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1 // sampler.cpp |
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2 // |
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3 // Copyright (c) 2010 Accenture. All rights reserved. |
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4 // This component and the accompanying materials are made available |
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5 // under the terms of the "Eclipse Public License v1.0" |
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6 // which accompanies this distribution, and is available |
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7 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 // |
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9 // Initial Contributors: |
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10 // Accenture - Initial contribution |
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11 // |
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12 #include "sampler.h" |
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13 #include <fshell/btrace_parser_defs.h> |
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14 #include <fshell/common.mmh> |
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15 |
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16 // Please note this code is NOT SMP-safe. The whole mechanism of using an interrupt doesn't work under SMP so there's no point adding TSpinLocks or similar |
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17 #ifdef __SMP__ |
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18 #error "Sampler doesn't work under SMP!" |
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19 #endif |
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20 |
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21 TUint IntStackPtr(); |
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22 TUint IDFCRunning(); |
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23 |
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24 DCpuSampler::DCpuSampler() |
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25 : iTimer(NTimer(&Sample, this)) |
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26 { |
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27 #if defined(__MARM__) |
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28 iIntStackTop=(TUint*)IntStackPtr(); |
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29 #endif |
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30 } |
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31 |
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32 DCpuSampler::~DCpuSampler() |
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33 { |
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34 iTimer.Cancel(); |
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35 } |
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36 |
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37 void DCpuSampler::Sample(TAny* aPtr) |
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38 { |
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39 static_cast<DCpuSampler*>(aPtr)->DoSample(); |
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40 } |
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41 |
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42 void DCpuSampler::DoSample() |
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43 { |
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44 TInt err = iTimer.Again(1); |
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45 if (err == KErrArgument) |
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46 { |
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47 // Missed a tick, oh well |
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48 iTimer.OneShot(1); |
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49 } |
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50 |
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51 NThread* thread = NKern::CurrentThread(); |
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52 if (iCpuUsageCallbackFn) |
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53 { |
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54 // Not used by anything in fshell pkg |
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55 (*iCpuUsageCallbackFn)(iContext, thread); |
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56 } |
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57 |
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58 if (iProfiling) |
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59 { |
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60 Usample(thread); |
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61 } |
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62 iContext = thread; |
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63 } |
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64 |
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65 TBool DCpuSampler::ShouldRun() const |
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66 { |
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67 return iProfiling || iCpuUsageCallbackFn != NULL; |
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68 } |
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69 |
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70 void DCpuSampler::SettingsChanged() |
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71 { |
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72 // Call with interrupts disabled |
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73 if (ShouldRun()) |
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74 { |
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75 #if FSHELL_PLATFORM_SYMTB >= 92 |
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76 if (!iTimer.IsPending()) |
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77 #else |
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78 if (iTimer.iState == NTimer::EIdle) |
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79 #endif |
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80 { |
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81 iContext = NULL; |
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82 iTimerHeartbeat = 0; |
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83 iTimer.OneShot(1); |
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84 } |
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85 } |
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86 else |
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87 { |
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88 iTimer.Cancel(); |
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89 } |
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90 } |
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91 |
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92 void DCpuSampler::SetCpuUsageSampling(MExtraBtrace::TCpuUsageCallback aCallbackFn) |
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93 { |
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94 TUint irq = NKern::DisableAllInterrupts(); |
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95 iCpuUsageCallbackFn = aCallbackFn; |
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96 SettingsChanged(); |
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97 NKern::RestoreInterrupts(irq); |
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98 } |
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99 |
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100 |
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101 void DCpuSampler::SetProfilingSampling(TBool aEnabled) |
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102 { |
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103 TUint irq = NKern::DisableAllInterrupts(); |
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104 iProfiling = aEnabled; |
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105 SettingsChanged(); |
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106 NKern::RestoreInterrupts(irq); |
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107 } |
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108 |
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109 void DCpuSampler::Usample(NThread* pN) |
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110 { |
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111 if (Kern::NThreadToDThread(pN)!=NULL) |
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112 { |
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113 #if defined(__MARM__) |
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114 TBool idfcRunning = IDFCRunning(); |
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115 TLinAddr pC=((iIntStackTop)[-1]) & ~1; //clear LSB bit (in case of Jazelle code) |
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116 #else |
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117 // Can't get this info if we don't have the .cia functions |
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118 TBool idfcRunning = EFalse; |
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119 TLinAddr pC = 0; |
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120 #endif |
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121 |
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122 if (idfcRunning) |
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123 { |
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124 //no useful thread context |
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125 BTrace4(BTrace::EProfiling,BTrace::ECpuIdfcSample,pC); |
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126 } |
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127 else |
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128 { |
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129 if (iContext!=pN) |
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130 { |
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131 BTrace8(BTrace::EProfiling,BTrace::ECpuFullSample,pC,pN); |
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132 } |
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133 else |
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134 { |
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135 //optimisation - context of previous sample is assumed |
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136 BTrace4(BTrace::EProfiling,BTrace::ECpuOptimisedSample,pC); |
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137 } |
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138 } |
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139 } |
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140 else |
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141 { |
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142 BTrace0(BTrace::EProfiling,BTrace::ECpuNonSymbianThreadSample); |
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143 } |
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144 } |