Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "lowmemorykiller" |
| 18 | |
| 19 | #include <errno.h> |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 20 | #include <inttypes.h> |
Mark Salyzyn | cfd5b08 | 2016-10-17 14:28:00 -0700 | [diff] [blame] | 21 | #include <sched.h> |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 22 | #include <signal.h> |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
Mark Salyzyn | e6ed68b | 2014-04-30 13:36:35 -0700 | [diff] [blame] | 25 | #include <sys/cdefs.h> |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 26 | #include <sys/epoll.h> |
| 27 | #include <sys/eventfd.h> |
Colin Cross | b28ff91 | 2014-07-11 17:15:44 -0700 | [diff] [blame] | 28 | #include <sys/mman.h> |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 29 | #include <sys/socket.h> |
| 30 | #include <sys/types.h> |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 31 | #include <sys/sysinfo.h> |
Mark Salyzyn | e6ed68b | 2014-04-30 13:36:35 -0700 | [diff] [blame] | 32 | #include <unistd.h> |
| 33 | |
Robert Benea | 58891d5 | 2017-07-31 17:15:20 -0700 | [diff] [blame] | 34 | #include <cutils/properties.h> |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 35 | #include <cutils/sockets.h> |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 36 | #include <lmkd.h> |
Mark Salyzyn | 30f991f | 2017-01-10 13:19:54 -0800 | [diff] [blame] | 37 | #include <log/log.h> |
Mark Salyzyn | e6ed68b | 2014-04-30 13:36:35 -0700 | [diff] [blame] | 38 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 39 | #ifdef LMKD_LOG_STATS |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 40 | #include <statslog.h> |
| 41 | #endif |
| 42 | |
Suren Baghdasaryan | c713559 | 2018-01-04 10:43:58 -0800 | [diff] [blame] | 43 | /* |
| 44 | * Define LMKD_TRACE_KILLS to record lmkd kills in kernel traces |
| 45 | * to profile and correlate with OOM kills |
| 46 | */ |
| 47 | #ifdef LMKD_TRACE_KILLS |
| 48 | |
| 49 | #define ATRACE_TAG ATRACE_TAG_ALWAYS |
| 50 | #include <cutils/trace.h> |
| 51 | |
| 52 | #define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid); |
| 53 | #define TRACE_KILL_END() ATRACE_INT(__FUNCTION__, 0); |
| 54 | |
| 55 | #else /* LMKD_TRACE_KILLS */ |
| 56 | |
Daniel Colascione | 347f6b4 | 2018-02-12 11:24:47 -0800 | [diff] [blame] | 57 | #define TRACE_KILL_START(pid) ((void)(pid)) |
| 58 | #define TRACE_KILL_END() ((void)0) |
Suren Baghdasaryan | c713559 | 2018-01-04 10:43:58 -0800 | [diff] [blame] | 59 | |
| 60 | #endif /* LMKD_TRACE_KILLS */ |
| 61 | |
Mark Salyzyn | e6ed68b | 2014-04-30 13:36:35 -0700 | [diff] [blame] | 62 | #ifndef __unused |
| 63 | #define __unused __attribute__((__unused__)) |
| 64 | #endif |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 65 | |
| 66 | #define MEMCG_SYSFS_PATH "/dev/memcg/" |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 67 | #define MEMCG_MEMORY_USAGE "/dev/memcg/memory.usage_in_bytes" |
| 68 | #define MEMCG_MEMORYSW_USAGE "/dev/memcg/memory.memsw.usage_in_bytes" |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 69 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 70 | #define LINE_MAX 128 |
| 71 | |
| 72 | #define INKERNEL_MINFREE_PATH "/sys/module/lowmemorykiller/parameters/minfree" |
| 73 | #define INKERNEL_ADJ_PATH "/sys/module/lowmemorykiller/parameters/adj" |
| 74 | |
| 75 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 76 | #define EIGHT_MEGA (1 << 23) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 77 | |
Greg Kaiser | d6d8471 | 2018-03-23 14:16:12 -0700 | [diff] [blame] | 78 | #define STRINGIFY(x) STRINGIFY_INTERNAL(x) |
| 79 | #define STRINGIFY_INTERNAL(x) #x |
| 80 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 81 | /* default to old in-kernel interface if no memory pressure events */ |
| 82 | static int use_inkernel_interface = 1; |
Robert Benea | 164baeb | 2017-09-11 16:53:28 -0700 | [diff] [blame] | 83 | static bool has_inkernel_module; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 84 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 85 | /* memory pressure levels */ |
| 86 | enum vmpressure_level { |
| 87 | VMPRESS_LEVEL_LOW = 0, |
| 88 | VMPRESS_LEVEL_MEDIUM, |
| 89 | VMPRESS_LEVEL_CRITICAL, |
| 90 | VMPRESS_LEVEL_COUNT |
| 91 | }; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 92 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 93 | static const char *level_name[] = { |
| 94 | "low", |
| 95 | "medium", |
| 96 | "critical" |
| 97 | }; |
| 98 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 99 | struct mem_size { |
| 100 | int free_mem; |
| 101 | int free_swap; |
| 102 | }; |
| 103 | |
| 104 | struct { |
| 105 | int min_free; /* recorded but not used yet */ |
| 106 | int max_free; |
| 107 | } low_pressure_mem = { -1, -1 }; |
| 108 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 109 | static int level_oomadj[VMPRESS_LEVEL_COUNT]; |
Suren Baghdasaryan | e82e15c | 2018-01-04 09:16:21 -0800 | [diff] [blame] | 110 | static int mpevfd[VMPRESS_LEVEL_COUNT] = { -1, -1, -1 }; |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 111 | static bool debug_process_killing; |
| 112 | static bool enable_pressure_upgrade; |
| 113 | static int64_t upgrade_pressure; |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 114 | static int64_t downgrade_pressure; |
Suren Baghdasaryan | 39a22e7 | 2018-04-13 11:45:38 -0700 | [diff] [blame] | 115 | static bool low_ram_device; |
Suren Baghdasaryan | 662492a | 2017-12-08 13:17:06 -0800 | [diff] [blame] | 116 | static bool kill_heaviest_task; |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 117 | static unsigned long kill_timeout_ms; |
Robert Benea | 58891d5 | 2017-07-31 17:15:20 -0700 | [diff] [blame] | 118 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 119 | /* data required to handle events */ |
| 120 | struct event_handler_info { |
| 121 | int data; |
| 122 | void (*handler)(int data, uint32_t events); |
| 123 | }; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 124 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 125 | /* data required to handle socket events */ |
| 126 | struct sock_event_handler_info { |
| 127 | int sock; |
| 128 | struct event_handler_info handler_info; |
| 129 | }; |
| 130 | |
| 131 | /* max supported number of data connections */ |
| 132 | #define MAX_DATA_CONN 2 |
| 133 | |
| 134 | /* socket event handler data */ |
| 135 | static struct sock_event_handler_info ctrl_sock; |
| 136 | static struct sock_event_handler_info data_sock[MAX_DATA_CONN]; |
| 137 | |
| 138 | /* vmpressure event handler data */ |
| 139 | static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT]; |
| 140 | |
| 141 | /* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */ |
| 142 | #define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 143 | static int epollfd; |
| 144 | static int maxevents; |
| 145 | |
Chong Zhang | 0a4acdf | 2015-10-14 16:19:53 -0700 | [diff] [blame] | 146 | /* OOM score values used by both kernel and framework */ |
Todd Poynor | 16b6099 | 2013-09-16 19:26:47 -0700 | [diff] [blame] | 147 | #define OOM_SCORE_ADJ_MIN (-1000) |
| 148 | #define OOM_SCORE_ADJ_MAX 1000 |
| 149 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 150 | static int lowmem_adj[MAX_TARGETS]; |
| 151 | static int lowmem_minfree[MAX_TARGETS]; |
