66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES
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*
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* Exercise tick dependency transitions between infinite and finite slices.
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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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const volatile s32 test_cpu;
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bool finite_phase;
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u64 nr_inf_running;
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u64 nr_finite_running;
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u64 nr_finite_ticks;
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UEI_DEFINE(uei);
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s32 BPF_STRUCT_OPS(nohz_tick_select_cpu, struct task_struct *p, s32 prev_cpu,
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u64 wake_flags)
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{
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return prev_cpu;
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}
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void BPF_STRUCT_OPS(nohz_tick_enqueue, struct task_struct *p, u64 enq_flags)
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{
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u64 slice = finite_phase ? 1000000ULL : SCX_SLICE_INF;
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scx_bpf_dsq_insert(p, SCX_DSQ_GLOBAL, slice, enq_flags);
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if (enq_flags & SCX_ENQ_LAST)
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scx_bpf_kick_cpu(test_cpu, SCX_KICK_IDLE);
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}
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void BPF_STRUCT_OPS(nohz_tick_running, struct task_struct *p)
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{
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if (bpf_get_smp_processor_id() != test_cpu)
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return;
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if (finite_phase)
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__sync_fetch_and_add(&nr_finite_running, 1);
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else
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__sync_fetch_and_add(&nr_inf_running, 1);
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}
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void BPF_STRUCT_OPS(nohz_tick_tick, struct task_struct *p)
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{
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if (bpf_get_smp_processor_id() == test_cpu && finite_phase)
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__sync_fetch_and_add(&nr_finite_ticks, 1);
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}
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void BPF_STRUCT_OPS(nohz_tick_exit, struct scx_exit_info *ei)
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{
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UEI_RECORD(uei, ei);
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}
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SEC(".struct_ops.link")
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struct sched_ext_ops nohz_tick_ops = {
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.select_cpu = (void *)nohz_tick_select_cpu,
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.enqueue = (void *)nohz_tick_enqueue,
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.running = (void *)nohz_tick_running,
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.tick = (void *)nohz_tick_tick,
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.exit = (void *)nohz_tick_exit,
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.name = "nohz_tick",
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.timeout_ms = 1000U,
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};
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