41 lines · c
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 15bool saw_local = false;16 17static bool task_is_test(const struct task_struct *p)18{19 return !bpf_strncmp(p->comm, 9, "select_cpu");20}21 22void BPF_STRUCT_OPS(select_cpu_dfl_enqueue, struct task_struct *p,23 u64 enq_flags)24{25 const struct cpumask *idle_mask = scx_bpf_get_idle_cpumask();26 27 if (task_is_test(p) &&28 bpf_cpumask_test_cpu(scx_bpf_task_cpu(p), idle_mask)) {29 saw_local = true;30 }31 scx_bpf_put_idle_cpumask(idle_mask);32 33 scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);34}35 36SEC(".struct_ops.link")37struct sched_ext_ops select_cpu_dfl_ops = {38 .enqueue = (void *) select_cpu_dfl_enqueue,39 .name = "select_cpu_dfl",40};41