| 152 | static int lowmem_targets_size; |
| 153 | |
| 154 | struct sysmeminfo { |
| 155 | int nr_free_pages; |
| 156 | int nr_file_pages; |
| 157 | int nr_shmem; |
| 158 | int totalreserve_pages; |
| 159 | }; |
| 160 | |
| 161 | struct adjslot_list { |
| 162 | struct adjslot_list *next; |
| 163 | struct adjslot_list *prev; |
| 164 | }; |
| 165 | |
| 166 | struct proc { |
| 167 | struct adjslot_list asl; |
| 168 | int pid; |
Colin Cross | fbb78c6 | 2014-06-13 14:52:43 -0700 | [diff] [blame] | 169 | uid_t uid; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 170 | int oomadj; |
| 171 | struct proc *pidhash_next; |
| 172 | }; |
| 173 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 174 | #ifdef LMKD_LOG_STATS |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 175 | static bool enable_stats_log; |
| 176 | static android_log_context log_ctx; |
| 177 | #endif |
| 178 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 179 | #define PIDHASH_SZ 1024 |
| 180 | static struct proc *pidhash[PIDHASH_SZ]; |
| 181 | #define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1)) |
| 182 | |
Chih-Hung Hsieh | daa13ea | 2016-05-19 16:02:22 -0700 | [diff] [blame] | 183 | #define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN) |
Chong Zhang | 0a4acdf | 2015-10-14 16:19:53 -0700 | [diff] [blame] | 184 | static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1]; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 185 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 186 | /* PAGE_SIZE / 1024 */ |
| 187 | static long page_k; |
| 188 | |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 189 | static ssize_t read_all(int fd, char *buf, size_t max_len) |
| 190 | { |
| 191 | ssize_t ret = 0; |
| 192 | |
| 193 | while (max_len > 0) { |
| 194 | ssize_t r = read(fd, buf, max_len); |
| 195 | if (r == 0) { |
| 196 | break; |
| 197 | } |
| 198 | if (r == -1) { |
| 199 | return -1; |
| 200 | } |
| 201 | ret += r; |
| 202 | buf += r; |
| 203 | max_len -= r; |
| 204 | } |
| 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 209 | static struct proc *pid_lookup(int pid) { |
| 210 | struct proc *procp; |
| 211 | |
| 212 | for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid; |
| 213 | procp = procp->pidhash_next) |
| 214 | ; |
| 215 | |
| 216 | return procp; |
| 217 | } |
| 218 | |
| 219 | static void adjslot_insert(struct adjslot_list *head, struct adjslot_list *new) |
| 220 | { |
| 221 | struct adjslot_list *next = head->next; |
| 222 | new->prev = head; |
| 223 | new->next = next; |
| 224 | next->prev = new; |
| 225 | head->next = new; |
| 226 | } |
| 227 | |
| 228 | static void adjslot_remove(struct adjslot_list *old) |
| 229 | { |
| 230 | struct adjslot_list *prev = old->prev; |
| 231 | struct adjslot_list *next = old->next; |
| 232 | next->prev = prev; |
| 233 | prev->next = next; |
| 234 | } |
| 235 | |
| 236 | static struct adjslot_list *adjslot_tail(struct adjslot_list *head) { |
| 237 | struct adjslot_list *asl = head->prev; |
| 238 | |
| 239 | return asl == head ? NULL : asl; |
| 240 | } |
| 241 | |
| 242 | static void proc_slot(struct proc *procp) { |
| 243 | int adjslot = ADJTOSLOT(procp->oomadj); |
| 244 | |
| 245 | adjslot_insert(&procadjslot_list[adjslot], &procp->asl); |
| 246 | } |
| 247 | |
| 248 | static void proc_unslot(struct proc *procp) { |
| 249 | adjslot_remove(&procp->asl); |
| 250 | } |
| 251 | |
| 252 | static void proc_insert(struct proc *procp) { |
| 253 | int hval = pid_hashfn(procp->pid); |
| 254 | |
| 255 | procp->pidhash_next = pidhash[hval]; |
| 256 | pidhash[hval] = procp; |
| 257 | proc_slot(procp); |
| 258 | } |
| 259 | |
| 260 | static int pid_remove(int pid) { |
| 261 | int hval = pid_hashfn(pid); |
| 262 | struct proc *procp; |
| 263 | struct proc *prevp; |
| 264 | |
| 265 | for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid; |
| 266 | procp = procp->pidhash_next) |
| 267 | prevp = procp; |
| 268 | |
| 269 | if (!procp) |
| 270 | return -1; |
| 271 | |
| 272 | if (!prevp) |
| 273 | pidhash[hval] = procp->pidhash_next; |
| 274 | else |
| 275 | prevp->pidhash_next = procp->pidhash_next; |
| 276 | |
| 277 | proc_unslot(procp); |
| 278 | free(procp); |
| 279 | return 0; |
| 280 | } |
| 281 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 282 | static void writefilestring(const char *path, char *s) { |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 283 | int fd = open(path, O_WRONLY | O_CLOEXEC); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 284 | int len = strlen(s); |
| 285 | int ret; |
| 286 | |
| 287 | if (fd < 0) { |
| 288 | ALOGE("Error opening %s; errno=%d", path, errno); |
| 289 | return; |
| 290 | } |
| 291 | |
| 292 | ret = write(fd, s, len); |
| 293 | if (ret < 0) { |
| 294 | ALOGE("Error writing %s; errno=%d", path, errno); |
| 295 | } else if (ret < len) { |
| 296 | ALOGE("Short write on %s; length=%d", path, ret); |
| 297 | } |
| 298 | |
| 299 | close(fd); |
| 300 | } |
| 301 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 302 | static void cmd_procprio(LMKD_CTRL_PACKET packet) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 303 | struct proc *procp; |
| 304 | char path[80]; |
| 305 | char val[20]; |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 306 | int soft_limit_mult; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 307 | struct lmk_procprio params; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 308 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 309 | lmkd_pack_get_procprio(packet, ¶ms); |
| 310 | |
| 311 | if (params.oomadj < OOM_SCORE_ADJ_MIN || |
| 312 | params.oomadj > OOM_SCORE_ADJ_MAX) { |
| 313 | ALOGE("Invalid PROCPRIO oomadj argument %d", params.oomadj); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 314 | return; |
| 315 | } |
| 316 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 317 | snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", params.pid); |
| 318 | snprintf(val, sizeof(val), "%d", params.oomadj); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 319 | writefilestring(path, val); |
| 320 | |
| 321 | if (use_inkernel_interface) |
| 322 | return; |
| 323 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 324 | if (params.oomadj >= 900) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 325 | soft_limit_mult = 0; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 326 | } else if (params.oomadj >= 800) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 327 | soft_limit_mult = 0; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 328 | } else if (params.oomadj >= 700) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 329 | soft_limit_mult = 0; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 330 | } else if (params.oomadj >= 600) { |
Robert Benea | caeaa65 | 2017-08-11 16:03:20 -0700 | [diff] [blame] | 331 | // Launcher should be perceptible, don't kill it. |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 332 | params.oomadj = 200; |
