150 This reduces the live page list to a minimum. |
150 This reduces the live page list to a minimum. |
151 */ |
151 */ |
152 void FlushAll(); |
152 void FlushAll(); |
153 |
153 |
154 /** |
154 /** |
155 Flush demand paged pages in a specified region. |
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156 |
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157 The memory must reside in a single memory object. |
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158 |
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159 @param aProcess The process containing the pages to flush. |
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160 @param aStart The start address of the region. |
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161 @param aSize The size of the region in bytes. |
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162 |
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163 @return KErrBadDescriptor If the memory region is invalid or spans more than one memory object, |
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164 otherwise KErrNone. |
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165 */ |
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166 TInt FlushRegion(DMemModelProcess* aProcess, TLinAddr aStartAddress, TUint aSize); |
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167 |
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168 /** |
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169 Give pages to paging system for managing. |
155 Give pages to paging system for managing. |
170 */ |
156 */ |
171 void DonatePages(TUint aCount, TPhysAddr* aPages); |
157 void DonatePages(TUint aCount, TPhysAddr* aPages); |
172 |
158 |
173 /** |
159 /** |
416 |
402 |
417 @param aCleanInSequence Whether pages must have sequential page colour |
403 @param aCleanInSequence Whether pages must have sequential page colour |
418 */ |
404 */ |
419 void SetCleanInSequence(TBool aCleanInSequence); |
405 void SetCleanInSequence(TBool aCleanInSequence); |
420 |
406 |
421 /** |
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422 Generate a new error code that includes both the original error code and some extra context |
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423 information. This is used to communicate context information from where it occurs to where it |
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424 is handled. |
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425 */ |
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426 TInt EmbedErrorContext(TPagingErrorContext aContext, TInt aError); |
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427 |
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428 /** |
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429 Extract the context information from a error code generated by #EmbedErrorContext. |
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430 */ |
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431 static TPagingErrorContext ExtractErrorContext(TInt aContextError); |
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432 |
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433 /** |
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434 Extract the original error code from a error code generated by #EmbedErrorContext. |
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435 */ |
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436 static TInt ExtractErrorCode(TInt aContextError); |
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437 |
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438 private: |
407 private: |
439 /** |
408 /** |
440 Add a page to the head of the live page list. I.e. make it the 'youngest' page. |
409 Add a page to the head of the live page list. I.e. make it the 'youngest' page. |
441 |
410 |
442 @pre MmuLock held |
411 @pre MmuLock held |
655 @return True if operation was successful. |
624 @return True if operation was successful. |
656 */ |
625 */ |
657 TBool ReservePage(); |
626 TBool ReservePage(); |
658 |
627 |
659 /** |
628 /** |
660 Determine the thread responsible for this page fault. This returns either NULL to indicate |
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661 the current thread, or a remote thread if the fault is caused by an IPC operation. |
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662 */ |
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663 DThread* ResponsibleThread(DThread* aThread, TAny* aExceptionInfo); |
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664 |
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665 /** |
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666 Called when a realtime thread takes a paging fault. |
629 Called when a realtime thread takes a paging fault. |
667 Checks whether it's OK for the thread to take to fault. |
630 Checks whether it's OK for the thread to take to fault. |
668 @return KErrNone if the paging fault should be further processed |
631 @return KErrNone if the paging fault should be further processed |
669 */ |
632 */ |
670 TInt CheckRealtimeThreadFault(DThread* aThread, TAny* aExceptionInfo); |
633 TInt CheckRealtimeThreadFault(DThread* aThread, TAny* aExceptionInfo); |
671 |
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672 /** |
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673 Kills the thread responsible for causing a page fault. |
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674 |
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675 This is called when a fatal error is encountered when handling a page fault, for example, if a |
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676 media access fails. |
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677 |
