原型：void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);...
[EINVAL] MAP_FIXED was specified and the addr argument was not page aligned, or part of the desired address space resides out of the valid address space for a user process. [EINVAL] The len argument was equal to zero. [EINVAL] MAP_ANON was specified and the fd argument was not -1. ...
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...
pid为5161. [root@localhost 5161]# ls attr cpuset latency mountstats root statm auxv cwd limits net sched status cgroup environ loginuid numa_maps schedstat syscall clear_refs exe maps oom_adj sessionid task cmdline fd mem oom_score smaps wchan comm fdinfo mountinfo pagemap stack coredump_filt...
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 ...
https://man7.org/linux/man-pages/man2/mmap.2.html 简单来说: mmap() 系统调用能够将文件映射到内存空间,然后可以通过读写内存来读写文件 mmap 函数 #include <sys/mman.h>void *mmap(void *addr, size_t length, int prot, int flags,int fd, off_t offset); ...
内存分配:在使用malloc分配内存时,如果请求内存的大小大于M_MMAP_THRESHOLD,则直接使用mmap进行内存分配。(目前, glibc库会动态调整M_MMAP_THRESHOLD的大小,详见mallopt man page) mmap实现 mmap与文件系统的关系 基于文件的内存映射必然与文件系统的联系比较大,其中最关键的就是PageCache(页高速缓存)。PageCache一方面是...
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...
https://man7.org/linux/man-pages/man2/mmap.2.html 简单来说: mmap() 系统调用能够将文件映射到内存空间,然后可以通过读写内存来读写文件 mmap 函数 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #includevoid*mmap(void*addr,size_t length,int prot,int flags,int fd,off_t offset); ...
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 ...