Robert Benea | caeaa65 | 2017-08-11 16:03:20 -0700 | [diff] [blame] | 333 | soft_limit_mult = 1; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 334 | } else if (params.oomadj >= 500) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 335 | soft_limit_mult = 0; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 336 | } else if (params.oomadj >= 400) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 337 | soft_limit_mult = 0; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 338 | } else if (params.oomadj >= 300) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 339 | soft_limit_mult = 1; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 340 | } else if (params.oomadj >= 200) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 341 | soft_limit_mult = 2; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 342 | } else if (params.oomadj >= 100) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 343 | soft_limit_mult = 10; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 344 | } else if (params.oomadj >= 0) { |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 345 | soft_limit_mult = 20; |
| 346 | } else { |
| 347 | // Persistent processes will have a large |
| 348 | // soft limit 512MB. |
| 349 | soft_limit_mult = 64; |
| 350 | } |
| 351 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 352 | snprintf(path, sizeof(path), |
| 353 | "/dev/memcg/apps/uid_%d/pid_%d/memory.soft_limit_in_bytes", |
| 354 | params.uid, params.pid); |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 355 | snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA); |
| 356 | writefilestring(path, val); |
| 357 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 358 | procp = pid_lookup(params.pid); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 359 | if (!procp) { |
| 360 | procp = malloc(sizeof(struct proc)); |
| 361 | if (!procp) { |
| 362 | // Oh, the irony. May need to rebuild our state. |
| 363 | return; |
| 364 | } |
| 365 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 366 | procp->pid = params.pid; |
| 367 | procp->uid = params.uid; |
| 368 | procp->oomadj = params.oomadj; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 369 | proc_insert(procp); |
| 370 | } else { |
| 371 | proc_unslot(procp); |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 372 | procp->oomadj = params.oomadj; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 373 | proc_slot(procp); |
| 374 | } |
| 375 | } |
| 376 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 377 | static void cmd_procremove(LMKD_CTRL_PACKET packet) { |
| 378 | struct lmk_procremove params; |
| 379 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 380 | if (use_inkernel_interface) |
| 381 | return; |
| 382 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 383 | lmkd_pack_get_procremove(packet, ¶ms); |
| 384 | pid_remove(params.pid); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 387 | static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 388 | int i; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 389 | struct lmk_target target; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 390 | |
| 391 | if (ntargets > (int)ARRAY_SIZE(lowmem_adj)) |
| 392 | return; |
| 393 | |
| 394 | for (i = 0; i < ntargets; i++) { |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 395 | lmkd_pack_get_target(packet, i, &target); |
| 396 | lowmem_minfree[i] = target.minfree; |
| 397 | lowmem_adj[i] = target.oom_adj_score; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | lowmem_targets_size = ntargets; |
| 401 | |
Robert Benea | 164baeb | 2017-09-11 16:53:28 -0700 | [diff] [blame] | 402 | if (has_inkernel_module) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 403 | char minfreestr[128]; |
| 404 | char killpriostr[128]; |
| 405 | |
| 406 | minfreestr[0] = '\0'; |
| 407 | killpriostr[0] = '\0'; |
| 408 | |
| 409 | for (i = 0; i < lowmem_targets_size; i++) { |
| 410 | char val[40]; |
| 411 | |
| 412 | if (i) { |
| 413 | strlcat(minfreestr, ",", sizeof(minfreestr)); |
| 414 | strlcat(killpriostr, ",", sizeof(killpriostr)); |
| 415 | } |
| 416 | |
Robert Benea | 164baeb | 2017-09-11 16:53:28 -0700 | [diff] [blame] | 417 | snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 418 | strlcat(minfreestr, val, sizeof(minfreestr)); |
Robert Benea | 164baeb | 2017-09-11 16:53:28 -0700 | [diff] [blame] | 419 | snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 420 | strlcat(killpriostr, val, sizeof(killpriostr)); |
| 421 | } |
| 422 | |
| 423 | writefilestring(INKERNEL_MINFREE_PATH, minfreestr); |
| 424 | writefilestring(INKERNEL_ADJ_PATH, killpriostr); |
| 425 | } |
| 426 | } |
| 427 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 428 | static void ctrl_data_close(int dsock_idx) { |
| 429 | struct epoll_event epev; |
| 430 | |
| 431 | ALOGI("closing lmkd data connection"); |
| 432 | if (epoll_ctl(epollfd, EPOLL_CTL_DEL, data_sock[dsock_idx].sock, &epev) == -1) { |
| 433 | // Log a warning and keep going |
| 434 | ALOGW("epoll_ctl for data connection socket failed; errno=%d", errno); |
| 435 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 436 | maxevents--; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 437 | |
| 438 | close(data_sock[dsock_idx].sock); |
| 439 | data_sock[dsock_idx].sock = -1; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 442 | static int ctrl_data_read(int dsock_idx, char *buf, size_t bufsz) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 443 | int ret = 0; |
| 444 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 445 | ret = read(data_sock[dsock_idx].sock, buf, bufsz); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 446 | |
| 447 | if (ret == -1) { |
| 448 | ALOGE("control data socket read failed; errno=%d", errno); |
| 449 | } else if (ret == 0) { |
| 450 | ALOGE("Got EOF on control data socket"); |
| 451 | ret = -1; |
| 452 | } |
| 453 | |
| 454 | return ret; |
| 455 | } |
| 456 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 457 | static void ctrl_command_handler(int dsock_idx) { |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 458 | LMKD_CTRL_PACKET packet; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 459 | int len; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 460 | enum lmk_cmd cmd; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 461 | int nargs; |
| 462 | int targets; |
| 463 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 464 | len = ctrl_data_read(dsock_idx, (char *)packet, CTRL_PACKET_MAX_SIZE); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 465 | if (len <= 0) |
| 466 | return; |
| 467 | |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 468 | if (len < (int)sizeof(int)) { |
| 469 | ALOGE("Wrong control socket read length len=%d", len); |
| 470 | return; |
| 471 | } |
| 472 | |
| 473 | cmd = lmkd_pack_get_cmd(packet); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 474 | nargs = len / sizeof(int) - 1; |
| 475 | if (nargs < 0) |
| 476 | goto wronglen; |
| 477 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 478 | switch(cmd) { |
| 479 | case LMK_TARGET: |
| 480 | targets = nargs / 2; |
| 481 | if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj)) |
| 482 | goto wronglen; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 483 | cmd_target(targets, packet); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 484 | break; |
| 485 | case LMK_PROCPRIO: |
