| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #include "libnetdata/libnetdata.h" |
| 4 | |
| 5 | static OS_SYSTEM_MEMORY os_system_memory_last = { |
| 6 | 0, 0, |
| 7 | }; |
| 8 | |
| 9 | OS_SYSTEM_MEMORY os_last_reported_system_memory(void) { |
| 10 | return os_system_memory_last; |
| 11 | } |
| 12 | |
| 13 | // Windows |
| 14 | #if defined(OS_WINDOWS) |
| 15 | #include <windows.h> |
| 16 | |
| 17 | OS_SYSTEM_MEMORY os_system_memory(bool query_total_ram __maybe_unused) { |
| 18 | OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 19 | |
| 20 | MEMORYSTATUSEX statex; |
| 21 | statex.dwLength = sizeof(statex); |
| 22 | if (GlobalMemoryStatusEx(&statex)) { |
| 23 | sm.ram_total_bytes = statex.ullTotalPhys; |
| 24 | sm.ram_available_bytes = statex.ullAvailPhys; |
| 25 | os_system_memory_last = sm; |
| 26 | } |
| 27 | |
| 28 | return sm; |
| 29 | } |
| 30 | #endif |
| 31 | |
| 32 | // Linux |
| 33 | #if defined(OS_LINUX) |
| 34 | |
| 35 | static OS_SYSTEM_MEMORY os_system_memory_cgroup_v1(bool query_total_ram __maybe_unused) { |
| 36 | static OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 37 | char buf[4096]; |
| 38 | uint64_t used = 0, inactive = 0; |
| 39 | |
| 40 | if(query_total_ram || sm.ram_total_bytes == 0) { |
| 41 | if (read_txt_file("/sys/fs/cgroup/memory/memory.limit_in_bytes", buf, sizeof(buf)) != 0) |
| 42 | goto failed; |
| 43 | |
| 44 | sm.ram_total_bytes = str2ull(buf, NULL); |
| 45 | if(!sm.ram_total_bytes) |
| 46 | goto failed; |
| 47 | } |
| 48 | |
| 49 | buf[0] = '\0'; |
| 50 | if (read_txt_file("/sys/fs/cgroup/memory/memory.usage_in_bytes", buf, sizeof(buf)) != 0) |
| 51 | goto failed; |
| 52 | |
| 53 | used = str2ull(buf, NULL); |
| 54 | if(!used || used > sm.ram_total_bytes) |
| 55 | goto failed; |
| 56 | |
| 57 | if (read_txt_file("/sys/fs/cgroup/memory/memory.stat", buf, sizeof(buf)) != 0) |
| 58 | goto done; |
| 59 | |
| 60 | const char *inactive_str = strstr(buf, "total_inactive_file "); |
| 61 | if(!inactive_str) |
| 62 | goto done; |
| 63 | |
| 64 | inactive_str += 20; |
| 65 | |
| 66 | inactive = str2ull(inactive_str, NULL); |
| 67 | if(!inactive || inactive > used) { |
| 68 | inactive = 0; |
| 69 | goto done; |
| 70 | } |
| 71 | |
| 72 | done: |
| 73 | sm.ram_available_bytes = sm.ram_total_bytes - (used - inactive); |
| 74 | return sm; |
| 75 | |
| 76 | failed: |
| 77 | sm = OS_SYSTEM_MEMORY_EMPTY; |
| 78 | return sm; |
| 79 | } |
| 80 | |
| 81 | static OS_SYSTEM_MEMORY os_system_memory_cgroup_v2(bool query_total_ram __maybe_unused) { |
| 82 | static OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 83 | char buf[4096]; |
| 84 | uint64_t used = 0, inactive = 0; |
| 85 | |
| 86 | if(query_total_ram || sm.ram_total_bytes == 0) { |
| 87 | if (read_txt_file("/sys/fs/cgroup/memory.max", buf, sizeof(buf)) != 0) |
| 88 | goto failed; |
