Commit | Line | Data |
---|---|---|
8b3bd7a3 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2012 EfficiOS Inc. |
8b3bd7a3 | 3 | * |
c922647d | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
8b3bd7a3 | 5 | * |
8b3bd7a3 SM |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
8b3bd7a3 SM |
9 | #include <stddef.h> |
10 | #include <unistd.h> | |
1a1a34b4 MJ |
11 | #include <stdbool.h> |
12 | #include <sys/resource.h> | |
13 | #include <pthread.h> | |
a6bc4ca9 | 14 | #include <algorithm> |
8b3bd7a3 SM |
15 | |
16 | #include "defaults.h" | |
17 | #include "macros.h" | |
1a1a34b4 MJ |
18 | #include "error.h" |
19 | ||
4d5fb75f | 20 | static int pthread_attr_init_done; |
1a1a34b4 | 21 | static pthread_attr_t tattr; |
8b3bd7a3 | 22 | |
81663f07 MJ |
23 | static size_t get_page_size(void) |
24 | { | |
25 | const long ret = sysconf(_SC_PAGE_SIZE); | |
26 | ||
27 | if (ret < 0) { | |
28 | /* | |
29 | * Fatal error since there is no safe way to recover from this. | |
30 | */ | |
31 | PERROR("Failed to get system page size using sysconf(_SC_PAGE_SIZE)"); | |
32 | abort(); | |
33 | } | |
34 | ||
35 | return (size_t) ret; | |
36 | } | |
37 | ||
78d8fb4f | 38 | size_t default_get_channel_subbuf_size(void) |
8b3bd7a3 | 39 | { |
a6bc4ca9 | 40 | return std::max<size_t>(_DEFAULT_CHANNEL_SUBBUF_SIZE, get_page_size()); |
78d8fb4f JG |
41 | } |
42 | ||
78d8fb4f JG |
43 | size_t default_get_metadata_subbuf_size(void) |
44 | { | |
a6bc4ca9 | 45 | return std::max<size_t>(DEFAULT_METADATA_SUBBUF_SIZE, get_page_size()); |
78d8fb4f JG |
46 | } |
47 | ||
78d8fb4f JG |
48 | size_t default_get_kernel_channel_subbuf_size(void) |
49 | { | |
a6bc4ca9 | 50 | return std::max<size_t>(DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE, get_page_size()); |
78d8fb4f JG |
51 | } |
52 | ||
78d8fb4f JG |
53 | size_t default_get_ust_pid_channel_subbuf_size(void) |
54 | { | |
a6bc4ca9 | 55 | return std::max<size_t>(DEFAULT_UST_PID_CHANNEL_SUBBUF_SIZE, get_page_size()); |
78d8fb4f JG |
56 | } |
57 | ||
78d8fb4f JG |
58 | size_t default_get_ust_uid_channel_subbuf_size(void) |
59 | { | |
a6bc4ca9 | 60 | return std::max<size_t>(DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE, get_page_size()); |
8b3bd7a3 | 61 | } |
1a1a34b4 | 62 | |
1a1a34b4 MJ |
63 | pthread_attr_t *default_pthread_attr(void) |
64 | { | |
4d5fb75f JG |
65 | if (pthread_attr_init_done) { |
66 | return &tattr; | |
67 | } | |
1a1a34b4 | 68 | |
b38afa27 | 69 | WARN("Uninitialized pthread attributes, using libc defaults."); |
4d5fb75f JG |
70 | return NULL; |
71 | } | |
1a1a34b4 | 72 | |
4d5fb75f JG |
73 | static void __attribute__((constructor)) init_default_pthread_attr(void) |
74 | { | |
75 | int ret; | |
76 | struct rlimit rlim; | |
77 | size_t pthread_ss, system_ss, selected_ss; | |
78 | ||
79 | ret = pthread_attr_init(&tattr); | |
80 | if (ret) { | |
81 | errno = ret; | |
82 | PERROR("pthread_attr_init"); | |
83 | goto error; | |
1a1a34b4 MJ |
84 | } |
85 | ||
86 | /* Get system stack size limits. */ | |
87 | ret = getrlimit(RLIMIT_STACK, &rlim); | |
88 | if (ret < 0) { | |
89 | PERROR("getrlimit"); | |
4d5fb75f | 90 | goto error_destroy; |
1a1a34b4 MJ |
91 | } |
92 | DBG("Stack size limits: soft %lld, hard %lld bytes", | |
93 | (long long) rlim.rlim_cur, | |
94 | (long long) rlim.rlim_max); | |
95 | ||
4d5fb75f JG |
96 | /* |
97 | * getrlimit() may return a stack size of "-1", meaning "unlimited". | |
98 | * In this case, we impose a known-good default minimum value which will | |
99 | * override the libc's default stack size if it is smaller. | |
100 | */ | |
101 | system_ss = rlim.rlim_cur != -1 ? rlim.rlim_cur : | |
102 | DEFAULT_LTTNG_THREAD_STACK_SIZE; | |
103 | ||
1a1a34b4 | 104 | /* Get pthread default thread stack size. */ |
4d5fb75f | 105 | ret = pthread_attr_getstacksize(&tattr, &pthread_ss); |
1a1a34b4 MJ |
106 | if (ret < 0) { |
107 | PERROR("pthread_attr_getstacksize"); | |
4d5fb75f | 108 | goto error_destroy; |
1a1a34b4 | 109 | } |
4d5fb75f JG |
110 | DBG("Default pthread stack size is %zu bytes", pthread_ss); |
111 | ||
a6bc4ca9 | 112 | selected_ss = std::max(pthread_ss, system_ss); |
4d5fb75f JG |
113 | if (selected_ss < DEFAULT_LTTNG_THREAD_STACK_SIZE) { |
114 | DBG("Default stack size is too small, setting it to %zu bytes", | |
115 | (size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE); | |
116 | selected_ss = DEFAULT_LTTNG_THREAD_STACK_SIZE; | |
1a1a34b4 MJ |
117 | } |
118 | ||
89e06fb5 | 119 | if (rlim.rlim_max > 0 && selected_ss > rlim.rlim_max) { |
0d43a013 | 120 | WARN("Your system's stack size restrictions (%zu bytes) may be too low for the LTTng daemons to function properly, please set the stack size limit to at least %zu bytes to ensure reliable operation", |
4d5fb75f JG |
121 | (size_t) rlim.rlim_max, (size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE); |
122 | selected_ss = (size_t) rlim.rlim_max; | |
123 | } | |
124 | ||
125 | ret = pthread_attr_setstacksize(&tattr, selected_ss); | |
126 | if (ret < 0) { | |
127 | PERROR("pthread_attr_setstacksize"); | |
128 | goto error_destroy; | |
129 | } | |
130 | pthread_attr_init_done = 1; | |
1a1a34b4 | 131 | error: |
4d5fb75f JG |
132 | return; |
133 | error_destroy: | |
134 | ret = pthread_attr_destroy(&tattr); | |
135 | if (ret) { | |
136 | errno = ret; | |
137 | PERROR("pthread_attr_destroy"); | |
138 | } | |
139 | } | |
140 | ||
141 | static void __attribute__((destructor)) fini_default_pthread_attr(void) | |
142 | { | |
143 | int ret; | |
144 | ||
145 | if (!pthread_attr_init_done) { | |
146 | return; | |
147 | } | |
148 | ||
149 | ret = pthread_attr_destroy(&tattr); | |
150 | if (ret) { | |
151 | errno = ret; | |
152 | PERROR("pthread_attr_destroy"); | |
153 | } | |
1a1a34b4 | 154 | } |