Colin Cross | fbb78c6 | 2014-06-13 14:52:43 -0700 | [diff] [blame] | 486 | if (nargs != 3) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 487 | goto wronglen; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 488 | cmd_procprio(packet); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 489 | break; |
| 490 | case LMK_PROCREMOVE: |
| 491 | if (nargs != 1) |
| 492 | goto wronglen; |
Suren Baghdasaryan | 0f10051 | 2018-01-24 16:51:41 -0800 | [diff] [blame] | 493 | cmd_procremove(packet); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 494 | break; |
| 495 | default: |
| 496 | ALOGE("Received unknown command code %d", cmd); |
| 497 | return; |
| 498 | } |
| 499 | |
| 500 | return; |
| 501 | |
| 502 | wronglen: |
| 503 | ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len); |
| 504 | } |
| 505 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 506 | static void ctrl_data_handler(int data, uint32_t events) { |
| 507 | if (events & EPOLLIN) { |
| 508 | ctrl_command_handler(data); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 509 | } |
| 510 | } |
| 511 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 512 | static int get_free_dsock() { |
| 513 | for (int i = 0; i < MAX_DATA_CONN; i++) { |
| 514 | if (data_sock[i].sock < 0) { |
| 515 | return i; |
| 516 | } |
| 517 | } |
| 518 | return -1; |
| 519 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 520 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 521 | static void ctrl_connect_handler(int data __unused, uint32_t events __unused) { |
| 522 | struct epoll_event epev; |
| 523 | int free_dscock_idx = get_free_dsock(); |
| 524 | |
| 525 | if (free_dscock_idx < 0) { |
| 526 | /* |
| 527 | * Number of data connections exceeded max supported. This should not |
| 528 | * happen but if it does we drop all existing connections and accept |
| 529 | * the new one. This prevents inactive connections from monopolizing |
| 530 | * data socket and if we drop ActivityManager connection it will |
| 531 | * immediately reconnect. |
| 532 | */ |
| 533 | for (int i = 0; i < MAX_DATA_CONN; i++) { |
| 534 | ctrl_data_close(i); |
| 535 | } |
| 536 | free_dscock_idx = 0; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 537 | } |
| 538 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 539 | data_sock[free_dscock_idx].sock = accept(ctrl_sock.sock, NULL, NULL); |
| 540 | if (data_sock[free_dscock_idx].sock < 0) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 541 | ALOGE("lmkd control socket accept failed; errno=%d", errno); |
| 542 | return; |
| 543 | } |
| 544 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 545 | ALOGI("lmkd data connection established"); |
| 546 | /* use data to store data connection idx */ |
| 547 | data_sock[free_dscock_idx].handler_info.data = free_dscock_idx; |
| 548 | data_sock[free_dscock_idx].handler_info.handler = ctrl_data_handler; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 549 | epev.events = EPOLLIN; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 550 | epev.data.ptr = (void *)&(data_sock[free_dscock_idx].handler_info); |
| 551 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, data_sock[free_dscock_idx].sock, &epev) == -1) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 552 | ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno); |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 553 | ctrl_data_close(free_dscock_idx); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 554 | return; |
| 555 | } |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 556 | maxevents++; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 559 | #ifdef LMKD_LOG_STATS |
| 560 | static void memory_stat_parse_line(char *line, struct memory_stat *mem_st) { |
Greg Kaiser | d6d8471 | 2018-03-23 14:16:12 -0700 | [diff] [blame] | 561 | char key[LINE_MAX + 1]; |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 562 | int64_t value; |
| 563 | |
Greg Kaiser | d6d8471 | 2018-03-23 14:16:12 -0700 | [diff] [blame] | 564 | sscanf(line, "%" STRINGIFY(LINE_MAX) "s %" SCNd64 "", key, &value); |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 565 | |
| 566 | if (strcmp(key, "total_") < 0) { |
| 567 | return; |
| 568 | } |
| 569 | |
| 570 | if (!strcmp(key, "total_pgfault")) |
| 571 | mem_st->pgfault = value; |
| 572 | else if (!strcmp(key, "total_pgmajfault")) |
| 573 | mem_st->pgmajfault = value; |
| 574 | else if (!strcmp(key, "total_rss")) |
| 575 | mem_st->rss_in_bytes = value; |
| 576 | else if (!strcmp(key, "total_cache")) |
| 577 | mem_st->cache_in_bytes = value; |
| 578 | else if (!strcmp(key, "total_swap")) |
| 579 | mem_st->swap_in_bytes = value; |
| 580 | } |
| 581 | |
| 582 | static int memory_stat_parse(struct memory_stat *mem_st, int pid, uid_t uid) { |
| 583 | FILE *fp; |
| 584 | char buf[PATH_MAX]; |
| 585 | |
| 586 | snprintf(buf, sizeof(buf), MEMCG_PROCESS_MEMORY_STAT_PATH, uid, pid); |
| 587 | |
| 588 | fp = fopen(buf, "r"); |
| 589 | |
| 590 | if (fp == NULL) { |
Rajeev Kumar | 92b659b | 2018-02-21 19:08:15 -0800 | [diff] [blame] | 591 | ALOGE("%s open failed: %s", buf, strerror(errno)); |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 592 | return -1; |
| 593 | } |
| 594 | |
| 595 | while (fgets(buf, PAGE_SIZE, fp) != NULL ) { |
| 596 | memory_stat_parse_line(buf, mem_st); |
| 597 | } |
| 598 | fclose(fp); |
| 599 | |
| 600 | return 0; |
| 601 | } |
| 602 | #endif |
| 603 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 604 | static int get_free_memory(struct mem_size *ms) { |
| 605 | struct sysinfo si; |
| 606 | |
| 607 | if (sysinfo(&si) < 0) |
| 608 | return -1; |
| 609 | |
| 610 | ms->free_mem = (int)(si.freeram * si.mem_unit / PAGE_SIZE); |
| 611 | ms->free_swap = (int)(si.freeswap * si.mem_unit / PAGE_SIZE); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 616 | static int proc_get_size(int pid) { |
| 617 | char path[PATH_MAX]; |
| 618 | char line[LINE_MAX]; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 619 | int fd; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 620 | int rss = 0; |
| 621 | int total; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 622 | ssize_t ret; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 623 | |
| 624 | snprintf(path, PATH_MAX, "/proc/%d/statm", pid); |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 625 | fd = open(path, O_RDONLY | O_CLOEXEC); |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 626 | if (fd == -1) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 627 | return -1; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 628 | |
| 629 | ret = read_all(fd, line, sizeof(line) - 1); |
| 630 | if (ret < 0) { |
| 631 | close(fd); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 632 | return -1; |
| 633 | } |
| 634 | |
| 635 | sscanf(line, "%d %d ", &total, &rss); |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 636 | close(fd); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 637 | return rss; |
| 638 | } |
| 639 | |
| 640 | static char *proc_get_name(int pid) { |
| 641 | char path[PATH_MAX]; |
| 642 | static char line[LINE_MAX]; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 643 | int fd; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 644 | char *cp; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 645 | ssize_t ret; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 646 | |
