41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* A scheduler that validates the behavior of direct dispatching with a default
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* select_cpu implementation.
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*
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* Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
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* Copyright (c) 2023 David Vernet <dvernet@meta.com>
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* Copyright (c) 2023 Tejun Heo <tj@kernel.org>
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*/
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#include <scx/common.bpf.h>
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char _license[] SEC("license") = "GPL";
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bool saw_local = false;
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static bool task_is_test(const struct task_struct *p)
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{
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return !bpf_strncmp(p->comm, 9, "select_cpu");
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}
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void BPF_STRUCT_OPS(select_cpu_dfl_enqueue, struct task_struct *p,
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u64 enq_flags)
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{
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const struct cpumask *idle_mask = scx_bpf_get_idle_cpumask();
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if (task_is_test(p) &&
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bpf_cpumask_test_cpu(scx_bpf_task_cpu(p), idle_mask)) {
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saw_local = true;
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}
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scx_bpf_put_idle_cpumask(idle_mask);
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scx_bpf_dsq_insert(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);
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}
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SEC(".struct_ops.link")
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struct sched_ext_ops select_cpu_dfl_ops = {
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.enqueue = (void *) select_cpu_dfl_enqueue,
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.name = "select_cpu_dfl",
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};
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