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Todd Poynor3948f802013-07-09 19:35:14 -07001/*
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 Beneac47f2992017-08-21 15:18:31 -070020#include <inttypes.h>
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -070021#include <pwd.h>
Mark Salyzyncfd5b082016-10-17 14:28:00 -070022#include <sched.h>
Todd Poynor3948f802013-07-09 19:35:14 -070023#include <signal.h>
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -070024#include <stdbool.h>
Todd Poynor3948f802013-07-09 19:35:14 -070025#include <stdlib.h>
26#include <string.h>
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070027#include <sys/cdefs.h>
Todd Poynor3948f802013-07-09 19:35:14 -070028#include <sys/epoll.h>
29#include <sys/eventfd.h>
Colin Crossb28ff912014-07-11 17:15:44 -070030#include <sys/mman.h>
Todd Poynor3948f802013-07-09 19:35:14 -070031#include <sys/socket.h>
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -080032#include <sys/sysinfo.h>
Mark Salyzyn721d7c72018-03-21 12:24:58 -070033#include <sys/types.h>
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070034#include <unistd.h>
35
Robert Benea58891d52017-07-31 17:15:20 -070036#include <cutils/properties.h>
Todd Poynor3948f802013-07-09 19:35:14 -070037#include <cutils/sockets.h>
Suren Baghdasaryan0f100512018-01-24 16:51:41 -080038#include <lmkd.h>
Mark Salyzyn30f991f2017-01-10 13:19:54 -080039#include <log/log.h>
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070040
Rajeev Kumar70450032018-01-31 17:54:56 -080041#ifdef LMKD_LOG_STATS
Yao Chen389aee12018-05-02 11:19:27 -070042#include "statslog.h"
Rajeev Kumar70450032018-01-31 17:54:56 -080043#endif
44
Suren Baghdasaryanc7135592018-01-04 10:43:58 -080045/*
46 * Define LMKD_TRACE_KILLS to record lmkd kills in kernel traces
47 * to profile and correlate with OOM kills
48 */
49#ifdef LMKD_TRACE_KILLS
50
51#define ATRACE_TAG ATRACE_TAG_ALWAYS
52#include <cutils/trace.h>
53
54#define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid);
55#define TRACE_KILL_END() ATRACE_INT(__FUNCTION__, 0);
56
57#else /* LMKD_TRACE_KILLS */
58
Daniel Colascione347f6b42018-02-12 11:24:47 -080059#define TRACE_KILL_START(pid) ((void)(pid))
60#define TRACE_KILL_END() ((void)0)
Suren Baghdasaryanc7135592018-01-04 10:43:58 -080061
62#endif /* LMKD_TRACE_KILLS */
63
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070064#ifndef __unused
65#define __unused __attribute__((__unused__))
66#endif
Todd Poynor3948f802013-07-09 19:35:14 -070067
68#define MEMCG_SYSFS_PATH "/dev/memcg/"
Robert Beneac47f2992017-08-21 15:18:31 -070069#define MEMCG_MEMORY_USAGE "/dev/memcg/memory.usage_in_bytes"
70#define MEMCG_MEMORYSW_USAGE "/dev/memcg/memory.memsw.usage_in_bytes"
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -070071#define ZONEINFO_PATH "/proc/zoneinfo"
72#define MEMINFO_PATH "/proc/meminfo"
Todd Poynor3948f802013-07-09 19:35:14 -070073#define LINE_MAX 128
74
Mark Salyzyn64d97d82018-04-09 09:50:32 -070075/* gid containing AID_SYSTEM required */
Todd Poynor3948f802013-07-09 19:35:14 -070076#define INKERNEL_MINFREE_PATH "/sys/module/lowmemorykiller/parameters/minfree"
77#define INKERNEL_ADJ_PATH "/sys/module/lowmemorykiller/parameters/adj"
78
79#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
Robert Benea673e2762017-06-01 16:32:31 -070080#define EIGHT_MEGA (1 << 23)
Todd Poynor3948f802013-07-09 19:35:14 -070081
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -070082/* Defined as ProcessList.SYSTEM_ADJ in ProcessList.java */
83#define SYSTEM_ADJ (-900)
84
Todd Poynor3948f802013-07-09 19:35:14 -070085/* default to old in-kernel interface if no memory pressure events */
Mark Salyzyn721d7c72018-03-21 12:24:58 -070086static bool use_inkernel_interface = true;
Robert Benea164baeb2017-09-11 16:53:28 -070087static bool has_inkernel_module;
Todd Poynor3948f802013-07-09 19:35:14 -070088
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -080089/* memory pressure levels */
90enum vmpressure_level {
91 VMPRESS_LEVEL_LOW = 0,
92 VMPRESS_LEVEL_MEDIUM,
93 VMPRESS_LEVEL_CRITICAL,
94 VMPRESS_LEVEL_COUNT
95};
Todd Poynor3948f802013-07-09 19:35:14 -070096
