1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * A scheduler that validates the behavior of direct dispatching with a default 4 * 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 13 char _license[] SEC("license") = "GPL"; 14 15 UEI_DEFINE(uei); 16 17 s32 BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_select_cpu, struct task_struct *p, 18 s32 prev_cpu, u64 wake_flags) 19 { 20 /* Dispatching twice in a row is disallowed. */ 21 scx_bpf_dsq_insert(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0); 22 scx_bpf_dsq_insert(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0); 23 24 return prev_cpu; 25 } 26 27 void BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_exit, struct scx_exit_info *ei) 28 { 29 UEI_RECORD(uei, ei); 30 } 31 32 SEC(".struct_ops.link") 33 struct sched_ext_ops select_cpu_dispatch_dbl_dsp_ops = { 34 .select_cpu = (void *) select_cpu_dispatch_dbl_dsp_select_cpu, 35 .exit = (void *) select_cpu_dispatch_dbl_dsp_exit, 36 .name = "select_cpu_dispatch_dbl_dsp", 37 .timeout_ms = 1000U, 38 }; 39