KFunc `scx_bpf_cid_override`

Install an explicit cpu->cid mapping.

Definition

May only be called from ops.init of the root scheduler. Replace the topology-probed cid mapping with the caller-provided one. Each possible cpu must map to a unique cid in [0, num_possible_cpus). Topology info is cleared. On invalid input, trigger scx_error to abort the scheduler.

Parameters

cpu_to_cid: array of nr_cpu_ids s32 entries (cid for each cpu)

cpu_to_cid__sz: must be nr_cpu_ids * sizeof(s32) bytes

Signature

void scx_bpf_cid_override(const s32 *cpu_to_cid, u32 cpu_to_cid__sz)

Note

This function may sleep, and therefore can only be used from sleepable programs.

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

The following program types can make use of this kfunc:

BPF_PROG_TYPE_STRUCT_OPS

Example