Commit | Line | Data |
---|---|---|
8b3bd7a3 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2012 Simon Marchi <simon.marchi@polymtl.ca> |
8b3bd7a3 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-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> | |
8b3bd7a3 SM |
14 | |
15 | #include "defaults.h" | |
16 | #include "macros.h" | |
78d8fb4f | 17 | #include "align.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 | |
78d8fb4f | 23 | size_t default_get_channel_subbuf_size(void) |
8b3bd7a3 | 24 | { |
78d8fb4f JG |
25 | return max(_DEFAULT_CHANNEL_SUBBUF_SIZE, PAGE_SIZE); |
26 | } | |
27 | ||
78d8fb4f JG |
28 | size_t default_get_metadata_subbuf_size(void) |
29 | { | |
30 | return max(DEFAULT_METADATA_SUBBUF_SIZE, PAGE_SIZE); | |
31 | } | |
32 | ||
78d8fb4f JG |
33 | size_t default_get_kernel_channel_subbuf_size(void) |
34 | { | |
35 | return max(DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE, PAGE_SIZE); | |
36 | } | |
37 | ||
78d8fb4f JG |
38 | size_t default_get_ust_pid_channel_subbuf_size(void) |
39 | { | |
40 | return max(DEFAULT_UST_PID_CHANNEL_SUBBUF_SIZE, PAGE_SIZE); | |
41 | } | |
42 | ||
78d8fb4f JG |
43 | size_t default_get_ust_uid_channel_subbuf_size(void) |
44 | { | |
45 | return max(DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE, PAGE_SIZE); | |
8b3bd7a3 | 46 | } |
1a1a34b4 | 47 | |
1a1a34b4 MJ |
48 | pthread_attr_t *default_pthread_attr(void) |
49 | { | |
4d5fb75f JG |
50 | if (pthread_attr_init_done) { |
51 | return &tattr; | |
52 | } | |
1a1a34b4 | 53 | |
b38afa27 | 54 | WARN("Uninitialized pthread attributes, using libc defaults."); |
4d5fb75f JG |
55 | return NULL; |
56 | } | |
1a1a34b4 | 57 | |
4d5fb75f JG |
58 | static void __attribute__((constructor)) init_default_pthread_attr(void) |
59 | { | |
60 | int ret; | |
61 | struct rlimit rlim; | |
62 | size_t pthread_ss, system_ss, selected_ss; | |
63 | ||
64 | ret = pthread_attr_init(&tattr); | |
65 | if (ret) { | |
66 | errno = ret; | |
67 | PERROR("pthread_attr_init"); | |
68 | goto error; | |
1a1a34b4 MJ |
69 | } |
70 | ||
71 | /* Get system stack size limits. */ | |
72 | ret = getrlimit(RLIMIT_STACK, &rlim); | |
73 | if (ret < 0) { | |
74 | PERROR("getrlimit"); | |
4d5fb75f | 75 | goto error_destroy; |
1a1a34b4 MJ |
76 | } |
77 | DBG("Stack size limits: soft %lld, hard %lld bytes", | |
78 | (long long) rlim.rlim_cur, | |
79 | (long long) rlim.rlim_max); | |
80 | ||
4d5fb75f JG |
81 | /* |
82 | * getrlimit() may return a stack size of "-1", meaning "unlimited". | |
83 | * In this case, we impose a known-good default minimum value which will | |
84 | * override the libc's default stack size if it is smaller. | |
85 | */ | |
86 | system_ss = rlim.rlim_cur != -1 ? rlim.rlim_cur : | |
87 | DEFAULT_LTTNG_THREAD_STACK_SIZE; | |
88 | ||
1a1a34b4 | 89 | /* Get pthread default thread stack size. */ |
4d5fb75f | 90 | ret = pthread_attr_getstacksize(&tattr, &pthread_ss); |
1a1a34b4 MJ |
91 | if (ret < 0) { |
92 | PERROR("pthread_attr_getstacksize"); | |
4d5fb75f | 93 | goto error_destroy; |
1a1a34b4 | 94 | } |
4d5fb75f JG |
95 | DBG("Default pthread stack size is %zu bytes", pthread_ss); |
96 | ||
97 | selected_ss = max_t(size_t, pthread_ss, system_ss); | |
98 | if (selected_ss < DEFAULT_LTTNG_THREAD_STACK_SIZE) { | |
99 | DBG("Default stack size is too small, setting it to %zu bytes", | |
100 | (size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE); | |
101 | selected_ss = DEFAULT_LTTNG_THREAD_STACK_SIZE; | |
1a1a34b4 MJ |
102 | } |
103 | ||
89e06fb5 | 104 | if (rlim.rlim_max > 0 && selected_ss > rlim.rlim_max) { |
0d43a013 | 105 | 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 |
106 | (size_t) rlim.rlim_max, (size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE); |
107 | selected_ss = (size_t) rlim.rlim_max; | |
108 | } | |
109 | ||
110 | ret = pthread_attr_setstacksize(&tattr, selected_ss); | |
111 | if (ret < 0) { | |
112 | PERROR("pthread_attr_setstacksize"); | |
113 | goto error_destroy; | |
114 | } | |
115 | pthread_attr_init_done = 1; | |
1a1a34b4 | 116 | error: |
4d5fb75f JG |
117 | return; |
118 | error_destroy: | |
119 | ret = pthread_attr_destroy(&tattr); | |
120 | if (ret) { | |
121 | errno = ret; | |
122 | PERROR("pthread_attr_destroy"); | |
123 | } | |
124 | } | |
125 | ||
126 | static void __attribute__((destructor)) fini_default_pthread_attr(void) | |
127 | { | |
128 | int ret; | |
129 | ||
130 | if (!pthread_attr_init_done) { | |
131 | return; | |
132 | } | |
133 | ||
134 | ret = pthread_attr_destroy(&tattr); | |
135 | if (ret) { | |
136 | errno = ret; | |
137 | PERROR("pthread_attr_destroy"); | |
138 | } | |
1a1a34b4 | 139 | } |