| 89 | |
| 90 | if(strcmp(buf, "max") == 0) |
| 91 | sm.ram_total_bytes = UINT64_MAX; |
| 92 | else |
| 93 | sm.ram_total_bytes = str2ull(buf, NULL); |
| 94 | |
| 95 | if(!sm.ram_total_bytes) |
| 96 | goto failed; |
| 97 | } |
| 98 | |
| 99 | buf[0] = '\0'; |
| 100 | if (read_txt_file("/sys/fs/cgroup/memory.current", buf, sizeof(buf)) != 0) |
| 101 | goto failed; |
| 102 | |
| 103 | used = str2ull(buf, NULL); |
| 104 | if(!used || used > sm.ram_total_bytes) |
| 105 | goto failed; |
| 106 | |
| 107 | if (read_txt_file("/sys/fs/cgroup/memory.stat", buf, sizeof(buf)) != 0) |
| 108 | goto done; |
| 109 | |
| 110 | const char *inactive_str = strstr(buf, "inactive_file "); |
| 111 | if(!inactive_str) |
| 112 | goto done; |
| 113 | |
| 114 | inactive_str += 14; |
| 115 | |
| 116 | inactive = str2ull(inactive_str, NULL); |
| 117 | if(!inactive || inactive > used) { |
| 118 | inactive = 0; |
| 119 | goto done; |
| 120 | } |
| 121 | |
| 122 | done: |
| 123 | sm.ram_available_bytes = sm.ram_total_bytes - (used - inactive); |
| 124 | return sm; |
| 125 | |
| 126 | failed: |
| 127 | sm = OS_SYSTEM_MEMORY_EMPTY; |
| 128 | return sm; |
| 129 | } |
| 130 | |
| 131 | #define MEMINFO_MEMTOTAL "MemTotal:" |
| 132 | #define MEMINFO_MEMAVAILABLE "MemAvailable:" |
| 133 | |
| 134 | static OS_SYSTEM_MEMORY os_system_memory_meminfo(bool query_total_ram __maybe_unused) { |
| 135 | static OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 136 | |
| 137 | char buf[4096]; |
| 138 | if (read_txt_file("/proc/meminfo", buf, sizeof(buf)) != 0) |
| 139 | goto failed; |
| 140 | |
| 141 | char *s = strstr(buf, MEMINFO_MEMTOTAL); |
| 142 | if(!s) goto failed; |
| 143 | s += sizeof(MEMINFO_MEMTOTAL) - 1; |
| 144 | while(isspace((uint8_t)*s)) s++; |
| 145 | sm.ram_total_bytes = str2ull(s, NULL) * 1024; |
| 146 | |
| 147 | s = strstr(buf, MEMINFO_MEMAVAILABLE); |
| 148 | if(!s) goto failed; |
| 149 | s += sizeof(MEMINFO_MEMAVAILABLE) - 1; |
| 150 | while(isspace((uint8_t)*s)) s++; |
| 151 | sm.ram_available_bytes = str2ull(s, NULL) * 1024; |
| 152 | |
| 153 | return sm; |
| 154 | |
| 155 | failed: |
| 156 | sm.ram_total_bytes = 0; |
| 157 | sm.ram_available_bytes = 0; |
| 158 | return sm; |
| 159 | } |
| 160 | |
| 161 | typedef enum { |
| 162 | OS_MEM_SRC_UNKNOWN, |
| 163 | OS_MEM_SRC_CGROUP_V1, |
| 164 | OS_MEM_SRC_CGROUP_V2, |
| 165 | OS_MEM_SRC_MEMINFO, |
| 166 | } OS_MEM_SRC; |
| 167 | |
| 168 | OS_SYSTEM_MEMORY os_system_memory(bool query_total_ram __maybe_unused) { |
| 169 | static OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 170 | static usec_t last_ut = 0, last_total_ut = 0; |
| 171 | static OS_MEM_SRC src = OS_MEM_SRC_UNKNOWN; |
| 172 | |
| 173 | usec_t now_ut = now_monotonic_usec(); |
| 174 | if(sm.ram_total_bytes && sm.ram_available_bytes && last_ut + USEC_PER_MS > now_ut) |