| 647 | snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid); |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 648 | fd = open(path, O_RDONLY | O_CLOEXEC); |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 649 | if (fd == -1) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 650 | return NULL; |
Colin Cross | ce85d95 | 2014-07-11 17:53:27 -0700 | [diff] [blame] | 651 | ret = read_all(fd, line, sizeof(line) - 1); |
| 652 | close(fd); |
| 653 | if (ret < 0) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 654 | return NULL; |
| 655 | } |
| 656 | |
| 657 | cp = strchr(line, ' '); |
| 658 | if (cp) |
| 659 | *cp = '\0'; |
| 660 | |
| 661 | return line; |
| 662 | } |
| 663 | |
| 664 | static struct proc *proc_adj_lru(int oomadj) { |
| 665 | return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]); |
| 666 | } |
| 667 | |
Suren Baghdasaryan | 662492a | 2017-12-08 13:17:06 -0800 | [diff] [blame] | 668 | static struct proc *proc_get_heaviest(int oomadj) { |
| 669 | struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)]; |
| 670 | struct adjslot_list *curr = head->next; |
| 671 | struct proc *maxprocp = NULL; |
| 672 | int maxsize = 0; |
| 673 | while (curr != head) { |
| 674 | int pid = ((struct proc *)curr)->pid; |
| 675 | int tasksize = proc_get_size(pid); |
| 676 | if (tasksize <= 0) { |
| 677 | struct adjslot_list *next = curr->next; |
| 678 | pid_remove(pid); |
| 679 | curr = next; |
| 680 | } else { |
| 681 | if (tasksize > maxsize) { |
| 682 | maxsize = tasksize; |
| 683 | maxprocp = (struct proc *)curr; |
| 684 | } |
| 685 | curr = curr->next; |
| 686 | } |
| 687 | } |
| 688 | return maxprocp; |
| 689 | } |
| 690 | |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 691 | /* Kill one process specified by procp. Returns the size of the process killed */ |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 692 | static int kill_one_process(struct proc* procp, int min_score_adj, |
| 693 | enum vmpressure_level level) { |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 694 | int pid = procp->pid; |
| 695 | uid_t uid = procp->uid; |
| 696 | char *taskname; |
| 697 | int tasksize; |
| 698 | int r; |
| 699 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 700 | #ifdef LMKD_LOG_STATS |
Rajeev Kumar | 92b659b | 2018-02-21 19:08:15 -0800 | [diff] [blame] | 701 | struct memory_stat mem_st = {}; |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 702 | int memory_stat_parse_result = -1; |
| 703 | #endif |
| 704 | |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 705 | taskname = proc_get_name(pid); |
| 706 | if (!taskname) { |
| 707 | pid_remove(pid); |
| 708 | return -1; |
| 709 | } |
| 710 | |
| 711 | tasksize = proc_get_size(pid); |
| 712 | if (tasksize <= 0) { |
| 713 | pid_remove(pid); |
| 714 | return -1; |
| 715 | } |
| 716 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 717 | #ifdef LMKD_LOG_STATS |
| 718 | if (enable_stats_log) { |
| 719 | memory_stat_parse_result = memory_stat_parse(&mem_st, pid, uid); |
| 720 | } |
| 721 | #endif |
| 722 | |
Suren Baghdasaryan | c713559 | 2018-01-04 10:43:58 -0800 | [diff] [blame] | 723 | TRACE_KILL_START(pid); |
| 724 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 725 | r = kill(pid, SIGKILL); |
Robert Benea | caeaa65 | 2017-08-11 16:03:20 -0700 | [diff] [blame] | 726 | ALOGI( |
| 727 | "Killing '%s' (%d), uid %d, adj %d\n" |
| 728 | " to free %ldkB because system is under %s memory pressure oom_adj %d\n", |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 729 | taskname, pid, uid, procp->oomadj, tasksize * page_k, |
| 730 | level_name[level], min_score_adj); |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 731 | pid_remove(pid); |
| 732 | |
Suren Baghdasaryan | c713559 | 2018-01-04 10:43:58 -0800 | [diff] [blame] | 733 | TRACE_KILL_END(); |
| 734 | |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 735 | if (r) { |
Mark Salyzyn | 919f538 | 2018-02-04 15:27:23 -0800 | [diff] [blame] | 736 | ALOGE("kill(%d): errno=%d", pid, errno); |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 737 | return -1; |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 738 | } else { |
| 739 | #ifdef LMKD_LOG_STATS |
| 740 | if (memory_stat_parse_result == 0) { |
| 741 | stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname, |
| 742 | procp->oomadj, mem_st.pgfault, mem_st.pgmajfault, mem_st.rss_in_bytes, |
| 743 | mem_st.cache_in_bytes, mem_st.swap_in_bytes); |
| 744 | } |
| 745 | #endif |
| 746 | return tasksize; |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 747 | } |
Mark Salyzyn | 919f538 | 2018-02-04 15:27:23 -0800 | [diff] [blame] | 748 | |
| 749 | return tasksize; |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | /* |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 753 | * Find processes to kill to free required number of pages. |
| 754 | * If pages_to_free is set to 0 only one process will be killed. |
| 755 | * Returns the size of the killed processes. |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 756 | */ |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 757 | static int find_and_kill_processes(enum vmpressure_level level, |
| 758 | int pages_to_free) { |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 759 | int i; |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 760 | int killed_size; |
| 761 | int pages_freed = 0; |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 762 | int min_score_adj = level_oomadj[level]; |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 763 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 764 | #ifdef LMKD_LOG_STATS |
| 765 | if (enable_stats_log) { |
| 766 | stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, LMK_STATE_CHANGE_START); |
| 767 | } |
| 768 | #endif |
| 769 | |
Chong Zhang | 0a4acdf | 2015-10-14 16:19:53 -0700 | [diff] [blame] | 770 | for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) { |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 771 | struct proc *procp; |
| 772 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 773 | while (true) { |
Suren Baghdasaryan | 9ff66ff | 2018-04-13 11:49:54 -0700 | [diff] [blame^] | 774 | procp = kill_heaviest_task ? |
| 775 | proc_get_heaviest(i) : proc_adj_lru(i); |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 776 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 777 | if (!procp) |
| 778 | break; |
| 779 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 780 | killed_size = kill_one_process(procp, min_score_adj, level); |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 781 | if (killed_size >= 0) { |
| 782 | pages_freed += killed_size; |
| 783 | if (pages_freed >= pages_to_free) { |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 784 | |
| 785 | #ifdef LMKD_LOG_STATS |
| 786 | if (enable_stats_log) { |
| 787 | stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, |
| 788 | LMK_STATE_CHANGE_STOP); |
| 789 | } |
| 790 | #endif |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 791 | return pages_freed; |
| 792 | } |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 793 | } |
| 794 | } |
| 795 | } |
| 796 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 797 | #ifdef LMKD_LOG_STATS |
| 798 | if (enable_stats_log) { |
| 799 | stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, LMK_STATE_CHANGE_STOP); |