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -080097static const char *level_name[] = {
98 "low",
99 "medium",
100 "critical"
101};
102
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -0800103struct {
Suren Baghdasaryan9926e572018-04-13 13:41:12 -0700104 int64_t min_nr_free_pages; /* recorded but not used yet */
105 int64_t max_nr_free_pages;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -0800106} low_pressure_mem = { -1, -1 };
107
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -0800108static int level_oomadj[VMPRESS_LEVEL_COUNT];
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -0800109static int mpevfd[VMPRESS_LEVEL_COUNT] = { -1, -1, -1 };
Robert Beneac47f2992017-08-21 15:18:31 -0700110static bool debug_process_killing;
111static bool enable_pressure_upgrade;
112static int64_t upgrade_pressure;
Robert Benea6e8e7102017-09-13 15:20:30 -0700113static int64_t downgrade_pressure;
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -0700114static bool low_ram_device;
Suren Baghdasaryan662492a2017-12-08 13:17:06 -0800115static bool kill_heaviest_task;
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -0800116static unsigned long kill_timeout_ms;
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -0700117static bool use_minfree_levels;
Suren Baghdasaryance13cb52018-06-19 18:38:12 -0700118static bool per_app_memcg;
Vic Yang360a1132018-08-07 10:18:22 -0700119static int swap_free_low_percentage;
Robert Benea58891d52017-07-31 17:15:20 -0700120
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800121/* data required to handle events */
122struct event_handler_info {
123 int data;
124 void (*handler)(int data, uint32_t events);
125};
Todd Poynor3948f802013-07-09 19:35:14 -0700126
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800127/* data required to handle socket events */
128struct sock_event_handler_info {
129 int sock;
130 struct event_handler_info handler_info;
131};
132
133/* max supported number of data connections */
134#define MAX_DATA_CONN 2
135
136/* socket event handler data */
137static struct sock_event_handler_info ctrl_sock;
138static struct sock_event_handler_info data_sock[MAX_DATA_CONN];
139
140/* vmpressure event handler data */
141static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT];
142
143/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */
144#define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
Todd Poynor3948f802013-07-09 19:35:14 -0700145static int epollfd;
146static int maxevents;
147
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700148/* OOM score values used by both kernel and framework */
Todd Poynor16b60992013-09-16 19:26:47 -0700149#define OOM_SCORE_ADJ_MIN (-1000)
150#define OOM_SCORE_ADJ_MAX 1000
151
Todd Poynor3948f802013-07-09 19:35:14 -0700152static int lowmem_adj[MAX_TARGETS];
153static int lowmem_minfree[MAX_TARGETS];
154static int lowmem_targets_size;
155
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700156/* Fields to parse in /proc/zoneinfo */
157enum zoneinfo_field {
158 ZI_NR_FREE_PAGES = 0,
159 ZI_NR_FILE_PAGES,
160 ZI_NR_SHMEM,
161 ZI_NR_UNEVICTABLE,
162 ZI_WORKINGSET_REFAULT,
163 ZI_HIGH,
164 ZI_FIELD_COUNT
165};
166
167static const char* const zoneinfo_field_names[ZI_FIELD_COUNT] = {
168 "nr_free_pages",
169 "nr_file_pages",
170 "nr_shmem",
171 "nr_unevictable",
172 "workingset_refault",
173 "high",
174};
175
176union zoneinfo {
177 struct {
178 int64_t nr_free_pages;
179 int64_t nr_file_pages;
180 int64_t nr_shmem;
181 int64_t nr_unevictable;
182 int64_t workingset_refault;
183 int64_t high;
184 /* fields below are calculated rather than read from the file */
185 int64_t totalreserve_pages;
186 } field;
187 int64_t arr[ZI_FIELD_COUNT];
188};
189
190/* Fields to parse in /proc/meminfo */
191enum meminfo_field {
192 MI_NR_FREE_PAGES = 0,
193 MI_CACHED,
194 MI_SWAP_CACHED,
195 MI_BUFFERS,
196 MI_SHMEM,
197 MI_UNEVICTABLE,
Vic Yang360a1132018-08-07 10:18:22 -0700198 MI_TOTAL_SWAP,
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700199 MI_FREE_SWAP,
200 MI_DIRTY,
201 MI_FIELD_COUNT
202};
203
204static const char* const meminfo_field_names[MI_FIELD_COUNT] = {