| 175 | return sm; |
| 176 | |
| 177 | last_ut = now_ut; |
| 178 | |
| 179 | if(query_total_ram) |
| 180 | // let it auto-detect |
| 181 | src = OS_MEM_SRC_UNKNOWN; |
| 182 | |
| 183 | if(last_total_ut + USEC_PER_SEC > now_ut) |
| 184 | // query also the total ram |
| 185 | query_total_ram = true; |
| 186 | |
| 187 | switch(src) { |
| 188 | case OS_MEM_SRC_MEMINFO: |
| 189 | sm = os_system_memory_meminfo(query_total_ram); |
| 190 | break; |
| 191 | |
| 192 | case OS_MEM_SRC_CGROUP_V2: |
| 193 | sm = os_system_memory_cgroup_v2(query_total_ram); |
| 194 | break; |
| 195 | |
| 196 | case OS_MEM_SRC_CGROUP_V1: |
| 197 | sm = os_system_memory_cgroup_v1(query_total_ram); |
| 198 | break; |
| 199 | |
| 200 | default: |
| 201 | case OS_MEM_SRC_UNKNOWN: { |
| 202 | OS_SYSTEM_MEMORY mi = os_system_memory_meminfo(true); |
| 203 | OS_SYSTEM_MEMORY v1 = os_system_memory_cgroup_v1(true); |
| 204 | OS_SYSTEM_MEMORY v2 = os_system_memory_cgroup_v2(true); |
| 205 | |
| 206 | if(v2.ram_total_bytes && v2.ram_available_bytes && v2.ram_total_bytes <= mi.ram_total_bytes && v2.ram_available_bytes < mi.ram_available_bytes) { |
| 207 | sm = v2; |
| 208 | src = OS_MEM_SRC_CGROUP_V2; |
| 209 | } |
| 210 | else { |
| 211 | // if(v2.ram_total_bytes || v2.ram_available_bytes) |
| 212 | // nd_log(NDLS_DAEMON, NDLP_ERR, "SYSTEM_MEMORY: cgroup v2 reports more memory than meminfo. Ignoring cgroup v2."); |
| 213 | |
| 214 | if (v1.ram_total_bytes && v1.ram_available_bytes && v1.ram_total_bytes <= mi.ram_total_bytes && |
| 215 | v1.ram_available_bytes < mi.ram_available_bytes) { |
| 216 | sm = v1; |
| 217 | src = OS_MEM_SRC_CGROUP_V1; |
| 218 | } |
| 219 | else { |
| 220 | // if(v1.ram_total_bytes || v1.ram_available_bytes) |
| 221 | // nd_log(NDLS_DAEMON, NDLP_ERR, "SYSTEM_MEMORY: cgroup v1 reports more memory than meminfo. Ignoring cgroup v1."); |
| 222 | |
| 223 | sm = mi; |
| 224 | src = OS_MEM_SRC_MEMINFO; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | os_system_memory_last = sm; |
| 231 | return sm; |
| 232 | } |
| 233 | #endif |
| 234 | |
| 235 | // FreeBSD |
| 236 | #if defined(OS_FREEBSD) |
| 237 | #include <sys/types.h> |
| 238 | #include <sys/sysctl.h> |
| 239 | |
| 240 | OS_SYSTEM_MEMORY os_system_memory(bool query_total_ram) { |
| 241 | static OS_SYSTEM_MEMORY sm = OS_SYSTEM_MEMORY_EMPTY; |
| 242 | |
| 243 | // Query the total RAM only if needed or if it hasn't been cached |
| 244 | if (query_total_ram || sm.ram_total_bytes == 0) { |
| 245 | uint64_t total_pages = 0; |
| 246 | size_t size = sizeof(total_pages); |
| 247 | if (sysctlbyname("vm.stats.vm.v_page_count", &total_pages, &size, NULL, 0) != 0) |
| 248 | goto failed; |
| 249 | |
| 250 | unsigned long page_size = 0; |
| 251 | size = sizeof(page_size); |
| 252 | if (sysctlbyname("hw.pagesize", &page_size, &size, NULL, 0) != 0) |
