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/* SPDX-License-Identifier: GPL-2.0 */ /* * A scheduler that validates the behavior of direct dispatching with a default * select_cpu implementation. * * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. * Copyright (c) 2023 David Vernet <dvernet@meta.com> * Copyright (c) 2023 Tejun Heo <tj@kernel.org> */ #include <scx/common.bpf.h> char _license[] SEC("license") = "GPL"; s32 BPF_STRUCT_OPS(select_cpu_dispatch_select_cpu, struct task_struct *p, s32 prev_cpu, u64 wake_flags) { u64 dsq_id = SCX_DSQ_LOCAL; s32 cpu = prev_cpu; if (scx_bpf_test_and_clear_cpu_idle(cpu)) goto dispatch; cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0); if (cpu >= 0) goto dispatch; dsq_id = SCX_DSQ_GLOBAL; cpu = prev_cpu; dispatch: scx_bpf_dispatch(p, dsq_id, SCX_SLICE_DFL, 0); return cpu; } SEC(".struct_ops.link") struct sched_ext_ops select_cpu_dispatch_ops = { .select_cpu = (void *) select_cpu_dispatch_select_cpu, .name = "select_cpu_dispatch", .timeout_ms = 1000U, };