205 "MemFree:",
206 "Cached:",
207 "SwapCached:",
208 "Buffers:",
209 "Shmem:",
210 "Unevictable:",
Vic Yang360a1132018-08-07 10:18:22 -0700211 "SwapTotal:",
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700212 "SwapFree:",
213 "Dirty:",
214};
215
216union meminfo {
217 struct {
218 int64_t nr_free_pages;
219 int64_t cached;
220 int64_t swap_cached;
221 int64_t buffers;
222 int64_t shmem;
223 int64_t unevictable;
Vic Yang360a1132018-08-07 10:18:22 -0700224 int64_t total_swap;
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700225 int64_t free_swap;
226 int64_t dirty;
227 /* fields below are calculated rather than read from the file */
228 int64_t nr_file_pages;
229 } field;
230 int64_t arr[MI_FIELD_COUNT];
231};
232
233enum field_match_result {
234 NO_MATCH,
235 PARSE_FAIL,
236 PARSE_SUCCESS
237};
238
Todd Poynor3948f802013-07-09 19:35:14 -0700239struct adjslot_list {
240 struct adjslot_list *next;
241 struct adjslot_list *prev;
242};
243
244struct proc {
245 struct adjslot_list asl;
246 int pid;
Colin Crossfbb78c62014-06-13 14:52:43 -0700247 uid_t uid;
Todd Poynor3948f802013-07-09 19:35:14 -0700248 int oomadj;
249 struct proc *pidhash_next;
250};
251
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700252struct reread_data {
253 const char* const filename;
254 int fd;
255};
256
Rajeev Kumar70450032018-01-31 17:54:56 -0800257#ifdef LMKD_LOG_STATS
Rajeev Kumar70450032018-01-31 17:54:56 -0800258static bool enable_stats_log;
259static android_log_context log_ctx;
260#endif
261
Todd Poynor3948f802013-07-09 19:35:14 -0700262#define PIDHASH_SZ 1024
263static struct proc *pidhash[PIDHASH_SZ];
264#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
265
Chih-Hung Hsiehdaa13ea2016-05-19 16:02:22 -0700266#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN)
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700267static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1];
Todd Poynor3948f802013-07-09 19:35:14 -0700268
Todd Poynor3948f802013-07-09 19:35:14 -0700269/* PAGE_SIZE / 1024 */
270static long page_k;
271
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700272static bool parse_int64(const char* str, int64_t* ret) {
273 char* endptr;
274 long long val = strtoll(str, &endptr, 10);
275 if (str == endptr || val > INT64_MAX) {
276 return false;
277 }
278 *ret = (int64_t)val;
279 return true;
280}
281
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700282static enum field_match_result match_field(const char* cp, const char* ap,
283 const char* const field_names[],
284 int field_count, int64_t* field,
285 int *field_idx) {
286 int64_t val;
287 int i;
288
289 for (i = 0; i < field_count; i++) {
290 if (!strcmp(cp, field_names[i])) {
291 *field_idx = i;
292 return parse_int64(ap, field) ? PARSE_SUCCESS : PARSE_FAIL;
293 }
294 }
295 return NO_MATCH;
296}
297
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700298/*
299 * Read file content from the beginning up to max_len bytes or EOF
300 * whichever happens first.
301 */
Colin Crossce85d952014-07-11 17:53:27 -0700302static ssize_t read_all(int fd, char *buf, size_t max_len)
303{
304 ssize_t ret = 0;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700305 off_t offset = 0;
Colin Crossce85d952014-07-11 17:53:27 -0700306
307 while (max_len > 0) {
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700308 ssize_t r = TEMP_FAILURE_RETRY(pread(fd, buf, max_len, offset));
Colin Crossce85d952014-07-11 17:53:27 -0700309 if (r == 0) {
310 break;
311 }
312 if (r == -1) {
313 return -1;
314 }
315 ret += r;
316 buf += r;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700317 offset += r;
Colin Crossce85d952014-07-11 17:53:27 -0700318 max_len -= r;
319 }
320
321 return ret;
322}
323
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700324/*
325 * Read a new or already opened file from the beginning.
326 * If the file has not been opened yet data->fd should be set to -1.
327 * To be used with files which are read often and possibly during high
328 * memory pressure to minimize file opening which by itself requires kernel
329 * memory allocation and might result in a stall on memory stressed system.
