Reader ´ Understanding the Linux Virtual Memory Manager 752pages ↠ Danpashley

Pdf ↠ Understanding the Linux Virtual Memory Manager À Mel Gorman

Pdf ↠ Understanding the Linux Virtual Memory Manager À Mel Gorman Lso one of the most poorly understood and badly documented subsystems in Linux partially because there is uite literally so much of it It is very difficult to isolate and understand individual parts of the code without first having a strong conceptual model of the whole VM so this book intends to give a detailed description of what to expect before going to the source This material should be of prime interest to new developers who want to adapt the VM to their needs and to readers who simply would like to know how the VM works It also will benefit other subsystem developers who want to get the most from the VM when they interact with it and operating systems researchers looking for details on how memory management is implemented in a modern operating system For others who just want to learnabout a subsystem that is the focus of so much discussion they will find an easy to read description of the VM functionality that covers all the details without the need to plow through source code However it is assumed that the reader has read at least one general operating system book or one general Linux kernel orientated book and has a general knowledge of C before tackling this book Although every effort is made to make the material approachable some prior knowledge of general operating systems is assumed Book Overview In Chapter 1 we go into detail on how the source code may be managed and deciphered Three tools are introduced that are used for analysis easy browsing and management of code The main tools are the Linux Cross Referencing LXR tool which allows source code to be browsed as a Web page and CodeViz which was developed while researching this book for generating call graphs The last tool PatchSet is for managing kernels and the application of patches Applying patches manually can be time consuming and using version control software such as Concurrent Versions Systems CVS or BitKeeperis not always an option With PatchSet a simple specification file determines what source to use what patches to apply and what kernel configuration to use In the subseuent chapters each part of the Linux VM implementation is discussed in detail such as how memory is described in an architecture independent manner how processes manage their memory how the specific allocators work and so on Each chapter will refer to other sources that describe the behavior of Linux as well as covering in depth the implemen

Doc Understanding the Linux Virtual Memory Manager

Reader ´ Understanding the Linux Virtual Memory Manager 752pages ↠ Danpashley Õ ✅ [PDF / Epub] ☉ Understanding the Linux Virtual Memory Manager By Mel Gorman ⚣ – Danpashley.co.uk Preface Linux is developed with a stronger practical emphasis than a theoretical one Wh Tation the functions used and their call graphs so that the reader will have a clear view of how the code is structured The end of each chapter has a What's New section which introduces what to expect in the 26 VM The appendices are a code commentary of a significant percentage of the VM They give a line by line description of some of thecomplex aspects of the VM The style of the VM tends to be reasonably consistent even between major releases of the kernel so an in depth understanding of the 24 VM will be an invaluable aid to understanding the 26 kernel when it is released Companion CD A companion CD is included with this book and it is highly recommended the reader become familiar with it especially as you progressthrough the book and are using the code commentary It is recommended that the CD is used with a GNULinux system but it is not reuired The text of the book is contained on the CD in HTML PDF and plain text formats so the reader can perform basic text searches if the index does not have the desired information If you are reading therst edition of the book you may notice small differences between the CD version and the paper version due to printing deadlines but the differences are minor Almost all the tools used to research the book's material are contained on the CD Each of the tools may be installed on virtually any GNULinux installation references are included to available documentation and the project home sites so you can check for further updates With many GNULinux installations there is the additional bonus of being able to run a Web server directly from the CD The server has been tested with Red Hat 73 and Debian Woody but should work with any distribution The small Web site it provides at offers a number of useful features A searchable index for functions that have a code commentary available If a function is searched for that does not have a commentary the browser will be automatically redirected to LXR A Web browsable copy of the Linux 2422 source This allows code to be browsed and identifiers to be searched for A live version of CodeViz the tool used to generate call graphs for the book is available If you feel that the book's graphs are lacking some detail you want generate them yourself The VMRegress CodeViz and PatchSet packages which are discussed in Chapter 1 are available in cdromsoftware gcc 304 is also provided because it is reuired for building CodeViz

Mel Gorman À Understanding the Linux Virtual Memory Manager Text

Understanding the Linux Virtual Memory ManagerPreface Linux is developed with a stronger practical emphasis than a theoretical one When new algorithms or changes to existing implementations are suggested it is common to reuest code to match the argument Many of the algorithms used in the Virtual Memory VM system were designed by theorists but the implementations have now diverged considerably from the theory In part Linux does follow the traditional development cycle of design to implementation but changes made in reaction to how the system behaved in the real world and intuitive decisions by developers arecommon This means that the VM performs well in practice However very little VM documentation is available except for a few incomplete overviews on a small number of Web sites except the Web site containing an earlier draft of this book of course This lack of documentation has led to the situation where the VM is fully understood only by a small number of core developers New developers looking for information on how VM functions are generally told to read the source Little or no information is available on the theoretical basis for the implementation This reuires that even a casual observer invest a large amount of time reading the code and studying the field of Memory Management This book gives a detailed tour of the Linux VM as implemented in 2422 and gives a solid introduction of what to expect in 26 As well as discussing the implementation the theory that Linux VM is based on will also be introduced This is not intended to be a memory management theory book but understanding why the VM is implemented in a particular fashion is often much simpler if the underlying basis is known in advance To complement the description the appendices include a detailed code commentary on a significant percentage of the VM This should drastically reduce the amount of time a developer or researcher needs to invest in understanding what is happening inside the Linux VM because VM implementations tend to follow similar code patterns even between major versions This means that with a solid understanding of the 24 VM the later 25 development VMs and the 26 final release will be decipherable in a number of weeks The Intended Audience Anyone interested in how the VM a core kernel subsystem works will find answers to many of their uestions in this book The VMthan any other subsystem affects the overall performance of the operating system The VM is a