Unix/Linux系統調用
accept()函數 Unix/Linux
access()函數 Unix/Linux
acct()函數 Unix/Linux
add_key()函數 Unix/Linux
adjtimex()函數 Unix/Linux
afs_syscall()函數 Unix/Linux
alarm()函數 Unix/Linux
alloc_hugepages()函數 Unix/Linux
arch_prctl()函數 Unix/Linux
bdflush()函數 Unix/Linux
bind()函數 Unix/Linux
break未實現 Unix/Linux
brk()函數 Unix/Linux
cacheflush()函數 Unix/Linux
chdir()函數 Unix/Linux
chmod()函數 Unix/Linux
chown()函數 Unix/Linux
chroot()函數 Unix/Linux
clone()函數 Unix/Linux
close()函數 Unix/Linux
connect()函數 Unix/Linux
create_module()函數 Unix/Linux
open()函數 Unix/Linux
dup2()函數 Unix/Linux
dup()函數 Unix/Linux
epoll_create()函數 Unix/Linux
epoll_ctl()函數 Unix/Linux
epoll_wait()函數 Unix/Linux
execve()函數 Unix/Linux
exit_group函數 Unix/Linux
_exit()函數 Unix/Linux
exit()函數 Unix/Linux
faccessat()函數 Unix/Linux
fattach()函數 Unix/Linux
fchdir()函數 Unix/Linux
fchmodat()函數 Unix/Linux
fchmod()函數 Unix/Linux
fchownat()函數 Unix/Linux
fchown()函數 Unix/Linux
fcntl()函數 Unix/Linux
fdatasync()函數 Unix/Linux
fdetach()函數 Unix/Linux
flock()函數 Unix/Linux
fork()函數 Unix/Linux
alloc_hugepages()函數 Unix/Linux
fstatat()函數 Unix/Linux
statfs()函數 Unix/Linux
stat()函數 Unix/Linux
statvfs()函數 Unix/Linux
fsync()函數 Unix/Linux
truncate()函數 Unix/Linux
futex()函數 Unix/Linux
futimesat()函數 Unix/Linux
getcontext()函數 Unix/Linux
getcwd()函數 Unix/Linux
getdents()函數 Unix/Linux
getdomainname()函數 Unix/Linux
getdtablesize()函數 Unix/Linux
getgid()函數 Unix/Linux
getuid()函數 Unix/Linux
getgroups()函數 Unix/Linux
getgroups()函數 Unix/Linux
gethostname()函數 Unix/Linux
getitimer()函數 Unix/Linux
get_kernel_syms()函數 Unix/Linux
unimplemented()函數 Unix/Linux
getpagesize()函數 Unix/Linux
getpeername()函數 Unix/Linux
setpgid()函數 Unix/Linux
getpgrp()函數 Unix/Linux
getpid()函數 Unix/Linux
getpmsg()函數 Unix/Linux
getppid()函數 Unix/Linux
getpriority()函數 Unix/Linux
getresuid()函數 Unix/Linux
getrlimit()函數 Unix/Linux
get_robust_list()函數 Unix/Linux
getrusage()函數 Unix/Linux
getsid()函數 Unix/Linux
getsockname()函數 Unix/Linux
getsockopt()函數 Unix/Linux
get_thread_area()函數 Unix/Linux
gettid()函數 Unix/Linux
gettimeofday()函數 Unix/Linux
getuid()函數 Unix/Linux
getunwind()函數 Unix/Linux
gtty()函數 Unix/Linux
idle()函數 Unix/Linux
outb()函數 Unix/Linux
inb_p()函數 Unix/Linux
inl()函數 Unix/Linux
inl_p()函數 Unix/Linux
inotify_add_watch()函數 Unix/Linux
inotify_init()函數 Unix/Linux
inotify_rm_watch()函數 Unix/Linux
outb()函數 Unix/Linux
insl()函數 Unix/Linux
insw()函數 Unix/Linux
intro()函數 Unix/Linux
inw()函數 Unix/Linux
inw_p()函數 Unix/Linux
io_cancel()函數 Unix/Linux
ioctl()函數 Unix/Linux
ioctl_list()函數 Unix/Linux
io_destroy()函數 Unix/Linux
io_getevents()函數 Unix/Linux
ioperm()函數 Unix/Linux
iopl()函數 Unix/Linux
ioprio_set()函數 Unix/Linux
io_setup()函數 Unix/Linux
io_submit()函數 Unix/Linux
ipc()函數 Unix/Linux
isastream()函數 Unix/Linux
kexec_load()函數 Unix/Linux
keyctl()函數 Unix/Linux
kill()函數 Unix/Linux
killpg()函數 Unix/Linux
lchown()函數 Unix/Linux
linkat()函數 Unix/Linux
link()函數 Unix/Linux
listen()函數 Unix/Linux
_llseek()函數 Unix/Linux
llseek()函數 Unix/Linux
lock()函數 Unix/Linux
lookup_dcookie()函數 Unix/Linux
lseek()函數 Unix/Linux
lstat()函數 Unix/Linux
madvise()函數 Unix/Linux
mincore()函數 Unix/Linux
mkdirat()函數 Unix/Linux
mkdir()函數 Unix/Linux
mknod()函數 Unix/Linux
mlockall()函數 Unix/Linux
mlock()函數 Unix/Linux
mmap2()函數 Unix/Linux
mmap()函數 Unix/Linux
modify_ldt()函數 Unix/Linux
mount()函數 Unix/Linux
move_pages()函數 Unix/Linux
mprotect()函數 Unix/Linux
mpx()函數 Unix/Linux
mq_getsetattr()函數 Unix/Linux
mremap()函數 Unix/Linux
msgctl()函數 Unix/Linux
msgget()函數 Unix/Linux
msgop()函數 Unix/Linux
msgsnd()函數 Unix/Linux
msync()函數 Unix/Linux
multiplexer()函數 Unix/Linux
munlockall()函數 Unix/Linux
munlock()函數 Unix/Linux
munmap()函數 Unix/Linux
nanosleep()函數 Unix/Linux
_newselect()函數 Unix/Linux
nfsservctl()函數 Unix/Linux
nice()函數 Unix/Linux
obsolete()函數 Unix/Linux
oldfstat()函數 Unix/Linux
oldlstat()函數 Unix/Linux
oldolduname()函數 Unix/Linux
oldstat()函數 Unix/Linux
olduname()函數 Unix/Linux
openat()函數 Unix/Linux
open()函數 Unix/Linux
outb()函數 Unix/Linux
outb_p()函數 Unix/Linux
outsb()函數 Unix/Linux
outsl()函數 Unix/Linux
outsw()函數 Unix/Linux
outw()函數 Unix/Linux
outw_p()函數 Unix/Linux
path_resolution()函數 Unix/Linux
pause()函數 Unix/Linux
perfmonctl()函數 Unix/Linux
personality()函數 Unix/Linux
pipe()函數 Unix/Linux
pivot_root()函數 Unix/Linux
poll()函數 Unix/Linux
posix_fadvise()函數 Unix/Linux
ppoll()函數 Unix/Linux
prctl()函數 Unix/Linux
pread()函數 Unix/Linux
prof()函數 Unix/Linux
pselect()函數 Unix/Linux
ptrace()函數 Unix/Linux
putmsg()函數 Unix/Linux
putpmsg()函數 Unix/Linux
pwrite()函數 Unix/Linux
query_module()函數 Unix/Linux
quotactl()函數 Unix/Linux
readahead()函數 Unix/Linux
readdir()函數 Unix/Linux
read()函數 Unix/Linux
readlinkat()函數 Unix/Linux
readlink()函數 Unix/Linux
readv()函數 Unix/Linux
reboot()函數 Unix/Linux
recvfrom()函數 Unix/Linux
recv()函數 Unix/Linux
recvmsg()函數 Unix/Linux
remap_file_pages()函數 Unix/Linux
renameat()函數 Unix/Linux
rename()函數 Unix/Linux
request_key()函數 Unix/Linux
rmdir()函數 Unix/Linux
sbrk()函數 Unix/Linux
sched_setaffinity()函數 Unix/Linux
sched_getparam()函數 Unix/Linux
sched_get_priority_max()函數 Unix/Linux
sched_get_priority_min()函數 Unix/Linux
sched_setscheduler()函數 Unix/Linux
sched_rr_get_interval()函數 Unix/Linux
sched_setparam()函數 Unix/Linux
sched_yield()函數 Unix/Linux
security()函數 Unix/Linux
select()函數 Unix/Linux
select_tut()函數 Unix/Linux
semctl()函數 Unix/Linux

