mmap 负责映射文件逻辑上一段连续的数据（物理上可以不连续存储）映射为连续内存，而这里的文件可以是磁盘...
The mmap() function shall establish a mapping between a process' address space and a file, shared memory object, or typed memory object. The format of the call is as follows: pa=mmap(addr, len, prot, flags, fildes, off); The
If offset off is valid, hat_getkpfnum(9F) is called to obtain the page frame number corresponding to this offset in the device's memory. In this example, xsp→regp→csr is a kernel virtual address which maps to device memory. ddi_regs_map_setup(9F) can be used to obtain this ...
Provided by: manpages-dev_6.8-2_all NAME mmap, munmap - map or unmap files or devices into memory LIBRARY Standard C library (libc, -lc) SYNOPSIS #include <sys/mman.h> void *mmap(void addr[.length], size_t length, int prot, int flags, int fd, off_t offset); int munmap(vo...
manpages-de-dev_4.13-4_all BEZEICHNUNG mmap, munmap - (un)mapt Dateien oder Geräte im Speicher ÜBERSICHT #include<sys/mman.h>void*mmap(void*Adr,size_tlaenge,intprot,intSchalter,intdd,off_tVersatz);intmunmap(void*Adr,size_tlaenge);Siehe ANMERKUNGEN für Informationen über Feature-Test...
MAP_NORESERVE是mmap的一个参数，MAN的说明是"Do not reserve swap space for this mapping. When swap space is reserved, one has the guarantee that it is possible to modify the mapping."。我们做个测试：场景A：物理内存+swap space: 16G，映射文件30G，使用一个进程进行mmap，成功后映射后持续写入数据 ...
官方文档:https://man7.org/linux/man-pages/man2/mmap.2.html 实验工具&环境 CPU:Intel(R) Xeon(R) Gold 5215 CPU @ 2.50GHz 磁盘:Intel P4510 SSD 系统版本:CentOS 7 内核版本:4.18.8 文件系统:ext4 性能分析工具:perf以及ftrace 内存大小:256GB ...
MAP_NORESERVE是mmap的一个参数,MAN的说明是"Do not reserve swap space for this mapping. When swap space is reserved, one has the guarantee that it is possible to modify the mapping."。 我们做个测试: 场景A:物理内存+swap space: 16G,映射文件30G,使用一个进程进行mmap,成功后映射后持续写入数据 ...
manpage里面的东西：void *mmap(void *start, size_t length, int prot, int flags,int fd, off_t offset);The mmap() function asks to map length bytes starting at offset offset from the file (or other object) specified by the file descriptor fd into memory,就是说，从offset...
再来看看man mmap给出的描述: mmap() creates a new mapping in the virtual address space of the calling process. The starting address for the new mapping is specified in addr. The length argument specifies the length of the mapping. 翻译:mmap函数创建一个当前进程虚拟地址空间的映射。开始的地址为...