330 */
331static int reread_file(struct reread_data *data, char *buf, size_t buf_size) {
332 ssize_t size;
333
334 if (data->fd == -1) {
335 data->fd = open(data->filename, O_RDONLY | O_CLOEXEC);
336 if (data->fd == -1) {
337 ALOGE("%s open: %s", data->filename, strerror(errno));
338 return -1;
339 }
340 }
341
342 size = read_all(data->fd, buf, buf_size - 1);
343 if (size < 0) {
344 ALOGE("%s read: %s", data->filename, strerror(errno));
345 close(data->fd);
346 data->fd = -1;
347 return -1;
348 }
Chih-Hung Hsieh62b0ef52018-07-25 12:15:25 -0700349 ALOG_ASSERT((size_t)size < buf_size - 1, "%s too large", data->filename);
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700350 buf[size] = 0;
351
352 return 0;
353}
354
Todd Poynor3948f802013-07-09 19:35:14 -0700355static struct proc *pid_lookup(int pid) {
356 struct proc *procp;
357
358 for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid;
359 procp = procp->pidhash_next)
360 ;
361
362 return procp;
363}
364
365static void adjslot_insert(struct adjslot_list *head, struct adjslot_list *new)
366{
367 struct adjslot_list *next = head->next;
368 new->prev = head;
369 new->next = next;
370 next->prev = new;
371 head->next = new;
372}
373
374static void adjslot_remove(struct adjslot_list *old)
375{
376 struct adjslot_list *prev = old->prev;
377 struct adjslot_list *next = old->next;
378 next->prev = prev;
379 prev->next = next;
380}
381
382static struct adjslot_list *adjslot_tail(struct adjslot_list *head) {
383 struct adjslot_list *asl = head->prev;
384
385 return asl == head ? NULL : asl;
386}
387
388static void proc_slot(struct proc *procp) {
389 int adjslot = ADJTOSLOT(procp->oomadj);
390
391 adjslot_insert(&procadjslot_list[adjslot], &procp->asl);
392}
393
394static void proc_unslot(struct proc *procp) {
395 adjslot_remove(&procp->asl);
396}
397
398static void proc_insert(struct proc *procp) {
399 int hval = pid_hashfn(procp->pid);
400
401 procp->pidhash_next = pidhash[hval];
402 pidhash[hval] = procp;
403 proc_slot(procp);
404}
405
406static int pid_remove(int pid) {
407 int hval = pid_hashfn(pid);
408 struct proc *procp;
409 struct proc *prevp;
410
411 for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid;
412 procp = procp->pidhash_next)
413 prevp = procp;
414
415 if (!procp)
416 return -1;
417
418 if (!prevp)
419 pidhash[hval] = procp->pidhash_next;
420 else
421 prevp->pidhash_next = procp->pidhash_next;
422
423 proc_unslot(procp);
424 free(procp);
425 return 0;
426}
427
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700428/*
429 * Write a string to a file.
430 * Returns false if the file does not exist.
431 */
432static bool writefilestring(const char *path, const char *s,
433 bool err_if_missing) {
Nick Kralevichc68c8862015-12-18 20:52:37 -0800434 int fd = open(path, O_WRONLY | O_CLOEXEC);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700435 ssize_t len = strlen(s);
436 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700437
438 if (fd < 0) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700439 if (err_if_missing) {
440 ALOGE("Error opening %s; errno=%d", path, errno);
441 }
442 return false;
Todd Poynor3948f802013-07-09 19:35:14 -0700443 }
444
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700445 ret = TEMP_FAILURE_RETRY(write(fd, s, len));
Todd Poynor3948f802013-07-09 19:35:14 -0700446 if (ret < 0) {
447 ALOGE("Error writing %s; errno=%d", path, errno);
448 } else if (ret < len) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700449 ALOGE("Short write on %s; length=%zd", path, ret);
Todd Poynor3948f802013-07-09 19:35:14 -0700450 }
451
452 close(fd);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700453 return true;
Todd Poynor3948f802013-07-09 19:35:14 -0700454}
455
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800456static void cmd_procprio(LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700457 struct proc *procp;
458 char path[80];
459 char val[20];
Robert Benea673e2762017-06-01 16:32:31 -0700460 int soft_limit_mult;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800461 struct lmk_procprio params;
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -0700462 bool is_system_server;
463 struct passwd *pwdrec;
Todd Poynor3948f802013-07-09 19:35:14 -0700464
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800465 lmkd_pack_get_procprio(packet, &params);
466
467 if (params.oomadj < OOM_SCORE_ADJ_MIN ||
468 params.oomadj > OOM_SCORE_ADJ_MAX) {
469 ALOGE("Invalid PROCPRIO oomadj argument %d", params.oomadj);
Todd Poynor3948f802013-07-09 19:35:14 -0700470 return;
471 }
472
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700473 /* gid containing AID_READPROC required */
474 /* CAP_SYS_RESOURCE required */
475 /* CAP_DAC_OVERRIDE required */
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800476 snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", params.pid);
477 snprintf(val, sizeof(val), "%d", params.oomadj);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700478 if (!writefilestring(path, val, false)) {
479 ALOGW("Failed to open %s; errno=%d: process %d might have been killed",
480 path, errno, params.pid);
481 /* If this file does not exist the process is dead. */
482 return;
483 }
Todd Poynor3948f802013-07-09 19:35:14 -0700484
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700485 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700486 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700487 }
Todd Poynor3948f802013-07-09 19:35:14 -0700488
Suren Baghdasaryance13cb52018-06-19 18:38:12 -0700489 if (per_app_memcg) {
Suren Baghdasaryan20686f02018-05-18 14:42:00 -0700490 if (params.oomadj >= 900) {
491 soft_limit_mult = 0;
492 } else if (params.oomadj >= 800) {
493 soft_limit_mult = 0;
494 } else if (params.oomadj >= 700) {
495 soft_limit_mult = 0;
496 } else if (params.oomadj >= 600) {
497 // Launcher should be perceptible, don't kill it.