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678 Originally the paging system reacted by faulting the system in such cases. However the current |
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679 approach was thought to be preferable as this kind of error can happen in practice (even though |
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680 in theory it should not) and it means that the error code is reported and can be captured by |
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681 MobileCrash. |
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682 */ |
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683 void KillResponsibleThread(TPagingErrorContext aErrorCategory, TInt aErrorCode, |
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684 TAny* aExceptionInfo); |
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685 |
634 |
686 /** |
635 /** |
687 Attempt to find the page table entry and page info for a page in the specified mapping. |
636 Attempt to find the page table entry and page info for a page in the specified mapping. |
688 |
637 |
689 @param aOsAsid The OsAsid of the process that owns the mapping. |
638 @param aOsAsid The OsAsid of the process that owns the mapping. |
743 void ResetBenchmarkData(TPagingBenchmark aBm); |
692 void ResetBenchmarkData(TPagingBenchmark aBm); |
744 void ReadBenchmarkData(TPagingBenchmark aBm, SPagingBenchmarkInfo& aDataOut); |
693 void ReadBenchmarkData(TPagingBenchmark aBm, SPagingBenchmarkInfo& aDataOut); |
745 TSpinLock iBenchmarkLock; |
694 TSpinLock iBenchmarkLock; |
746 SPagingBenchmarkInfo iBenchmarkInfo[EMaxPagingBm]; |
695 SPagingBenchmarkInfo iBenchmarkInfo[EMaxPagingBm]; |
747 #endif //__DEMAND_PAGING_BENCHMARKS__ |
696 #endif //__DEMAND_PAGING_BENCHMARKS__ |
748 |
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749 #ifdef _DEBUG |
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750 TPagingErrorContext iDebugFailContext; |
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751 #endif |
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752 }; |
697 }; |
753 |
698 |
754 extern DPager ThePager; |
699 extern DPager ThePager; |
755 |
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756 |
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757 // Functions to embed context information into error codes, using the following scheme: |
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758 // |
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759 // bits 0-16 taken from original error code |
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760 // bits 16-31 bitwise NOT of a TPagingErrorContext value |
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761 // |
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762 // Since the context informtion is a small positive integer, the resulting error code is still a |
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763 // negative integer. The value EPagingErrorContextNone is zero, yeilding the original error code |
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764 // unchanged if embedded. |
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765 |
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766 inline TInt DPager::EmbedErrorContext(TPagingErrorContext aContext, TInt aError) |
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767 { |
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768 __NK_ASSERT_DEBUG(aContext > 0 && aContext <= 0x7fff); |
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769 #ifdef _DEBUG |
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770 if (aError >= KErrNone) |
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771 { |
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772 TUint32 match = aContext; |
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773 if (__e32_atomic_cas_ord32(&iDebugFailContext, &match, 0)) |
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774 aError = KErrAbort; |
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775 } |
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776 #endif |
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777 if (aError >= KErrNone) |
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778 return aError; |
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779 if (aError < (TInt)0xffff0000) |
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780 aError = KErrGeneral; // lose error code, but doesn't happen in practice |
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781 return (aError & 0x0000ffff) | ((~aContext) << 16); |
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782 } |
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783 |
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784 inline TPagingErrorContext DPager::ExtractErrorContext(TInt aContextError) |
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785 { |
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786 return (TPagingErrorContext)((~aContextError) >> 16); |
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787 } |
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788 |
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789 inline TInt DPager::ExtractErrorCode(TInt aContextError) |
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790 { |
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791 return aContextError | 0x7fff000; |
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792 } |
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793 |
700 |
794 |
701 |
795 #ifdef __DEMAND_PAGING_BENCHMARKS__ |
702 #ifdef __DEMAND_PAGING_BENCHMARKS__ |
796 |
703 |
797 #define START_PAGING_BENCHMARK TUint32 _bmStart = NKern::FastCounter() |
704 #define START_PAGING_BENCHMARK TUint32 _bmStart = NKern::FastCounter() |