Mercurial > hg > nginx
view src/os/unix/ngx_linux_config.h @ 7985:ec2e6893caaa
Simplified sendfile(SF_NODISKIO) usage.
Starting with FreeBSD 11, there is no need to use AIO operations to preload
data into cache for sendfile(SF_NODISKIO) to work. Instead, sendfile()
handles non-blocking loading data from disk by itself. It still can, however,
return EBUSY if a page is already being loaded (for example, by a different
process). If this happens, we now post an event for the next event loop
iteration, so sendfile() is retried "after a short period", as manpage
recommends.
The limit of the number of EBUSY tolerated without any progress is preserved,
but now it does not result in an alert, since on an idle system event loop
iteration might be very short and EBUSY can happen many times in a row.
Instead, SF_NODISKIO is simply disabled for one call once the limit is
reached.
With this change, sendfile(SF_NODISKIO) is now used automatically as long as
sendfile() is enabled, and no longer requires "aio on;".
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 27 Dec 2021 19:48:33 +0300 |
| parents | 56923e8e01a5 |
| children | c0a432c0301b |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_LINUX_CONFIG_H_INCLUDED_ #define _NGX_LINUX_CONFIG_H_INCLUDED_ #ifndef _GNU_SOURCE #define _GNU_SOURCE /* pread(), pwrite(), gethostname() */ #endif #define _FILE_OFFSET_BITS 64 #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <stdarg.h> #include <stddef.h> /* offsetof() */ #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <errno.h> #include <string.h> #include <signal.h> #include <pwd.h> #include <grp.h> #include <dirent.h> #include <glob.h> #include <sys/vfs.h> /* statfs() */ #include <sys/uio.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/wait.h> #include <sys/mman.h> #include <sys/resource.h> #include <sched.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> /* TCP_NODELAY, TCP_CORK */ #include <arpa/inet.h> #include <netdb.h> #include <sys/un.h> #include <time.h> /* tzset() */ #include <malloc.h> /* memalign() */ #include <limits.h> /* IOV_MAX */ #include <sys/ioctl.h> #include <crypt.h> #include <sys/utsname.h> /* uname() */ #include <dlfcn.h> #include <ngx_auto_config.h> #if (NGX_HAVE_POSIX_SEM) #include <semaphore.h> #endif #if (NGX_HAVE_SYS_PRCTL_H) #include <sys/prctl.h> #endif #if (NGX_HAVE_SENDFILE64) #include <sys/sendfile.h> #else extern ssize_t sendfile(int s, int fd, int32_t *offset, size_t size); #define NGX_SENDFILE_LIMIT 0x80000000 #endif #if (NGX_HAVE_POLL) #include <poll.h> #endif #if (NGX_HAVE_EPOLL) #include <sys/epoll.h> #endif #if (NGX_HAVE_SYS_EVENTFD_H) #include <sys/eventfd.h> #endif #include <sys/syscall.h> #if (NGX_HAVE_FILE_AIO) #include <linux/aio_abi.h> typedef struct iocb ngx_aiocb_t; #endif #if (NGX_HAVE_CAPABILITIES) #include <linux/capability.h> #endif #define NGX_LISTEN_BACKLOG 511 #ifndef NGX_HAVE_SO_SNDLOWAT /* setsockopt(SO_SNDLOWAT) returns ENOPROTOOPT */ #define NGX_HAVE_SO_SNDLOWAT 0 #endif #ifndef NGX_HAVE_INHERITED_NONBLOCK #define NGX_HAVE_INHERITED_NONBLOCK 0 #endif #define NGX_HAVE_OS_SPECIFIC_INIT 1 #define ngx_debug_init() extern char **environ; #endif /* _NGX_LINUX_CONFIG_H_INCLUDED_ */