alloc_hugepages()函數 Unix/Linux

alloc_hugepages, free_hugepages - 分配或釋放巨大的頁面

內容簡介

void *alloc_hugepages(int key**, void *addr, size_t** len**,** int prot**, int** flag**);**
int free_hugepages(void **addr*);

描述

The system calls alloc_hugepages() and free_hugepages() were introduced in Linux 2.5.36 and removed again in 2.5.54. They existed only on i386 and ia64 (when built with CONFIG_HUGETLB_PAGE). In Linux 2.4.20 the syscall numbers exist, but the calls return ENOSYS.

On i386 the memory management hardware knows about ordinary pages (4 KiB) and huge pages (2 or 4 MiB). Similarly ia64 knows about huge pages of several sizes. These system calls serve to map huge pages into the process’ memory or to free them again. Huge pages are locked into memory, and are not swapped.

The key parameter is an identifier. When zero the pages are private, and not inherited by children. When positive the pages are shared with other applications using the samekey, and inherited by child processes.

The addr parameter of free_hugepages() tells which page is being freed: it was the return value of a call to alloc_hugepages(). (The memory is first actually freed when all users have released it.) The addr parameter of alloc_hugepages() is a hint, that the kernel may or may not follow. Addresses must be properly aligned.

The len parameter is the length of the required segment. It must be a multiple of the huge page size.

The prot parameter specifies the memory protection of the segment. It is one of PROT_READ, PROT_WRITE, PROT_EXEC.

The flag parameter is ignored, unless key is positive. In that case, if flag is IPC_CREAT, then a new huge page segment is created when none with the given key existed. If this flag is not set, then ENOENT is returned when no segment with the given key exists.

返回值

On success, alloc_hugepages() returns the allocated virtual address, andfree_hugepages() returns zero. On error, -1 is returned, and errno is set appropriately.

錯誤

標籤

描述

ENOSYS

The system call is not supported on this kernel.

遵循於

These calls existed only in Linux 2.5.36 through to 2.5.54. These calls are specific to Linux on Intel processors, and should not be used in programs intended to be portable. Indeed, the system call numbers are marked for reuse, so programs using these may do something random on a future kernel.

文件

/proc/sys/vm/nr_hugepages Number of configured hugetlb pages. This can be read and written.

/proc/meminfo Gives info on the number of configured hugetlb pages and on their size in the three variables HugePages_Total, HugePages_Free, Hugepagesize.

注意

The system calls are gone. Now the hugetlbfs filesystem can be used instead. Memory backed by huge pages (if the CPU supports them) is obtained by using mmap() to map files in this virtual filesystem.

The maximal number of huge pages can be specified using the hugepages= boot parameter.