tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.bpf.c

   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_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0);
  22         scx_bpf_dispatch(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 };