| 253 | goto failed; |
| 254 | |
| 255 | sm.ram_total_bytes = total_pages * page_size; |
| 256 | } |
| 257 | |
| 258 | // Query the available RAM (free + inactive pages) |
| 259 | uint64_t free_pages = 0, inactive_pages = 0; |
| 260 | size_t size = sizeof(free_pages); |
| 261 | if (sysctlbyname("vm.stats.vm.v_free_count", &free_pages, &size, NULL, 0) != 0 || |
| 262 | sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_pages, &size, NULL, 0) != 0) |
| 263 | goto failed; |
| 264 | |
| 265 | unsigned long page_size = 0; |
| 266 | size = sizeof(page_size); |
| 267 | if (sysctlbyname("hw.pagesize", &page_size, &size, NULL, 0) != 0) |
| 268 | goto failed; |
| 269 | |
| 270 | sm.ram_available_bytes = (free_pages + inactive_pages) * page_size; |
| 271 | |
| 272 | os_system_memory_last = sm; |
| 273 | return sm; |
| 274 | |
| 275 | failed: |
| 276 | sm = OS_SYSTEM_MEMORY_EMPTY; |
| 277 | return sm; |
| 278 | } |
| 279 | #endif |
| 280 | |
| 281 | // macOS |
| 282 | #if defined(OS_MACOS) |
| 283 | #include <mach/mach.h> |
| 284 | #include <sys/sysctl.h> |
| 285 | |
| 286 | OS_SYSTEM_MEMORY os_system_memory(bool query_total_ram) { |
| 287 | static uint64_t total_ram = 0; |
| 288 | static uint64_t page_size = 0; |
| 289 | |
| 290 | if (page_size == 0) { |
| 291 | size_t len = sizeof(page_size); |
| 292 | if (sysctlbyname("hw.pagesize", &page_size, &len, NULL, 0) != 0) |
| 293 | return OS_SYSTEM_MEMORY_EMPTY; |
| 294 | } |
| 295 | |
| 296 | if (query_total_ram || total_ram == 0) { |
| 297 | size_t len = sizeof(total_ram); |
| 298 | if (sysctlbyname("hw.memsize", &total_ram, &len, NULL, 0) != 0) |
| 299 | return OS_SYSTEM_MEMORY_EMPTY; |
| 300 | } |
| 301 | |
| 302 | uint64_t ram_available = 0; |
| 303 | if (page_size > 0) { |
| 304 | vm_statistics64_data_t vm_info; |
| 305 | mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
| 306 | mach_port_t mach_port = mach_host_self(); |
| 307 | |
| 308 | if (host_statistics64(mach_port, HOST_VM_INFO64, (host_info_t)&vm_info, &count) != KERN_SUCCESS) { |
| 309 | mach_port_deallocate(mach_task_self(), mach_port); |
| 310 | return OS_SYSTEM_MEMORY_EMPTY; |
| 311 | } |
| 312 | |
| 313 | ram_available = (vm_info.free_count + vm_info.inactive_count + vm_info.purgeable_count) * page_size; |
| 314 | mach_port_deallocate(mach_task_self(), mach_port); |
| 315 | } |
| 316 | |
| 317 | os_system_memory_last = (OS_SYSTEM_MEMORY){ |
| 318 | .ram_total_bytes = total_ram, |
| 319 | .ram_available_bytes = ram_available, |
| 320 | }; |
| 321 | return os_system_memory_last; |
| 322 | } |
| 323 | #endif |
| 324 | |
| 325 | double os_system_memory_available_percent(OS_SYSTEM_MEMORY mem) { |
| 326 | if (!OS_SYSTEM_MEMORY_OK(mem)) |
| 327 | return 100.0; |
| 328 | |
| 329 | return 100.0 * (double)mem.ram_available_bytes / (double)mem.ram_total_bytes; |
| 330 | } |