42 lines
1003 B
C
42 lines
1003 B
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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s32 BPF_STRUCT_OPS(select_cpu_dispatch_select_cpu, struct task_struct *p,
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s32 prev_cpu, u64 wake_flags)
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{
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u64 dsq_id = SCX_DSQ_LOCAL;
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s32 cpu = prev_cpu;
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if (scx_bpf_test_and_clear_cpu_idle(cpu))
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goto dispatch;
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cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0);
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if (cpu >= 0)
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goto dispatch;
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dsq_id = SCX_DSQ_GLOBAL;
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cpu = prev_cpu;
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dispatch:
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scx_bpf_dsq_insert(p, dsq_id, SCX_SLICE_DFL, 0);
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return cpu;
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}
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SEC(".struct_ops.link")
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struct sched_ext_ops select_cpu_dispatch_ops = {
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.select_cpu = (void *) select_cpu_dispatch_select_cpu,
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.name = "select_cpu_dispatch",
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.timeout_ms = 1000U,
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};
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