scx_layered 1.0.16

A highly configurable multi-layer BPF / user space hybrid scheduler used within sched_ext, which is a Linux kernel feature which enables implementing kernel thread schedulers in BPF and dynamically loading them. https://github.com/sched-ext/scx/tree/main
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

#!/usr/bin/env -S bpftrace --unsafe -q

/*
 * Asserts that the `node` layer config works properly by failing if the pid
 * passed to the script runs on NUMA node 1. The layered config should restrict
 * the pid passed to the script to run on a layer that only runs on NUMA node 0.
 */

BEGIN
{
	@bpftrace_pid = pid;
	@sig = 0;

	if ($1 == 0) {
		// exit 137
		@sig = 9;
	}
}

profile:hz:1
{
	@counts[cpu] = @counts[cpu] + 1;
	if (@counts[cpu] == 15) {
		// exit 0
		@sig = 15;
	}
}

rawtracepoint:sched_switch
{
	$task = (struct task_struct *)arg1;

	if (($task->parent->pid == $1 && numaid == 1) ||
	    ($task->real_parent->pid == $1 && numaid == 1)) {
		// exit 137
		@sig = 9;
	}
}

kprobe:__x64_sys_* / @bpftrace_pid == pid / {
	if (@sig > 0) {
		signal(@sig);
	}
}

interval:s:1 {
	print(("bpftrace monitoring pid", $1, "signal", @sig));
}