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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include <kernel.h> |
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17 #include "mpagecleaner.h" |
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18 #include "mm.h" |
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19 #include "mmu.h" |
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20 #include "mpager.h" |
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21 |
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22 #ifdef __PAGING_PRE_CLEAN_DIRTY_PAGES |
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23 |
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24 inline void IgnorePrintf(...) { } |
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25 |
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26 #define PAGE_CLEANER_TRACE IgnorePrintf |
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27 //#define PAGE_CLEANER_TRACE Kern::Printf |
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28 |
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29 _LIT(KThreadName, "PageCleaner"); |
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30 |
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31 const TInt KThreadPriority = 25; |
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32 |
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33 /// The length of time the paging device is idle before we decide to use it for cleaning dirty |
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34 /// pages, in milliseconds. |
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35 const TInt KIdleDelayInMillis = 2; |
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36 |
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37 class DPageCleaner |
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38 { |
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39 public: |
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40 DPageCleaner(); |
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41 void Start(); |
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42 void NotifyPagingDeviceIdle(); |
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43 void NotifyPagingDeviceBusy(); |
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44 void NotifyPagesToClean(); |
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45 |
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46 private: |
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47 inline TBool IsRunning(); |
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48 void UpdateBusyCount(TInt aChange); |
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49 void IdleTimerExpired(TUint aInitialNotificationCount); |
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50 void TryToClean(); |
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51 |
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52 private: |
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53 static void TimerDfcFn(TAny*); |
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54 static void CleanerDfcFn(TAny*); |
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55 |
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56 private: |
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57 TInt iIdleDelayInTicks; |
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58 NTimer iDelayTimer; |
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59 TDfcQue iDfcQue; |
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60 TDfc iTimerDfc; |
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61 TDfc iCleanerDfc; |
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62 TBool iRunning; |
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63 |
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64 // All state below is accessed with the MmuLock held. |
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65 |
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66 /// Whether the paging device is currently idle. |
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67 TBool iPagingDeviceIdle; |
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68 |
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69 /// Whether the paging device has been idle for longer than the wait period. |
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70 TBool iIdleForAWhile; |
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71 |
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72 /// Whether the page cleaner is currently running. |
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73 TBool iCleaningInProgress; |
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74 }; |
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75 |
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76 DPageCleaner ThePageCleaner; |
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77 |
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78 DPageCleaner::DPageCleaner() : |
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79 iTimerDfc(TimerDfcFn, NULL, 1), |
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80 iCleanerDfc(CleanerDfcFn, NULL, 1), |
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81 iRunning(EFalse), |
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82 iPagingDeviceIdle(ETrue), |
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83 iIdleForAWhile(ETrue), |
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84 iCleaningInProgress(EFalse) |
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85 { |
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86 } |
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87 |
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88 void DPageCleaner::Start() |
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89 { |
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90 TBool alreadyRunning = __e32_atomic_swp_ord32(&iRunning, ETrue); |
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91 if (alreadyRunning) |
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92 return; |
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93 |
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94 iIdleDelayInTicks = NKern::TimerTicks(KIdleDelayInMillis); |
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95 |
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96 TInt r = Kern::DfcQInit(&iDfcQue, KThreadPriority, &KThreadName); |
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97 __NK_ASSERT_ALWAYS(r == KErrNone); |
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98 iTimerDfc.SetDfcQ(&iDfcQue); |
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99 iCleanerDfc.SetDfcQ(&iDfcQue); |
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100 |
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101 PAGE_CLEANER_TRACE("PageCleaner started"); |
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102 } |
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103 |
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104 FORCE_INLINE TBool DPageCleaner::IsRunning() |
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105 { |
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106 return __e32_atomic_load_acq32(&iRunning); |
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107 } |
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108 |
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109 void DPageCleaner::NotifyPagingDeviceIdle() |
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110 { |
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111 __NK_ASSERT_DEBUG(MmuLock::IsHeld()); |
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112 if (IsRunning()) |
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113 { |
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114 iPagingDeviceIdle = ETrue; |
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115 if (!iDelayTimer.IsPending()) |
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116 iDelayTimer.OneShot(iIdleDelayInTicks, iTimerDfc); |
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117 } |
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118 } |
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119 |
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120 void DPageCleaner::NotifyPagingDeviceBusy() |
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121 { |
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122 __NK_ASSERT_DEBUG(MmuLock::IsHeld()); |
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123 if (IsRunning()) |
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124 { |
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125 iDelayTimer.Cancel(); |
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126 iPagingDeviceIdle = EFalse; |
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127 iIdleForAWhile = EFalse; |
