hwbench/turbostat: Implement version checking

hwbench requires at least turbostat 2022.04.16 (from Kernel 5.19) unless
filtering C1% field would not be possible.

This commit is:
- update the requirement in the documentation

- implements a simple test when Turbostat() is instantiated to guarantee
  the minimal release is present.

- If no suitable release is found, hwbench will stop with a fatal
  message. A typical example looks like the following :

	Monitoring/turbostat: Detected release 19.8.31
	ERROR:root:Monitoring/turbostat: minimal expected release is 2022.4.16

Signed-off-by: Erwan Velu <e.velu@criteo.com>

README.md

@@ -65,7 +65,7 @@ Running the **simple.conf** job:
 ## Mandatory
 - python >= 3.9
 - [python dependencies](./requirements/base.in)
-- turbostat >= 2022.07.28
+- turbostat >= 2022.04.16
 - numactl
 - dmidecode
 - util-linux >= 2.32
@@ -75,4 +75,4 @@ Running the **simple.conf** job:
 ## Optional
 - ipmitool
 - ilorest (for HPE servers)
-- stress-ng >= 0.17.04
+- stress-ng >= 0.17.04

hwbench/environment/turbostat.py

@@ -1,6 +1,8 @@
 import os
+import re
 import subprocess
 from enum import Enum
+from packaging.version import Version
 from ..environment.hardware import BaseHardware
 from ..bench.monitoring_structs import MonitorMetric, CPUContext, PowerContext
 from ..utils.helpers import is_binary_available, fatal
@@ -49,6 +51,7 @@ def __init__(
             CPUSTATS.CORE_WATTS,
             CPUSTATS.PACKAGE_WATTS,
         }
+        self.min_release = Version("2022.04.16")
         self.header = ""
         self.freq_metrics = freq_metrics
         self.power_metrics = power_metrics
@@ -59,8 +62,35 @@ def __init__(
         if not is_binary_available("turbostat"):
             fatal("Missing turbostat binary, please install it.")
         # Let's make a first quick run to detect system
+        self.check_version()
         self.pre_run()
 
+    def check_version(self):
+        english_env = os.environ.copy()
+        english_env["LC_ALL"] = "C"
+        self.process = subprocess.Popen(
+            ["turbostat", "-v"],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            env=english_env,
+            stdin=subprocess.DEVNULL,
+        )
+        # turbostat version 2022.04.16 - Len Brown <lenb@kernel.org>
+        match = re.search(
+            r"turbostat version (?P<version>[0-9]+\.[0-9]+\.[0-9]+).*",
+            str(self.get_process_output()),
+        )
+
+        current_version = Version(match.group("version"))
+        if not match:
+            fatal(f"Monitoring/turbostat: Cannot detect turbostat version")
+
+        print(f"Monitoring/turbostat: Detected release {current_version}")
+        if current_version < self.min_release:
+            fatal(
+                f"Monitoring/turbostat: minimal expected release is {self.min_release}"
+            )
+
     def reset_metrics(self, power_metrics=None):
         if power_metrics is not None:
             self.power_metrics = power_metrics