embedded从入门到精通系列课程4windows ce5.0mobile调试与性能优化

WindowsEmbedded从 到精通系列课程

WindowsEmbeddedCE

Windows

调试与性能优化

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本次课程内容包括

CEand

ArchitectureOverview

DebuggingTips

Performance&Profiler

CEand Overview

MemoryLayout

Hint:RegisterWindow

WindowsCEVirtualMemoryReview

32-bitOS–

possible

TophalfusedbyKernel

BottomhalfusedbyUser

WindowsCEVirtualMemoryReview

Abovetheprocessslotsisasharedareaforlarge

VirtualAllocsandmemorymappedfiles

WindowsCEVirtualMemoryReview

32MBProcessslotstake

thelowestaddresses

Slot32

KernelSpae

Slot2

Slot1

UserProcessSpace

Slot0

ProcessSlot

0x01FFFFFF

DLLVirtualMemoryAllocations

RAMDLL+OverflowROMDLL:Code+Data

GeneralVirtualMemoryAllocations

ThreadStack

ThreadStack

0x00010000

GuardSection(64k)+UserKInfo

0x00000000

ProcessCode+Data

ProcessHeap

ProcessVirtualAlloc()calls

ROMDLLs:R/WData

32MBProcessslotissharedbyDLL,process,andallofitsvirtualallocations

Allvirtualallocationsare

64kB-aligned

Pagesmaybecommittedwithinavirtualallocationonapagegranularity(4kB)

DLLallocationsinaslotstartathighaddressesandgrowdown

Processandgeneralallocationsstartatlowaddressesandgrowup

9

Debuggingtips

Whatdowelearnfromthememorylayout?

HexAddressAnatomy

64KBalignment.

(VirtualAllocs,DLLalignment

andStackslot)

Hexaddresseshaveidentifiablepositions:

High/Low2GBUser“lessthan”8Kernel“greaterthan”8

MegabyteAlignment

PageAlign

Slotalignment

HexAddressAnatomy

Position1(inyellow) lsyouifitskernel

spaceoruserspace8andaboveiskernelBelow8isUserspace

HexAddressAnatomy

Position2(inred)isprocessslotpositionIfslotnumberisodd,address

islikelyaDLL

Ifslotnumberiseven,

addressislikelyanapp

Slot32

Slot2

Slot1

Slot0

HexAddressAnatomy

32MBinhexis:0x02000000

16MBUpper

32MBslot

MegabyteAlignment 16MBLower

HexAddressAnatomy

Position4(incyan)is64kbalignment

DLLalignment

Stackalignment

64KBalignment.(VirtualAllocs,DLLalignment

andStackslot)

HexAddressAnatomy

Position5(ingray)ispage(4kb)alignment

16pages==64kb

PageAlign

HexAddressAnatomy

64KBalignment.

(VirtualAllocs,DLLalignment

andStackslot)

Letstakeanotherlook

High/Low2GBUser“lessthan”8Kernel“greaterthan”8

MegabyteAlignment

PageAlign

Slotalignment

ThinkinginHexQuiz1

Whatisthedifferencebetween:

0x

and

0x0A119235??

Extracredit:Whatdoyouthinkitpointsto?

ThinkinginHex(Answer1)

Sameaddress!

Seconditisbeingviewedoutsidetsprocessslot.

0x

0x0A119235

1MB ppe

32MBslot

High/Low2GBUser“lessthan”8Kernel“greaterthan”8

0x

MegabyteAlignment

PageAlign

1 BLower

64KBalignment.(VirtualAllocs,DLLalignment

Slotalignment andStackslot)

“MostLikely”codeorglobal

ThinkinginHex(Quiz2)

?

Whatis:

0x019ABCDE

ThinkinginHex(Answer2)

0x019ABCDEis“mostlikely”

CODEfromaDLL.

16MBUppe

0x019ABCDE

6MBLowr

32MBslot

VisuallyDebuggingCallStacks

Stacksgrowfromhighertoloweraddresses

DefaultsizeofARMstackis64KBandtheyarealways

64KBaligned.Thismeansthatthe“topfunctions”of

astackwillbelocatedver closetoa64KBboundar.

WindowsCEalsoemlosthenotionoftwosearate

4KBguardpagesthatthrowexceptionsifentered

VisualStackInspection#1

StackPointer“dipped”intofirstguardpage

Stackoverflow

UnderstandingException

AKY"AccessKey“

PC

"ProgramCounter”

ESP/SP“StackPointer”

ESP-EA-RA-FSRareCPUspecifiedregisterorMMUregister

Backtoaddresstopic:0x f

Dataorcodefailed!

Usings

.exetocollect

runtimeInformation

gicommand

gi["proc","thrd","mod","all"]*["<pattern>"]:GetInformation

proc ->Listsallprocessesinthesystem

thrd ->Listsallprocesseswiththeirthreads

delta->ListsonlythreadsthathavechangesinCPUtimes

DEMO

TargetControlDebugging

ProfilerandOptimization

Optimizewhat?

Howcouldwecollectthe

runtimeinformation?

PerformanceOptimization

Whatisbottle-neckofthesystem?

WhichmodulecostmostCPUtime?

Beforeoptimizethesystem,Weneedtoknowhowdoesthesystemrunning

Whicheventcausesystemblocking？

KernelProfiler

Whatistheprofilermean?

DataCollection

TimeBased

– MonteCarlo(time-basedsampling)CallBased

SystemCalls(call-based)

MonteCarlo

Highresolutiontimerasthe“Hit”

InterruptstheOSperiodicallyandsamplesthePC

voidProfilerHit(DWORDra);

SystemCalls

hitsintheObjectCallfunctioninthekernel

SystemcallprofilingmonitorsthisObjectCallfunction

RemoteKerneltracker

CaptureOSeventsastheyhappen

Threadandprocesscreation/execution/PRIO

Synchronizationobjects

Interrupts

Memory,paging,TLBmisses

Loaderevents

Bootevents

ExaminingThreadBehavior

RemoteKerneltracker

DEMO

UsingRemoteKernelTracker

Profilingfunctioncall

PSLhappensonlyinAPIcall

Normallyfunctioncallwon’tcausePSL

Complieraddedfunctionbelowtotrackingfunctioncall

void stdcall_CAP_Enter_Function(void

*pfn);

void stdcall_CAP_Exit_Function(void*pfn);

ProfilingCode

RemoteCallProfiler

DEMO

UsingRemoteCallProfiler

Summary

Makeyourdevicebetter!

嵌入式开发资源

WindowsEmbedded中文

http:/ / /windows/embedded

.NETMicroFramework

http://m

/embedded/bb267253.aspx

RoboticsStudio

http://m

/robotics/default.aspx

微软嵌入式开发者

/ /default.aspx?ForumGroupID=493&

SiteID=15

微软中国嵌入式开发者博客

htt /yunxu/

MikeHall的博客

http://m /embedded/

Aa731228.aspx

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