498 params.oomadj = 200;
499 soft_limit_mult = 1;
500 } else if (params.oomadj >= 500) {
501 soft_limit_mult = 0;
502 } else if (params.oomadj >= 400) {
503 soft_limit_mult = 0;
504 } else if (params.oomadj >= 300) {
505 soft_limit_mult = 1;
506 } else if (params.oomadj >= 200) {
507 soft_limit_mult = 2;
508 } else if (params.oomadj >= 100) {
509 soft_limit_mult = 10;
510 } else if (params.oomadj >= 0) {
511 soft_limit_mult = 20;
512 } else {
513 // Persistent processes will have a large
514 // soft limit 512MB.
515 soft_limit_mult = 64;
516 }
Robert Benea673e2762017-06-01 16:32:31 -0700517
Suren Baghdasaryan3862dd32018-05-21 19:48:47 -0700518 snprintf(path, sizeof(path), MEMCG_SYSFS_PATH
519 "apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
520 params.uid, params.pid);
Suren Baghdasaryan20686f02018-05-18 14:42:00 -0700521 snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
Suren Baghdasaryan3862dd32018-05-21 19:48:47 -0700522
523 /*
524 * system_server process has no memcg under /dev/memcg/apps but should be
525 * registered with lmkd. This is the best way so far to identify it.
526 */
527 is_system_server = (params.oomadj == SYSTEM_ADJ &&
528 (pwdrec = getpwnam("system")) != NULL &&
529 params.uid == pwdrec->pw_uid);
530 writefilestring(path, val, !is_system_server);
Robert Benea673e2762017-06-01 16:32:31 -0700531 }
532
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800533 procp = pid_lookup(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700534 if (!procp) {
535 procp = malloc(sizeof(struct proc));
536 if (!procp) {
537 // Oh, the irony. May need to rebuild our state.
538 return;
539 }
540
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800541 procp->pid = params.pid;
542 procp->uid = params.uid;
543 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700544 proc_insert(procp);
545 } else {
546 proc_unslot(procp);
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800547 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700548 proc_slot(procp);
549 }
550}
551
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800552static void cmd_procremove(LMKD_CTRL_PACKET packet) {
553 struct lmk_procremove params;
554
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700555 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700556 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700557 }
Todd Poynor3948f802013-07-09 19:35:14 -0700558
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800559 lmkd_pack_get_procremove(packet, &params);
560 pid_remove(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700561}
562
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800563static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700564 int i;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800565 struct lmk_target target;
Todd Poynor3948f802013-07-09 19:35:14 -0700566
567 if (ntargets > (int)ARRAY_SIZE(lowmem_adj))
568 return;
569
570 for (i = 0; i < ntargets; i++) {
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800571 lmkd_pack_get_target(packet, i, &target);
572 lowmem_minfree[i] = target.minfree;
573 lowmem_adj[i] = target.oom_adj_score;
Todd Poynor3948f802013-07-09 19:35:14 -0700574 }
575
576 lowmem_targets_size = ntargets;
577
Robert Benea164baeb2017-09-11 16:53:28 -0700578 if (has_inkernel_module) {
Todd Poynor3948f802013-07-09 19:35:14 -0700579 char minfreestr[128];
580 char killpriostr[128];
581
582 minfreestr[0] = '\0';
583 killpriostr[0] = '\0';
584
585 for (i = 0; i < lowmem_targets_size; i++) {
586 char val[40];
587
588 if (i) {
589 strlcat(minfreestr, ",", sizeof(minfreestr));
590 strlcat(killpriostr, ",", sizeof(killpriostr));
591 }
592
Robert Benea164baeb2017-09-11 16:53:28 -0700593 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700594 strlcat(minfreestr, val, sizeof(minfreestr));
Robert Benea164baeb2017-09-11 16:53:28 -0700595 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700596 strlcat(killpriostr, val, sizeof(killpriostr));
597 }
598
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700599 writefilestring(INKERNEL_MINFREE_PATH, minfreestr, true);
600 writefilestring(INKERNEL_ADJ_PATH, killpriostr, true);
Todd Poynor3948f802013-07-09 19:35:14 -0700601 }