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128 } |
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129 } |
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130 |
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131 void DPageCleaner::NotifyPagesToClean() |
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132 { |
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133 __NK_ASSERT_DEBUG(MmuLock::IsHeld()); |
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134 if (IsRunning()) |
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135 { |
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136 if (!iCleaningInProgress && iIdleForAWhile) |
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137 iCleanerDfc.Enque(); |
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138 } |
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139 } |
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140 |
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141 void DPageCleaner::TimerDfcFn(TAny* aPtr) |
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142 { |
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143 ThePageCleaner.IdleTimerExpired((TUint)aPtr); |
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144 } |
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145 |
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146 void DPageCleaner::IdleTimerExpired(TUint aInitialNotificationCount) |
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147 { |
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148 MmuLock::Lock(); |
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149 if (iPagingDeviceIdle) |
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150 { |
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151 iIdleForAWhile = ETrue; |
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152 if (!iCleaningInProgress && ThePager.HasPagesToClean()) |
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153 iCleanerDfc.Enque(); |
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154 } |
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155 MmuLock::Unlock(); |
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156 } |
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157 |
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158 void DPageCleaner::CleanerDfcFn(TAny*) |
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159 { |
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160 ThePageCleaner.TryToClean(); |
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161 } |
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162 |
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163 void DPageCleaner::TryToClean() |
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164 { |
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165 MmuLock::Lock(); |
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166 TBool workToDo = iIdleForAWhile && ThePager.HasPagesToClean(); |
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167 iCleaningInProgress = workToDo; |
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168 MmuLock::Unlock(); |
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169 |
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170 if (!workToDo) |
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171 { |
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172 PAGE_CLEANER_TRACE("PageCleaner - started but no work to do"); |
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173 return; |
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174 } |
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175 |
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176 for (;;) |
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177 { |
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178 PageCleaningLock::Lock(); |
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179 MmuLock::Lock(); |
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180 if (!iIdleForAWhile) |
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181 break; |
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182 TInt attempted = ThePager.CleanSomePages(ETrue); |
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183 if (attempted == 0) |
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184 break; |
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185 PAGE_CLEANER_TRACE("PageCleaner - attempted to clean %d pages", attempted); |
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186 MmuLock::Unlock(); |
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187 PageCleaningLock::Unlock(); |
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188 } |
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189 |
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190 if (iIdleForAWhile) |
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191 PAGE_CLEANER_TRACE("PageCleaner - no more pages to clean"); |
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192 else |
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193 PAGE_CLEANER_TRACE("PageCleaner - device now busy"); |
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194 |
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195 iCleaningInProgress = EFalse; |
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196 MmuLock::Unlock(); |
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197 PageCleaningLock::Unlock(); |
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198 } |
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199 |
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200 void PageCleaner::Start() |
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201 { |
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202 ThePageCleaner.Start(); |
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203 } |
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204 |
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205 void PageCleaner::NotifyPagesToClean() |
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206 { |
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207 ThePageCleaner.NotifyPagesToClean(); |
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208 } |
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209 |
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210 EXPORT_C void DPagingDevice::NotifyIdle() |
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211 { |
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212 ThePageCleaner.NotifyPagingDeviceIdle(); |
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213 } |
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214 |
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215 EXPORT_C void DPagingDevice::NotifyBusy() |
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216 { |
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217 ThePageCleaner.NotifyPagingDeviceBusy(); |
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218 } |
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219 |
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220 #else // __PAGING_PRE_CLEAN_DIRTY_PAGES not defined |
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221 |
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222 void PageCleaner::Start() |
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223 { |
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224 } |
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225 |
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226 void PageCleaner::NotifyPagesToClean() |
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227 { |
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228 } |
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229 |
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230 EXPORT_C void DPagingDevice::NotifyIdle() |
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231 { |
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232 } |
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233 |
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234 EXPORT_C void DPagingDevice::NotifyBusy() |
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235 { |
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236 } |
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237 |
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238 #endif |
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239 |
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240 EXPORT_C NFastMutex* DPagingDevice::NotificationLock() |
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241 { |
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242 // use the MmuLock |
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243 return &MmuLock::iLock; |
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244 } |