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   "cell_type": "code",
   "execution_count": null,
   "id": "c3520e58-e50f-4bc1-8f9d-a6fecbf6e9f0",
   "metadata": {},
   "outputs": [],
   "source": [
    "from vmlinux import struct_request, struct_pt_regs\n",
    "from pythonbpf import bpf, section, bpfglobal, map, BPF\n",
    "from pythonbpf.helper import ktime\n",
    "from pythonbpf.maps import HashMap\n",
    "from ctypes import c_int64, c_uint64, c_int32\n",
    "\n",
    "REQ_WRITE = 1\n",
    "\n",
    "\n",
    "@bpf\n",
    "@map\n",
    "def start() -> HashMap:\n",
    "    return HashMap(key=c_uint64, value=c_uint64, max_entries=10240)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@section(\"kprobe/blk_mq_end_request\")\n",
    "def trace_completion(ctx: struct_pt_regs) -> c_int64:\n",
    "    # Get request pointer from first argument\n",
    "    req_ptr = ctx.di\n",
    "    req = struct_request(ctx.di)\n",
    "    # Print: data_len, cmd_flags, latency_us\n",
    "    data_len = req.__data_len\n",
    "    cmd_flags = req.cmd_flags\n",
    "    # Lookup start timestamp\n",
    "    req_tsp = start.lookup(req_ptr)\n",
    "    if req_tsp:\n",
    "        # Calculate delta in nanoseconds\n",
    "        delta = ktime() - req_tsp\n",
    "\n",
    "        # Convert to microseconds for printing\n",
    "        delta_us = delta // 1000\n",
    "\n",
    "        print(f\"{data_len} {cmd_flags:x} {delta_us}\\n\")\n",
    "\n",
    "        # Delete the entry\n",
    "        start.delete(req_ptr)\n",
    "\n",
    "    return c_int64(0)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@section(\"kprobe/blk_mq_start_request\")\n",
    "def trace_start(ctx1: struct_pt_regs) -> c_int32:\n",
    "    req = ctx1.di\n",
    "    ts = ktime()\n",
    "    start.update(req, ts)\n",
    "    return c_int32(0)\n",
    "\n",
    "\n",
    "@bpf\n",
    "@bpfglobal\n",
    "def LICENSE() -> str:\n",
    "    return \"GPL\"\n",
    "\n",
    "\n",
    "b = BPF()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "97040f73-98e0-4993-94c6-125d1b42d931",
   "metadata": {},
   "outputs": [],
   "source": [
    "b.load()\n",
    "b.attach_all()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b1bd4f51-fa25-42e1-877c-e48a2605189f",
   "metadata": {},
   "outputs": [],
   "source": [
    "from pythonbpf import trace_pipe"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "96b4b59b-b0db-4952-9534-7a714f685089",
   "metadata": {},
   "outputs": [],
   "source": [
    "trace_pipe()"
   ]
  }
 ],
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