virtual memory paging

these two types of addresses?The reason for personal sleep is that the logical address assignment is more flexible, can be allowed not unique, it seems more intuitive, for example, a section of code allocation of arrays, logical addresses are contiguous, but on the physical address, the array occupied by the page may be scattered, the physical address is discontinuous, so that the program can be understandable impact. In addition, with the concept of logical address,

at the software level of the construction of virtual address, eventually to be converted through MMU to physical address, that is, regardless of how the Linux paging mechanism is implemented, the CPU only according to its paging implementation to interpret the linear address, so Linux to the CPU's linear address is necessarily to meet the hardware implementation

When it comes to virtual memory, it involves paging file (Pagefile.sys), the so-called paging file, its function is to set a part of the hard disk space to virtual memory, thereby expanding the available "

NT Memory System Overview Windows NT uses a page-based virtual memory system that uses a 32-bit linear address. Internally, the system manages all the memory in the 4096-byte segment called the page. Is the physical memory on each page backed up? /Font> Use pagefile for tem

the MMU is to replace the physical address with the virtual address, that is, when the CPU is addressing, and the MMU is responsible for mapping the virtual address to physical addresses.The introduction of the MMU solves the limitation of physical memory, which is the same as using 4G memory for the program.Memory

Class Object Memory layout, virtual functions, virtual inheritance and multi-inheritance Implementation Mechanism 1. classes without inheritance relationships 2. Single inheritance 2.1 single-layer inheritance 2.2 multi-Inheritance 3. Multi-Inheritance 1. classes without inheritance relationships Class A and Class B are known. Class A represents A class without

is 0~0xffffffffffffffff. This range is the range of addresses that the program can generate, which is called the virtual address space, where an address is called a virtual address. Third, address mapping Most systems that use virtual storage are using a technique called paging. The

addressing. They correspond to the electrical signals sent to the memory bus from the address pins of the microprocessor. A physical address is represented by a 32-bit or 36-bit unsigned integer. (In fact, this is the best understanding, is the real address)PS: As you can see in the explanations below, logical addresses are sometimes treated as virtual addresses, but in "deep understanding of the Linux ker

0x00000000 to 0xFFFFFFFF.Physical addresses (physical address)For memory chip-level memory unit addressing. They correspond to the electrical signals sent to the memory bus from the address pins of the microprocessor. A physical address is represented by a 32-bit or 36-bit unsigned integer. (In fact, this is the best understanding, is the real address)PS: As you

Introduction??This chapter is about the memory area of the Java virtual machine can be divided into several parts, the book can be divided into five parts: heap, Stack, program counter, method area, local method stack??Where the heap contains an instance of the object??And often said the basic data type, and the object reference is stored in the stack, in fact, is actually stored in the

cell addressing. They correspond to the electrical signals sent from the microprocessor's address pins to the memory bus. The physical address is represented by a 32-bit or 36-bit unsigned integer. (In fact, this is the best understanding, is the real address) (PS: As you can see in the explanations below, you sometimes think of a logical address as a virtual address, but the linear address is considered a

Physical memory is the size of the memory bar that we plug into the memory slot on the motherboard. Look at the computer configuration, the main look is this physical memory. General memory size is 1G, 2G, 4G. As shown in the following illustration:

"Deep Java Virtual machine": Java memory area and memory overflow memory areaThe Java Virtual machine divides the memory he manages into several different data regions during the execution of a Java program. The Java

??This phrase feels like the nature of the GC .??????1. Procedure Counter (program Counter Register)??A program counter is a small amount of memory space that acts as a line number indicator of the bytecode that is being executed by the current thread . The bytecode interpreter works by changing the value of this counter to select the next byte-code instruction to execute, and the basic functions such as branching, looping, jumping, exception handling

The memory size calculation of the class in the case of virtual inheritanceWhen there are multiple virtual functions in each base class, and in the case of virtual inheritance, how the memory is allocated and how the class size is computed, the following example illustrates:

Setting up virtual memory in a Windows XP system is very inconspicuous and is automatically set up when Windows XP is installed, and users do not have to bother with it. However, virtual memory, as a supplement and extension of physical memory, plays an important role in the

been moved from the 0x100000 to the 1MB address starting at 0, and the memory in the main function is set to no more than 16MB, so take 16MB memory as an example; the entire memory distribution is: Kernel code and system data use 0~1MB- ----Cache uses 1~4MB------virtual memory