{
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   "cell_type": "code",
   "execution_count": null,
   "id": "bfe01ceb-2f27-41b3-b3ba-50ec65cfddda",
   "metadata": {},
   "outputs": [],
   "source": [
    "from pythonbpf import bpf, map, section, bpfglobal, BPF, trace_fields\n",
    "from pythonbpf.helper import ktime\n",
    "from pythonbpf.maps import HashMap\n",
    "\n",
    "from ctypes import c_void_p, c_int64"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ddb115f4-20a7-43bc-bb5b-ccbfd6031fc2",
   "metadata": {},
   "outputs": [],
   "source": [
    "@bpf\n",
    "@map\n",
    "def last() -> HashMap:\n",
    "    return HashMap(key=c_int64, value=c_int64, max_entries=1)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@section(\"tracepoint/syscalls/sys_enter_sync\")\n",
    "def do_trace(ctx: c_void_p) -> c_int64:\n",
    "    key = 0\n",
    "    tsp = last.lookup(key)\n",
    "    if tsp:\n",
    "        delta = ktime() - tsp\n",
    "        if delta < 1000000000:\n",
    "            time_ms = delta // 1000000\n",
    "            print(f\"{time_ms}\")\n",
    "        last.delete(key)\n",
    "    else:\n",
    "        last.update(key, ktime())\n",
    "    return 0\n",
    "\n",
    "\n",
    "@bpf\n",
    "@bpfglobal\n",
    "def LICENSE() -> str:\n",
    "    return \"GPL\"\n",
    "\n",
    "\n",
    "# Compile and load\n",
    "b = BPF()\n",
    "b.load()\n",
    "b.attach_all()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e4f46574-9fd8-46e7-9c7b-27a36d07f200",
   "metadata": {},
   "outputs": [],
   "source": [
    "print(\"Tracing for quick sync's... Ctrl-C to end\")\n",
    "\n",
    "# format output\n",
    "start = 0\n",
    "while True:\n",
    "    try:\n",
    "        task, pid, cpu, flags, ts, ms = trace_fields()\n",
    "        if start == 0:\n",
    "            start = ts\n",
    "        ts -= start\n",
    "        print(f\"At time {ts} s: Multiple syncs detected, last {ms} ms ago\")\n",
    "    except KeyboardInterrupt:\n",
    "        exit()"
   ]
  }
 ],
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