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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * A scheduler that validates the behavior of direct dispatching with a default4 * select_cpu implementation.5 *6 * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.7 * Copyright (c) 2023 David Vernet <dvernet@meta.com>8 * Copyright (c) 2023 Tejun Heo <tj@kernel.org>9 */10 11#include <scx/common.bpf.h>12 13char _license[] SEC("license") = "GPL";14 15UEI_DEFINE(uei);16 17s32 BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_select_cpu, struct task_struct *p,18 s32 prev_cpu, u64 wake_flags)19{20 /* Dispatching twice in a row is disallowed. */21 scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0);22 scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0);23 24 return prev_cpu;25}26 27void BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_exit, struct scx_exit_info *ei)28{29 UEI_RECORD(uei, ei);30}31 32SEC(".struct_ops.link")33struct sched_ext_ops select_cpu_dispatch_dbl_dsp_ops = {34 .select_cpu = (void *) select_cpu_dispatch_dbl_dsp_select_cpu,35 .exit = (void *) select_cpu_dispatch_dbl_dsp_exit,36 .name = "select_cpu_dispatch_dbl_dsp",37 .timeout_ms = 1000U,38};39