Windows Mobile 6.5 메모리 관리

1. Windows Mobile 6.5 프로세스 및 메모리 관리 최적화 WEEG Manager andro78@naver.com

2. URL : http://cafe.naver.com/wincepro Since : 2006. 4. 23 Members : about 20,000 Staff : about 15 Manager : andro78@naver.com Contents : - Windows Embedded CE - Windows Mobile

4. 2GB 커널영역

5. 2GB의 모든 Processes들의 영역

6. 각 Slot당 32MB

7. 32개 Process 제한

8. 유저 영역의 상위 절반 (1GB)

9. Process에 의해 읽기/쓰기

10. 공유 메모리(Shared memory)

11. 유저 영역의 상위 절반 (1GB)

12. Process에 의해 읽기/쓰기

13. 가상메모리 관리 단위

15. Application Memory Map 5 COREDLL.DLL 03FF FFFF DLL Space (Constant for all applications) : 프로세스의 보관 영역 Other ROM DLLs ROM DLL space 0200 0000 RAM based DLLs Application Specific Space : 프로세스의 실행 영역 Free virtual space Stack (reserved space) Heap (reserved space) Resources Read write data Read only data Code 0001 0000 0000 0000 reserved

17. RAM에 있는 DLL, Driver는 load/unload하면서 실패

18. 시스템은 RAM이 비어 있다고 reporting

19. 그러나! 메모리 할당 불가

20. 원인

21. 가상 메모리 쪼개짐

23. App2 실행

24. App1 DLL B 로드 + more Heap

25. App2 DLL Z 로드

26. App2 DLL X 로드

27. App1 DLL C 로드 실패!Slot 0 System DLLs Slot 0 System DLLs DLL A DLL A DLL B DLL B DLL Z DLL Z DLL X DLL X 2nd Heap DLL C Thread 2 Process Heap Process Heap Main Thread Main Thread APP 2 APP 1 Reserved Reserved

29. 클라이언트/플러그인 드라이버

30. PCMCIA

31. USB

32. SDIO

33. Bluetooth

34. etc…

36. 클라이언트/플러그인 드라이버

37. PCMCIA

38. USB

39. SDIO

40. Bluetooth

41. etc…

43. Windows Mobile 6.1 11 2 GB :: User Space Slot 63 :: Resource-Only DLLs DLLs used exclusively by one process don’t take space from other processes Extra 64 MB of VM Slot 62 :: Shared Heap Area Slot 61 :: Read-Only FILE DLLs Slot 60 :: Read-Only FILE DLLs Slot 59 :: Device.exe Thread Stacks Slots 33-58 :: Large Memory Area Memory-Mapped Files Extra 8 MB of VM for Device Drivers Slots 2-32 :: Application Processes Slot 1 :: ROM FILE DLLs + MODULE DLLs Convert mshtml.dll to FILE DLL to free 6 MB of VM Slot 0 :: Alias of Active Process from Other Slots Overflow DLLs Reduce VM Space for All Processes

44. Windows Mobile 6.5 2 GB :: User Space Slot 63 :: Resource-Only DLLs Slot 62 :: Shared Heaps Faster MODULE DLLs whose VM is allocated at build time instead of runtime can go everywhere! Slot 61 :: FILE + MODULE DLLs Slot 60 :: FILE + MODULE DLLs Slot 59 :: Device.exe Thread Stacks Slots 33-58 :: Large Memory Area Memory-Mapped Files Process Threshold of 28 Slots 2-32 :: Application Processes Slot 1 :: ROM FILE DLLs + MODULE DLLs Slot 0 :: Alias of Active Process from Other Slots Overflow DLLs Reduce VM Space for All Processes

45. Windows Mobile 6.5Faster Performance JPEG images decode faster by aligning buffer size to 128-byte boundary needed by hardware Glyph Cache jumps from 8KB to 72KB for English and 128KB for Asian builds to boost font rendering speed GDI used to draw text one character at a time; now draws the entire string in one shot Switching Today screens and backgrounds repeatedly does not degrade device performance Paging Pool is set to a minimum of 15 MB to boost application load performance Minimum devices specs include a 400 MHz processor, 128 MB of RAM and 256 MB of ROM

47. Application Leak(1) AppVerifer실행 15

48. Application Leak(2) AppVerifer 클릭 “Connect…” Device Connection Windows 클릭 “Settings…” 16

49. Application Leak(3) CE Platform Manager 클릭 “Add Device” 이름을 변경 Properties 17

50. Application Leak(4) Device Properties에서 CESH Server… “OK” 18

51. Application Leak(5) Device Connection에서 클릭 “Connect…” KITL을 선택 “OK” 19

52. Application Leak(6) AppVerifer “Add…” Add Application  LeakApp.exe  “Open” 20

53. Application Leak(7) AppVerifer에서 “LeakApp.exe” “Heap Verifier” 체크 “Run” 21

54. Application Leak(8) LeakApp에서 Leak  Memory “Exit” 22

55. Application Leak(9) AppVerifer “Get Logs…” “View Exported Log…” “Open” 23

56. Application Leak(10) Exported Log “Potention Leak: 3 items (3072 bytes)…” 메모리 누수가 생긴 부분의 API나 함수 노출 24

57. Application Leak(11) Source Code 25 void Create_MemoryLeak( HWND hWnd ) { MessageBox(hWnd, _T("Create 1 KB (1024 bytes) memory leak"), _T("Leak App"), MB_OK); // LPBYTE p = (LPBYTE)LocalAlloc(LPTR, 1024); // //LocalFree((HLOCAL)p); }

58. 26 Question?