| 800 | } |
| 801 | #endif |
| 802 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 803 | return pages_freed; |
Colin Cross | 16b0946 | 2014-07-14 12:39:56 -0700 | [diff] [blame] | 804 | } |
| 805 | |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 806 | static int64_t get_memory_usage(const char* path) { |
| 807 | int ret; |
| 808 | int64_t mem_usage; |
| 809 | char buf[32]; |
| 810 | int fd = open(path, O_RDONLY | O_CLOEXEC); |
| 811 | if (fd == -1) { |
| 812 | ALOGE("%s open: errno=%d", path, errno); |
| 813 | return -1; |
| 814 | } |
| 815 | |
| 816 | ret = read_all(fd, buf, sizeof(buf) - 1); |
| 817 | close(fd); |
| 818 | if (ret < 0) { |
| 819 | ALOGE("%s error: errno=%d", path, errno); |
| 820 | return -1; |
| 821 | } |
| 822 | sscanf(buf, "%" SCNd64, &mem_usage); |
| 823 | if (mem_usage == 0) { |
| 824 | ALOGE("No memory!"); |
| 825 | return -1; |
| 826 | } |
| 827 | return mem_usage; |
| 828 | } |
| 829 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 830 | void record_low_pressure_levels(struct mem_size *free_mem) { |
| 831 | if (low_pressure_mem.min_free == -1 || |
| 832 | low_pressure_mem.min_free > free_mem->free_mem) { |
| 833 | if (debug_process_killing) { |
| 834 | ALOGI("Low pressure min memory update from %d to %d", |
| 835 | low_pressure_mem.min_free, free_mem->free_mem); |
| 836 | } |
| 837 | low_pressure_mem.min_free = free_mem->free_mem; |
| 838 | } |
| 839 | /* |
| 840 | * Free memory at low vmpressure events occasionally gets spikes, |
| 841 | * possibly a stale low vmpressure event with memory already |
| 842 | * freed up (no memory pressure should have been reported). |
| 843 | * Ignore large jumps in max_free that would mess up our stats. |
| 844 | */ |
| 845 | if (low_pressure_mem.max_free == -1 || |
| 846 | (low_pressure_mem.max_free < free_mem->free_mem && |
| 847 | free_mem->free_mem - low_pressure_mem.max_free < low_pressure_mem.max_free * 0.1)) { |
| 848 | if (debug_process_killing) { |
| 849 | ALOGI("Low pressure max memory update from %d to %d", |
| 850 | low_pressure_mem.max_free, free_mem->free_mem); |
| 851 | } |
| 852 | low_pressure_mem.max_free = free_mem->free_mem; |
| 853 | } |
| 854 | } |
| 855 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 856 | enum vmpressure_level upgrade_level(enum vmpressure_level level) { |
| 857 | return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ? |
| 858 | level + 1 : level); |
| 859 | } |
| 860 | |
| 861 | enum vmpressure_level downgrade_level(enum vmpressure_level level) { |
| 862 | return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ? |
| 863 | level - 1 : level); |
| 864 | } |
| 865 | |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 866 | static inline unsigned long get_time_diff_ms(struct timeval *from, |
| 867 | struct timeval *to) { |
| 868 | return (to->tv_sec - from->tv_sec) * 1000 + |
| 869 | (to->tv_usec - from->tv_usec) / 1000; |
| 870 | } |
| 871 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 872 | static void mp_event_common(int data, uint32_t events __unused) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 873 | int ret; |
| 874 | unsigned long long evcount; |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 875 | int64_t mem_usage, memsw_usage; |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 876 | int64_t mem_pressure; |
Suren Baghdasaryan | e82e15c | 2018-01-04 09:16:21 -0800 | [diff] [blame] | 877 | enum vmpressure_level lvl; |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 878 | struct mem_size free_mem; |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 879 | static struct timeval last_report_tm; |
| 880 | static unsigned long skip_count = 0; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 881 | enum vmpressure_level level = (enum vmpressure_level)data; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 882 | |
Suren Baghdasaryan | e82e15c | 2018-01-04 09:16:21 -0800 | [diff] [blame] | 883 | /* |
| 884 | * Check all event counters from low to critical |
| 885 | * and upgrade to the highest priority one. By reading |
| 886 | * eventfd we also reset the event counters. |
| 887 | */ |
| 888 | for (lvl = VMPRESS_LEVEL_LOW; lvl < VMPRESS_LEVEL_COUNT; lvl++) { |
| 889 | if (mpevfd[lvl] != -1 && |
| 890 | read(mpevfd[lvl], &evcount, sizeof(evcount)) > 0 && |
| 891 | evcount > 0 && lvl > level) { |
| 892 | level = lvl; |
| 893 | } |
| 894 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 895 | |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 896 | if (kill_timeout_ms) { |
| 897 | struct timeval curr_tm; |
| 898 | gettimeofday(&curr_tm, NULL); |
| 899 | if (get_time_diff_ms(&last_report_tm, &curr_tm) < kill_timeout_ms) { |
| 900 | skip_count++; |
| 901 | return; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | if (skip_count > 0) { |
| 906 | if (debug_process_killing) { |
| 907 | ALOGI("%lu memory pressure events were skipped after a kill!", |
| 908 | skip_count); |
| 909 | } |
| 910 | skip_count = 0; |
| 911 | } |
| 912 | |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 913 | if (get_free_memory(&free_mem) == 0) { |
| 914 | if (level == VMPRESS_LEVEL_LOW) { |
| 915 | record_low_pressure_levels(&free_mem); |
| 916 | } |
| 917 | } else { |
| 918 | ALOGE("Failed to get free memory!"); |
| 919 | return; |
| 920 | } |
| 921 | |
| 922 | if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) { |
| 923 | /* Do not monitor this pressure level */ |
| 924 | return; |
| 925 | } |
| 926 | |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 927 | mem_usage = get_memory_usage(MEMCG_MEMORY_USAGE); |
| 928 | memsw_usage = get_memory_usage(MEMCG_MEMORYSW_USAGE); |
| 929 | if (memsw_usage < 0 || mem_usage < 0) { |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 930 | goto do_kill; |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 931 | } |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 932 | |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 933 | // Calculate percent for swappinness. |
| 934 | mem_pressure = (mem_usage * 100) / memsw_usage; |
| 935 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 936 | if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) { |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 937 | // We are swapping too much. |
| 938 | if (mem_pressure < upgrade_pressure) { |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 939 | level = upgrade_level(level); |
| 940 | if (debug_process_killing) { |
| 941 | ALOGI("Event upgraded to %s", level_name[level]); |
| 942 | } |
Robert Benea | c47f299 | 2017-08-21 15:18:31 -0700 | [diff] [blame] | 943 | } |
| 944 | } |
| 945 | |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 946 | // If the pressure is larger than downgrade_pressure lmk will not |
| 947 | // kill any process, since enough memory is available. |
| 948 | if (mem_pressure > downgrade_pressure) { |
| 949 | if (debug_process_killing) { |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 950 | ALOGI("Ignore %s memory pressure", level_name[level]); |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 951 | } |
| 952 | return; |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 953 | } else if (level == VMPRESS_LEVEL_CRITICAL && |
