Mercurial > hg > nginx
annotate src/os/unix/ngx_shmem.c @ 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> |
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date | Mon, 27 Dec 2021 19:48:33 +0300 |
parents | d620f497c50f |
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rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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11 |
469 | 12 #if (NGX_HAVE_MAP_ANON) |
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13 |
605 | 14 ngx_int_t |
15 ngx_shm_alloc(ngx_shm_t *shm) | |
358
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16 { |
639 | 17 shm->addr = (u_char *) mmap(NULL, shm->size, |
18 PROT_READ|PROT_WRITE, | |
19 MAP_ANON|MAP_SHARED, -1, 0); | |
358
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20 |
605 | 21 if (shm->addr == MAP_FAILED) { |
22 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
23 "mmap(MAP_ANON|MAP_SHARED, %uz) failed", shm->size); | |
24 return NGX_ERROR; | |
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25 } |
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26 |
605 | 27 return NGX_OK; |
28 } | |
29 | |
30 | |
31 void | |
32 ngx_shm_free(ngx_shm_t *shm) | |
33 { | |
639 | 34 if (munmap((void *) shm->addr, shm->size) == -1) { |
605 | 35 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
36 "munmap(%p, %uz) failed", shm->addr, shm->size); | |
37 } | |
358
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38 } |
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39 |
469 | 40 #elif (NGX_HAVE_MAP_DEVZERO) |
358
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41 |
605 | 42 ngx_int_t |
43 ngx_shm_alloc(ngx_shm_t *shm) | |
358
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44 { |
605 | 45 ngx_fd_t fd; |
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46 |
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47 fd = open("/dev/zero", O_RDWR); |
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48 |
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49 if (fd == -1) { |
605 | 50 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
467 | 51 "open(\"/dev/zero\") failed"); |
605 | 52 return NGX_ERROR; |
358
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53 } |
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54 |
639 | 55 shm->addr = (u_char *) mmap(NULL, shm->size, PROT_READ|PROT_WRITE, |
56 MAP_SHARED, fd, 0); | |
358
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57 |
605 | 58 if (shm->addr == MAP_FAILED) { |
59 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
60 "mmap(/dev/zero, MAP_SHARED, %uz) failed", shm->size); | |
358
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61 } |
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62 |
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63 if (close(fd) == -1) { |
605 | 64 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
467 | 65 "close(\"/dev/zero\") failed"); |
358
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66 } |
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67 |
605 | 68 return (shm->addr == MAP_FAILED) ? NGX_ERROR : NGX_OK; |
69 } | |
70 | |
71 | |
72 void | |
73 ngx_shm_free(ngx_shm_t *shm) | |
74 { | |
639 | 75 if (munmap((void *) shm->addr, shm->size) == -1) { |
605 | 76 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
77 "munmap(%p, %uz) failed", shm->addr, shm->size); | |
78 } | |
358
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79 } |
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80 |
469 | 81 #elif (NGX_HAVE_SYSVSHM) |
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82 |
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83 #include <sys/ipc.h> |
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84 #include <sys/shm.h> |
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85 |
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86 |
605 | 87 ngx_int_t |
88 ngx_shm_alloc(ngx_shm_t *shm) | |
358
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89 { |
605 | 90 int id; |
358
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91 |
605 | 92 id = shmget(IPC_PRIVATE, shm->size, (SHM_R|SHM_W|IPC_CREAT)); |
358
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93 |
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94 if (id == -1) { |
605 | 95 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
96 "shmget(%uz) failed", shm->size); | |
97 return NGX_ERROR; | |
358
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98 } |
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99 |
605 | 100 ngx_log_debug1(NGX_LOG_DEBUG_CORE, shm->log, 0, "shmget id: %d", id); |
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101 |
605 | 102 shm->addr = shmat(id, NULL, 0); |
103 | |
104 if (shm->addr == (void *) -1) { | |
105 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, "shmat() failed"); | |
358
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106 } |
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107 |
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108 if (shmctl(id, IPC_RMID, NULL) == -1) { |
605 | 109 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
110 "shmctl(IPC_RMID) failed"); | |
358
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111 } |
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112 |
605 | 113 return (shm->addr == (void *) -1) ? NGX_ERROR : NGX_OK; |
114 } | |
115 | |
116 | |
117 void | |
118 ngx_shm_free(ngx_shm_t *shm) | |
119 { | |
120 if (shmdt(shm->addr) == -1) { | |
121 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
122 "shmdt(%p) failed", shm->addr); | |
123 } | |
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124 } |
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125 |
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126 #endif |