602}
603
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800604static void ctrl_data_close(int dsock_idx) {
605 struct epoll_event epev;
606
607 ALOGI("closing lmkd data connection");
608 if (epoll_ctl(epollfd, EPOLL_CTL_DEL, data_sock[dsock_idx].sock, &epev) == -1) {
609 // Log a warning and keep going
610 ALOGW("epoll_ctl for data connection socket failed; errno=%d", errno);
611 }
Todd Poynor3948f802013-07-09 19:35:14 -0700612 maxevents--;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800613
614 close(data_sock[dsock_idx].sock);
615 data_sock[dsock_idx].sock = -1;
Todd Poynor3948f802013-07-09 19:35:14 -0700616}
617
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800618static int ctrl_data_read(int dsock_idx, char *buf, size_t bufsz) {
Todd Poynor3948f802013-07-09 19:35:14 -0700619 int ret = 0;
620
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700621 ret = TEMP_FAILURE_RETRY(read(data_sock[dsock_idx].sock, buf, bufsz));
Todd Poynor3948f802013-07-09 19:35:14 -0700622
623 if (ret == -1) {
624 ALOGE("control data socket read failed; errno=%d", errno);
625 } else if (ret == 0) {
626 ALOGE("Got EOF on control data socket");
627 ret = -1;
628 }
629
630 return ret;
631}
632
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800633static void ctrl_command_handler(int dsock_idx) {
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800634 LMKD_CTRL_PACKET packet;
Todd Poynor3948f802013-07-09 19:35:14 -0700635 int len;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800636 enum lmk_cmd cmd;
Todd Poynor3948f802013-07-09 19:35:14 -0700637 int nargs;
638 int targets;
639
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800640 len = ctrl_data_read(dsock_idx, (char *)packet, CTRL_PACKET_MAX_SIZE);
Todd Poynor3948f802013-07-09 19:35:14 -0700641 if (len <= 0)
642 return;
643
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800644 if (len < (int)sizeof(int)) {
645 ALOGE("Wrong control socket read length len=%d", len);
646 return;
647 }
648
649 cmd = lmkd_pack_get_cmd(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700650 nargs = len / sizeof(int) - 1;
651 if (nargs < 0)
652 goto wronglen;
653
Todd Poynor3948f802013-07-09 19:35:14 -0700654 switch(cmd) {
655 case LMK_TARGET:
656 targets = nargs / 2;
657 if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj))
658 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800659 cmd_target(targets, packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700660 break;
661 case LMK_PROCPRIO:
Colin Crossfbb78c62014-06-13 14:52:43 -0700662 if (nargs != 3)
Todd Poynor3948f802013-07-09 19:35:14 -0700663 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800664 cmd_procprio(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700665 break;
666 case LMK_PROCREMOVE:
667 if (nargs != 1)
668 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800669 cmd_procremove(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700670 break;
671 default:
672 ALOGE("Received unknown command code %d", cmd);
673 return;
674 }
675
676 return;
677
678wronglen:
679 ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len);
680}
681
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800682static void ctrl_data_handler(int data, uint32_t events) {
683 if (events & EPOLLIN) {
684 ctrl_command_handler(data);
Todd Poynor3948f802013-07-09 19:35:14 -0700685 }
686}
687
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800688static int get_free_dsock() {
689 for (int i = 0; i < MAX_DATA_CONN; i++) {
690 if (data_sock[i].sock < 0) {
691 return i;
692 }
693 }
694 return -1;
695}
Todd Poynor3948f802013-07-09 19:35:14 -0700696
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800697static void ctrl_connect_handler(int data __unused, uint32_t events __unused) {
698 struct epoll_event epev;
699 int free_dscock_idx = get_free_dsock();
700
701 if (free_dscock_idx < 0) {
702 /*
703 * Number of data connections exceeded max supported. This should not
704 * happen but if it does we drop all existing connections and accept
705 * the new one. This prevents inactive connections from monopolizing
706 * data socket and if we drop ActivityManager connection it will
707 * immediately reconnect.