| 954 | mem_pressure > upgrade_pressure) { |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 955 | if (debug_process_killing) { |
| 956 | ALOGI("Downgrade critical memory pressure"); |
| 957 | } |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 958 | // Downgrade event, since enough memory available. |
| 959 | level = downgrade_level(level); |
Robert Benea | 6e8e710 | 2017-09-13 15:20:30 -0700 | [diff] [blame] | 960 | } |
| 961 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 962 | do_kill: |
Suren Baghdasaryan | 39a22e7 | 2018-04-13 11:45:38 -0700 | [diff] [blame] | 963 | if (low_ram_device) { |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 964 | /* For Go devices kill only one task */ |
| 965 | if (find_and_kill_processes(level, 0) == 0) { |
| 966 | if (debug_process_killing) { |
| 967 | ALOGI("Nothing to kill"); |
| 968 | } |
| 969 | } |
| 970 | } else { |
| 971 | /* If pressure level is less than critical and enough free swap then ignore */ |
| 972 | if (level < VMPRESS_LEVEL_CRITICAL && free_mem.free_swap > low_pressure_mem.max_free) { |
| 973 | if (debug_process_killing) { |
| 974 | ALOGI("Ignoring pressure since %d swap pages are available ", free_mem.free_swap); |
| 975 | } |
| 976 | return; |
| 977 | } |
| 978 | |
| 979 | /* Free up enough memory to downgrate the memory pressure to low level */ |
| 980 | if (free_mem.free_mem < low_pressure_mem.max_free) { |
| 981 | int pages_to_free = low_pressure_mem.max_free - free_mem.free_mem; |
| 982 | if (debug_process_killing) { |
| 983 | ALOGI("Trying to free %d pages", pages_to_free); |
| 984 | } |
| 985 | int pages_freed = find_and_kill_processes(level, pages_to_free); |
| 986 | if (pages_freed < pages_to_free) { |
| 987 | if (debug_process_killing) { |
| 988 | ALOGI("Unable to free enough memory (pages freed=%d)", |
| 989 | pages_freed); |
| 990 | } |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 991 | } else { |
| 992 | gettimeofday(&last_report_tm, NULL); |
Suren Baghdasaryan | 65f54a2 | 2018-01-17 17:17:44 -0800 | [diff] [blame] | 993 | } |
Robert Benea | caeaa65 | 2017-08-11 16:03:20 -0700 | [diff] [blame] | 994 | } |
Colin Cross | f8857cc | 2014-07-11 17:16:56 -0700 | [diff] [blame] | 995 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 996 | } |
| 997 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 998 | static bool init_mp_common(enum vmpressure_level level) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 999 | int mpfd; |
| 1000 | int evfd; |
| 1001 | int evctlfd; |
| 1002 | char buf[256]; |
| 1003 | struct epoll_event epev; |
| 1004 | int ret; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1005 | int level_idx = (int)level; |
| 1006 | const char *levelstr = level_name[level_idx]; |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1007 | |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 1008 | mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1009 | if (mpfd < 0) { |
| 1010 | ALOGI("No kernel memory.pressure_level support (errno=%d)", errno); |
| 1011 | goto err_open_mpfd; |
| 1012 | } |
| 1013 | |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 1014 | evctlfd = open(MEMCG_SYSFS_PATH "cgroup.event_control", O_WRONLY | O_CLOEXEC); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1015 | if (evctlfd < 0) { |
| 1016 | ALOGI("No kernel memory cgroup event control (errno=%d)", errno); |
| 1017 | goto err_open_evctlfd; |
| 1018 | } |
| 1019 | |
Nick Kralevich | c68c886 | 2015-12-18 20:52:37 -0800 | [diff] [blame] | 1020 | evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1021 | if (evfd < 0) { |
| 1022 | ALOGE("eventfd failed for level %s; errno=%d", levelstr, errno); |
| 1023 | goto err_eventfd; |
| 1024 | } |
| 1025 | |
| 1026 | ret = snprintf(buf, sizeof(buf), "%d %d %s", evfd, mpfd, levelstr); |
| 1027 | if (ret >= (ssize_t)sizeof(buf)) { |
| 1028 | ALOGE("cgroup.event_control line overflow for level %s", levelstr); |
| 1029 | goto err; |
| 1030 | } |
| 1031 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1032 | ret = TEMP_FAILURE_RETRY(write(evctlfd, buf, strlen(buf) + 1)); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1033 | if (ret == -1) { |
| 1034 | ALOGE("cgroup.event_control write failed for level %s; errno=%d", |
| 1035 | levelstr, errno); |
| 1036 | goto err; |
| 1037 | } |
| 1038 | |
| 1039 | epev.events = EPOLLIN; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1040 | /* use data to store event level */ |
| 1041 | vmpressure_hinfo[level_idx].data = level_idx; |
| 1042 | vmpressure_hinfo[level_idx].handler = mp_event_common; |
| 1043 | epev.data.ptr = (void *)&vmpressure_hinfo[level_idx]; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1044 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, evfd, &epev); |
| 1045 | if (ret == -1) { |
| 1046 | ALOGE("epoll_ctl for level %s failed; errno=%d", levelstr, errno); |
| 1047 | goto err; |
| 1048 | } |
| 1049 | maxevents++; |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1050 | mpevfd[level] = evfd; |
Suren Baghdasaryan | 1bd2fc4 | 2018-01-04 08:54:53 -0800 | [diff] [blame] | 1051 | close(evctlfd); |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1052 | return true; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1053 | |
| 1054 | err: |
| 1055 | close(evfd); |
| 1056 | err_eventfd: |
| 1057 | close(evctlfd); |
| 1058 | err_open_evctlfd: |
| 1059 | close(mpfd); |
| 1060 | err_open_mpfd: |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1061 | return false; |
Robert Benea | 673e276 | 2017-06-01 16:32:31 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1064 | static int init(void) { |
| 1065 | struct epoll_event epev; |
| 1066 | int i; |
| 1067 | int ret; |
| 1068 | |
| 1069 | page_k = sysconf(_SC_PAGESIZE); |
| 1070 | if (page_k == -1) |
| 1071 | page_k = PAGE_SIZE; |
| 1072 | page_k /= 1024; |
| 1073 | |
| 1074 | epollfd = epoll_create(MAX_EPOLL_EVENTS); |
| 1075 | if (epollfd == -1) { |
| 1076 | ALOGE("epoll_create failed (errno=%d)", errno); |
| 1077 | return -1; |
| 1078 | } |
| 1079 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1080 | // mark data connections as not connected |
| 1081 | for (int i = 0; i < MAX_DATA_CONN; i++) { |
| 1082 | data_sock[i].sock = -1; |
| 1083 | } |
| 1084 | |
| 1085 | ctrl_sock.sock = android_get_control_socket("lmkd"); |
| 1086 | if (ctrl_sock.sock < 0) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1087 | ALOGE("get lmkd control socket failed"); |
| 1088 | return -1; |
| 1089 | } |
| 1090 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1091 | ret = listen(ctrl_sock.sock, MAX_DATA_CONN); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1092 | if (ret < 0) { |
| 1093 | ALOGE("lmkd control socket listen failed (errno=%d)", errno); |
| 1094 | return -1; |
| 1095 | } |
| 1096 | |
| 1097 | epev.events = EPOLLIN; |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1098 | ctrl_sock.handler_info.handler = ctrl_connect_handler; |
| 1099 | epev.data.ptr = (void *)&(ctrl_sock.handler_info); |
| 1100 | if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_sock.sock, &epev) == -1) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1101 | ALOGE("epoll_ctl for lmkd control socket failed (errno=%d)", errno); |
| 1102 | return -1; |
| 1103 | } |
| 1104 | maxevents++; |
| 1105 | |
