +s32 scx_bpf_this_cid(void) __ksym __weak; +struct task_struct *scx_bpf_cid_curr(s32 cid) __ksym __weak; +u32 scx_bpf_nr_cids(void) __ksym __weak; +u32 scx_bpf_nr_online_cids(void) __ksym __weak; +u32 scx_bpf_cidperf_cap(s32 cid) __ksym __weak; +u32 scx_bpf_cidperf_cur(s32 cid) __ksym __weak; +void scx_bpf_cidperf_set(s32 cid, u32 perf) __ksym __weak; /* * Use the following as @it__iter when calling scx_bpf_dsq_move[_vtime]() from |