telemetry/telemetry/internal/platform/power_monitor/msr_power_monitor.py - Issue 3016583002: Remove Windows MSR power monitoring code

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Issue 3016583002: Remove Windows MSR power monitoring code (Closed)

Patch Set: Created 3 years, 3 months ago

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1 # Copyright 2014 The Chromium Authors. All rights reserved.

2 # Use of this source code is governed by a BSD-style license that can be

3 # found in the LICENSE file.

4

5 import logging

6 import platform

7 import re

8

9 from telemetry import decorators

10 from telemetry.internal.platform import power_monitor

11

12

13 MSR_RAPL_POWER_UNIT = 0x606

14 MSR_PKG_ENERGY_STATUS = 0x611 # Whole package

15 MSR_PP0_ENERGY_STATUS = 0x639 # Core

16 MSR_PP1_ENERGY_STATUS = 0x641 # Uncore

17 MSR_DRAM_ENERGY_STATUS = 0x619

18 IA32_PACKAGE_THERM_STATUS = 0x1b1

19 IA32_TEMPERATURE_TARGET = 0x1a2

20

21

22 def _JoulesToMilliwattHours(value_joules):

23 return value_joules * 1000 / 3600.

24

25

26 def _IsSandyBridgeOrLater(vendor, family, model):

27 # Model numbers from:

28 # https://software.intel.com/en-us/articles/intel-architecture-and-processor-i dentification-with-cpuid-model-and-family-numbers

29 # http://www.speedtraq.com

30 return ('Intel' in vendor and family == 6 and

31 (model in (0x2A, 0x2D) or model >= 0x30))

32

33

34 class MsrPowerMonitor(power_monitor.PowerMonitor):

35 def __init__(self, backend):

36 super(MsrPowerMonitor, self).__init__()

37 self._backend = backend

38 self._start_energy_j = None

39 self._start_temp_c = None

40

41 def CanMonitorPower(self):

42 raise NotImplementedError()

43

44 def StartMonitoringPower(self, browser):

45 self._CheckStart()

46 self._start_energy_j = self._PackageEnergyJoules()

47 self._start_temp_c = self._TemperatureCelsius()

48

49 def StopMonitoringPower(self):

50 self._CheckStop()

51 energy_consumption_j = self._PackageEnergyJoules() - self._start_energy_j

52 average_temp_c = (self._TemperatureCelsius() + self._start_temp_c) / 2.

53 if energy_consumption_j < 0: # Correct overflow.

54 # The energy portion of the MSR is 4 bytes.

55 energy_consumption_j += 2 ** 32 * self._EnergyMultiplier()

56

57 self._start_energy_j = None

58 self._start_temp_c = None

59

60 return {

61 'identifier': 'msr',

62 'energy_consumption_mwh': _JoulesToMilliwattHours(energy_consumption_j),

63 'platform_info': {

64 'average_temperature_c': average_temp_c,

65 },

66 }

67

68 @decorators.Cache

69 def _EnergyMultiplier(self):

70 return 0.5 ** self._backend.ReadMsr(MSR_RAPL_POWER_UNIT, 8, 5)

71

72 def _PackageEnergyJoules(self):

73 return (self._backend.ReadMsr(MSR_PKG_ENERGY_STATUS, 0, 32) *

74 self._EnergyMultiplier())

75

76 def _TemperatureCelsius(self):

77 tcc_activation_temp = self._backend.ReadMsr(IA32_TEMPERATURE_TARGET, 16, 7)

78 if tcc_activation_temp <= 0:

79 tcc_activation_temp = 105

80 package_temp_headroom = self._backend.ReadMsr(

81 IA32_PACKAGE_THERM_STATUS, 16, 7)

82 return tcc_activation_temp - package_temp_headroom

83

84 def _CheckMSRs(self):

85 try:

86 if self._PackageEnergyJoules() <= 0:

87 logging.info('Cannot monitor power: no energy readings.')

88 return False

89

90 if self._TemperatureCelsius() <= 0:

91 logging.info('Cannot monitor power: no temperature readings.')

92 return False

93 except OSError as e:

94 logging.info('Cannot monitor power: %s' % e)

95 return False

96 return True

97

98

99 class MsrPowerMonitorWin(MsrPowerMonitor):

100 def CanMonitorPower(self):

101 family, model = map(int, re.match(

102 '.+ Family ([0-9]+) Model ([0-9]+)',

103 platform.processor()).groups())

104 if not _IsSandyBridgeOrLater(platform.processor(), family, model):

105 logging.info('Cannot monitor power: pre-Sandy Bridge CPU.')

106 return False

107

108 try:

109 return self._CheckMSRs()

110 finally:

111 # Since _CheckMSRs() starts the MSR server on win platform, we must close

112 # it after checking to avoid leaking msr server process.

113 self._backend.CloseMsrServer()

114

115 def StopMonitoringPower(self):

116 power_statistics = super(MsrPowerMonitorWin, self).StopMonitoringPower()

117 self._backend.CloseMsrServer()

118 return power_statistics

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