heap memory allocation

Common kernel memory allocation functions1)_get_free_pages is the most primitive memory allocation, to level two gets the original page box from the partner system, and the return value is the starting address of the first page box. _get_free_pages only encapsulates the alloc_pages function on the implementation , and

. In this case, there should be a clearer understanding of where the string values in the constant pool should be stored.When the program executes, the constant pool is stored in the method area, not the heap. Heap and Stack 　　The Java heap is a run-time data area in which objects allocate space. These objects are established through directives such as new, NewA

= 4G, ranging from 0x0000 0000 ~ 0 xFFFF FFFF. · NULL pointer Partition Range: 0x0000 0000 ~ 0x0000 FFFF Purpose: protect illegal Memory Access Example: If the memory allocation fails for some reason, a null pointer 0x0000 0000 is returned, the system will exit due to access violation. So why do we need such a large area? isn't an address value enough? I was won

Virtual ground is: Bootmem_data_t->node_bootmem_map2.3 Allocating memoryReserve_bootmem: Used to reserve physical pages. However, the memory allocation used for general purpose is low, it is mainly used for various drives (such as Video Codec) reserved memory.The usual memory allocation functions are as follows (in th

　　Java Memory allocation and management is one of the core technologies of java, before we introduced the Java memory management and memory leaks and Java garbage collection knowledge, today we go deep into the Java core, the detailed introduction of Java in memory

Java memory allocation and management is one of the core technologies of Java, before we introduced the Java memory management and memory leaks and Java garbage collection knowledge, today we go deep into the Java core, the detailed introduction of Java in memory

size of the user request, and the other is the remaining byte). Next, the memory assigned to the user is passed to the user, and the remaining piece, if any, is returned to the connection table. When the free function is invoked, it connects the memory blocks freed by the user to the idle chain. In the end, the free chain will be cut into a lot of small memory f

In the. NET Framework, resources in memory, which is a collection of all binary information, are categorized as managed resources and unmanaged resources. Managed resources must accept the management of the. NET Framework's CLR (Common language Runtime), such as memory type security checks, while unmanaged resources do not have to accept the CLR management of the. NET Framework. (See the. NET Framework or a

What is heap memory?We know that the size of the array defined in c/c ++ must be defined in advance. They are usually allocated in static memory or stack memory, however, in actual work, we sometimes need to dynamically allocate the size of the array, here in the c library malloc. the malloc () function in the h header

In the previous section, the memory overflow location in Java and the resolution of the Java Virtual machine stack and the method area of memory anomalies and processing methods are resolved, because the Java Virtual Machine management of the heap is very complex, and the Java Virtual machine in the most important memory