708 */
709 for (int i = 0; i < MAX_DATA_CONN; i++) {
710 ctrl_data_close(i);
711 }
712 free_dscock_idx = 0;
Todd Poynor3948f802013-07-09 19:35:14 -0700713 }
714
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800715 data_sock[free_dscock_idx].sock = accept(ctrl_sock.sock, NULL, NULL);
716 if (data_sock[free_dscock_idx].sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700717 ALOGE("lmkd control socket accept failed; errno=%d", errno);
718 return;
719 }
720
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800721 ALOGI("lmkd data connection established");
722 /* use data to store data connection idx */
723 data_sock[free_dscock_idx].handler_info.data = free_dscock_idx;
724 data_sock[free_dscock_idx].handler_info.handler = ctrl_data_handler;
Todd Poynor3948f802013-07-09 19:35:14 -0700725 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800726 epev.data.ptr = (void *)&(data_sock[free_dscock_idx].handler_info);
727 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, data_sock[free_dscock_idx].sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -0700728 ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno);
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800729 ctrl_data_close(free_dscock_idx);
Todd Poynor3948f802013-07-09 19:35:14 -0700730 return;
731 }
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800732 maxevents++;
Todd Poynor3948f802013-07-09 19:35:14 -0700733}
734
Rajeev Kumar70450032018-01-31 17:54:56 -0800735#ifdef LMKD_LOG_STATS
736static void memory_stat_parse_line(char *line, struct memory_stat *mem_st) {
737 char key[LINE_MAX];
738 int64_t value;
739
740 sscanf(line,"%s %" SCNd64 "", key, &value);
741
742 if (strcmp(key, "total_") < 0) {
743 return;
744 }
745
746 if (!strcmp(key, "total_pgfault"))
747 mem_st->pgfault = value;
748 else if (!strcmp(key, "total_pgmajfault"))
749 mem_st->pgmajfault = value;
750 else if (!strcmp(key, "total_rss"))
751 mem_st->rss_in_bytes = value;
752 else if (!strcmp(key, "total_cache"))
753 mem_st->cache_in_bytes = value;
754 else if (!strcmp(key, "total_swap"))
755 mem_st->swap_in_bytes = value;
756}
757
758static int memory_stat_parse(struct memory_stat *mem_st, int pid, uid_t uid) {
759 FILE *fp;
760 char buf[PATH_MAX];
761
762 snprintf(buf, sizeof(buf), MEMCG_PROCESS_MEMORY_STAT_PATH, uid, pid);
763
764 fp = fopen(buf, "r");
765
766 if (fp == NULL) {
Rajeev Kumar92b659b2018-02-21 19:08:15 -0800767 ALOGE("%s open failed: %s", buf, strerror(errno));
Rajeev Kumar70450032018-01-31 17:54:56 -0800768 return -1;
769 }
770
771 while (fgets(buf, PAGE_SIZE, fp) != NULL ) {
772 memory_stat_parse_line(buf, mem_st);
773 }
774 fclose(fp);
775
776 return 0;
777}
778#endif
779
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700780/* /prop/zoneinfo parsing routines */
781static int64_t zoneinfo_parse_protection(char *cp) {
782 int64_t max = 0;
783 long long zoneval;
784 char *save_ptr;
785
786 for (cp = strtok_r(cp, "(), ", &save_ptr); cp;
787 cp = strtok_r(NULL, "), ", &save_ptr)) {
788 zoneval = strtoll(cp, &cp, 0);
789 if (zoneval > max) {
790 max = (zoneval > INT64_MAX) ? INT64_MAX : zoneval;
791 }
792 }
793
794 return max;
795}
796
797static bool zoneinfo_parse_line(char *line, union zoneinfo *zi) {
798 char *cp = line;
799 char *ap;
800 char *save_ptr;
801 int64_t val;
802 int field_idx;
803
804 cp = strtok_r(line, " ", &save_ptr);
805 if (!cp) {
806 return true;
807 }
808
809 if (!strcmp(cp, "protection:")) {
810 ap = strtok_r(NULL, ")", &save_ptr);
811 } else {
812 ap = strtok_r(NULL, " ", &save_ptr);
813 }
814
815 if (!ap) {
816 return true;
817 }
818
819 switch (match_field(cp, ap, zoneinfo_field_names,
820 ZI_FIELD_COUNT, &val, &field_idx)) {
821 case (PARSE_SUCCESS):
822 zi->arr[field_idx] += val;
823 break;
824 case (NO_MATCH):
825 if (!strcmp(cp, "protection:")) {
826 zi->field.totalreserve_pages +=
827 zoneinfo_parse_protection(ap);
828 }
829 break;
830 case (PARSE_FAIL):
831 default:
832 return false;
833 }
834 return true;
835}
836
837static int zoneinfo_parse(union zoneinfo *zi) {
838 static struct reread_data file_data = {
839 .filename = ZONEINFO_PATH,
840 .fd = -1,
841 };
842 char buf[PAGE_SIZE];
843 char *save_ptr;
844 char *line;
845
846 memset(zi, 0, sizeof(union zoneinfo));
847
848 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
849 return -1;