Robert Benea | 164baeb | 2017-09-11 16:53:28 -0700 | [diff] [blame] | 1106 | has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK); |
Suren Baghdasaryan | 979591b | 2018-01-18 17:27:30 -0800 | [diff] [blame] | 1107 | use_inkernel_interface = has_inkernel_module; |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1108 | |
| 1109 | if (use_inkernel_interface) { |
| 1110 | ALOGI("Using in-kernel low memory killer interface"); |
| 1111 | } else { |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1112 | if (!init_mp_common(VMPRESS_LEVEL_LOW) || |
| 1113 | !init_mp_common(VMPRESS_LEVEL_MEDIUM) || |
| 1114 | !init_mp_common(VMPRESS_LEVEL_CRITICAL)) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1115 | ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer"); |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1116 | return -1; |
| 1117 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1118 | } |
| 1119 | |
Chong Zhang | 0a4acdf | 2015-10-14 16:19:53 -0700 | [diff] [blame] | 1120 | for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) { |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1121 | procadjslot_list[i].next = &procadjslot_list[i]; |
| 1122 | procadjslot_list[i].prev = &procadjslot_list[i]; |
| 1123 | } |
| 1124 | |
| 1125 | return 0; |
| 1126 | } |
| 1127 | |
| 1128 | static void mainloop(void) { |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1129 | struct event_handler_info* handler_info; |
| 1130 | struct epoll_event *evt; |
| 1131 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1132 | while (1) { |
| 1133 | struct epoll_event events[maxevents]; |
| 1134 | int nevents; |
| 1135 | int i; |
| 1136 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1137 | nevents = epoll_wait(epollfd, events, maxevents, -1); |
| 1138 | |
| 1139 | if (nevents == -1) { |
| 1140 | if (errno == EINTR) |
| 1141 | continue; |
| 1142 | ALOGE("epoll_wait failed (errno=%d)", errno); |
| 1143 | continue; |
| 1144 | } |
| 1145 | |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1146 | /* |
| 1147 | * First pass to see if any data socket connections were dropped. |
| 1148 | * Dropped connection should be handled before any other events |
| 1149 | * to deallocate data connection and correctly handle cases when |
| 1150 | * connection gets dropped and reestablished in the same epoll cycle. |
| 1151 | * In such cases it's essential to handle connection closures first. |
| 1152 | */ |
| 1153 | for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) { |
| 1154 | if ((evt->events & EPOLLHUP) && evt->data.ptr) { |
| 1155 | ALOGI("lmkd data connection dropped"); |
| 1156 | handler_info = (struct event_handler_info*)evt->data.ptr; |
| 1157 | ctrl_data_close(handler_info->data); |
| 1158 | } |
| 1159 | } |
| 1160 | |
| 1161 | /* Second pass to handle all other events */ |
| 1162 | for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) { |
| 1163 | if (evt->events & EPOLLERR) |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1164 | ALOGD("EPOLLERR on event #%d", i); |
Suren Baghdasaryan | 3cfb2c8 | 2018-01-26 12:51:19 -0800 | [diff] [blame] | 1165 | if (evt->events & EPOLLHUP) { |
| 1166 | /* This case was handled in the first pass */ |
| 1167 | continue; |
| 1168 | } |
| 1169 | if (evt->data.ptr) { |
| 1170 | handler_info = (struct event_handler_info*)evt->data.ptr; |
| 1171 | handler_info->handler(handler_info->data, evt->events); |
| 1172 | } |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1173 | } |
| 1174 | } |
| 1175 | } |
| 1176 | |
Mark Salyzyn | e6ed68b | 2014-04-30 13:36:35 -0700 | [diff] [blame] | 1177 | int main(int argc __unused, char **argv __unused) { |
Colin Cross | 1a0d9be | 2014-07-14 14:31:15 -0700 | [diff] [blame] | 1178 | struct sched_param param = { |
| 1179 | .sched_priority = 1, |
| 1180 | }; |
| 1181 | |
Suren Baghdasaryan | 96bf3a6 | 2017-12-08 12:58:52 -0800 | [diff] [blame] | 1182 | /* By default disable low level vmpressure events */ |
| 1183 | level_oomadj[VMPRESS_LEVEL_LOW] = |
| 1184 | property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1); |
| 1185 | level_oomadj[VMPRESS_LEVEL_MEDIUM] = |
| 1186 | property_get_int32("ro.lmk.medium", 800); |
| 1187 | level_oomadj[VMPRESS_LEVEL_CRITICAL] = |
| 1188 | property_get_int32("ro.lmk.critical", 0); |
Robert Benea | caeaa65 | 2017-08-11 16:03:20 -0700 | [diff] [blame] | 1189 | debug_process_killing = property_get_bool("ro.lmk.debug", false); |
Suren Baghdasaryan | ad2fd91 | 2017-12-08 13:08:41 -0800 | [diff] [blame] | 1190 | |
| 1191 | /* By default disable upgrade/downgrade logic */ |
| 1192 | enable_pressure_upgrade = |
| 1193 | property_get_bool("ro.lmk.critical_upgrade", false); |
| 1194 | upgrade_pressure = |
| 1195 | (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100); |
| 1196 | downgrade_pressure = |
| 1197 | (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100); |
Suren Baghdasaryan | 662492a | 2017-12-08 13:17:06 -0800 | [diff] [blame] | 1198 | kill_heaviest_task = |
Suren Baghdasaryan | 9ff66ff | 2018-04-13 11:49:54 -0700 | [diff] [blame^] | 1199 | property_get_bool("ro.lmk.kill_heaviest_task", false); |
Suren Baghdasaryan | 39a22e7 | 2018-04-13 11:45:38 -0700 | [diff] [blame] | 1200 | low_ram_device = property_get_bool("ro.config.low_ram", false); |
Suren Baghdasaryan | caa2dc5 | 2018-01-17 17:28:01 -0800 | [diff] [blame] | 1201 | kill_timeout_ms = |
| 1202 | (unsigned long)property_get_int32("ro.lmk.kill_timeout_ms", 0); |
Robert Benea | 58891d5 | 2017-07-31 17:15:20 -0700 | [diff] [blame] | 1203 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 1204 | #ifdef LMKD_LOG_STATS |
Rajeev Kumar | 1c669f7 | 2018-03-09 15:20:56 -0800 | [diff] [blame] | 1205 | statslog_init(&log_ctx, &enable_stats_log); |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 1206 | #endif |
| 1207 | |
Daniel Colascione | d39adf2 | 2018-01-05 14:59:55 -0800 | [diff] [blame] | 1208 | // MCL_ONFAULT pins pages as they fault instead of loading |
| 1209 | // everything immediately all at once. (Which would be bad, |
| 1210 | // because as of this writing, we have a lot of mapped pages we |
| 1211 | // never use.) Old kernels will see MCL_ONFAULT and fail with |
| 1212 | // EINVAL; we ignore this failure. |
| 1213 | // |
| 1214 | // N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT |
| 1215 | // pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault |
| 1216 | // in pages. |
| 1217 | if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && errno != EINVAL) |
Daniel Colascione | 4dd5d00 | 2018-01-03 12:01:02 -0800 | [diff] [blame] | 1218 | ALOGW("mlockall failed: errno=%d", errno); |
| 1219 | |
Colin Cross | 1a0d9be | 2014-07-14 14:31:15 -0700 | [diff] [blame] | 1220 | sched_setscheduler(0, SCHED_FIFO, ¶m); |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1221 | if (!init()) |
| 1222 | mainloop(); |
| 1223 | |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 1224 | #ifdef LMKD_LOG_STATS |
Rajeev Kumar | 1c669f7 | 2018-03-09 15:20:56 -0800 | [diff] [blame] | 1225 | statslog_destroy(&log_ctx); |
Rajeev Kumar | 7045003 | 2018-01-31 17:54:56 -0800 | [diff] [blame] | 1226 | #endif |
| 1227 | |
Todd Poynor | 3948f80 | 2013-07-09 19:35:14 -0700 | [diff] [blame] | 1228 | ALOGI("exiting"); |
| 1229 | return 0; |
| 1230 | } |