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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2023 David Vernet <dvernet@meta.com>
* Copyright (c) 2023 Tejun Heo <tj@kernel.org>
*/
#include <scx/common.bpf.h>
char _license[] SEC("license") = "GPL";
/* Manually specify the signature until the kfunc is added to the scx repo. */
s32 scx_bpf_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags,
bool *found) __ksym;
s32 BPF_STRUCT_OPS(enq_select_cpu_fails_select_cpu, struct task_struct *p,
s32 prev_cpu, u64 wake_flags)
{
return prev_cpu;
}
void BPF_STRUCT_OPS(enq_select_cpu_fails_enqueue, struct task_struct *p,
u64 enq_flags)
{
/*
* Need to initialize the variable or the verifier will fail to load.
* Improving these semantics is actively being worked on.
*/
bool found = false;
/* Can only call from ops.select_cpu() */
scx_bpf_select_cpu_dfl(p, 0, 0, &found);
scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);
}
SEC(".struct_ops.link")
struct sched_ext_ops enq_select_cpu_fails_ops = {
.select_cpu = enq_select_cpu_fails_select_cpu,
.enqueue = enq_select_cpu_fails_enqueue,
.name = "enq_select_cpu_fails",
.timeout_ms = 1000U,
};
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