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