850 }
851
852 for (line = strtok_r(buf, "\n", &save_ptr); line;
853 line = strtok_r(NULL, "\n", &save_ptr)) {
854 if (!zoneinfo_parse_line(line, zi)) {
855 ALOGE("%s parse error", file_data.filename);
856 return -1;
857 }
858 }
859 zi->field.totalreserve_pages += zi->field.high;
860
861 return 0;
862}
863
864/* /prop/meminfo parsing routines */
865static bool meminfo_parse_line(char *line, union meminfo *mi) {
866 char *cp = line;
867 char *ap;
868 char *save_ptr;
869 int64_t val;
870 int field_idx;
871 enum field_match_result match_res;
872
873 cp = strtok_r(line, " ", &save_ptr);
874 if (!cp) {
875 return false;
876 }
877
878 ap = strtok_r(NULL, " ", &save_ptr);
879 if (!ap) {
880 return false;
881 }
882
883 match_res = match_field(cp, ap, meminfo_field_names, MI_FIELD_COUNT,
884 &val, &field_idx);
885 if (match_res == PARSE_SUCCESS) {
886 mi->arr[field_idx] = val / page_k;
887 }
888 return (match_res != PARSE_FAIL);
889}
890
891static int meminfo_parse(union meminfo *mi) {
892 static struct reread_data file_data = {
893 .filename = MEMINFO_PATH,
894 .fd = -1,
895 };
896 char buf[PAGE_SIZE];
897 char *save_ptr;
898 char *line;
899
900 memset(mi, 0, sizeof(union meminfo));
901
902 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
903 return -1;
904 }
905
906 for (line = strtok_r(buf, "\n", &save_ptr); line;
907 line = strtok_r(NULL, "\n", &save_ptr)) {
908 if (!meminfo_parse_line(line, mi)) {
909 ALOGE("%s parse error", file_data.filename);
910 return -1;
911 }
912 }
913 mi->field.nr_file_pages = mi->field.cached + mi->field.swap_cached +
914 mi->field.buffers;
915
916 return 0;
917}
918
Todd Poynor3948f802013-07-09 19:35:14 -0700919static int proc_get_size(int pid) {
920 char path[PATH_MAX];
921 char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700922 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700923 int rss = 0;
924 int total;
Colin Crossce85d952014-07-11 17:53:27 -0700925 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700926
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700927 /* gid containing AID_READPROC required */
Todd Poynor3948f802013-07-09 19:35:14 -0700928 snprintf(path, PATH_MAX, "/proc/%d/statm", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800929 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700930 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700931 return -1;
Colin Crossce85d952014-07-11 17:53:27 -0700932
933 ret = read_all(fd, line, sizeof(line) - 1);
934 if (ret < 0) {
935 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700936 return -1;
937 }
938
939 sscanf(line, "%d %d ", &total, &rss);
Colin Crossce85d952014-07-11 17:53:27 -0700940 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700941 return rss;
942}
943
944static char *proc_get_name(int pid) {
945 char path[PATH_MAX];
946 static char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700947 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700948 char *cp;
Colin Crossce85d952014-07-11 17:53:27 -0700949 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700950
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700951 /* gid containing AID_READPROC required */
Todd Poynor3948f802013-07-09 19:35:14 -0700952 snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800953 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700954 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700955 return NULL;
Colin Crossce85d952014-07-11 17:53:27 -0700956 ret = read_all(fd, line, sizeof(line) - 1);
957 close(fd);
958 if (ret < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700959 return NULL;
960 }
961
962 cp = strchr(line, ' ');
963 if (cp)
964 *cp = '\0';
965
966 return line;
967}
968
969static struct proc *proc_adj_lru(int oomadj) {
970 return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]);
971}
972
Suren Baghdasaryan662492a2017-12-08 13:17:06 -0800973static struct proc *proc_get_heaviest(int oomadj) {
974 struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)];
975 struct adjslot_list *curr = head->next;
976 struct proc *maxprocp = NULL;
977 int maxsize = 0;
978 while (curr != head) {
979 int pid = ((struct proc *)curr)->pid;
980 int tasksize = proc_get_size(pid);
981 if (tasksize <= 0) {
982 struct adjslot_list *next = curr->next;
983 pid_remove(pid);
984 curr = next;
985 } else {
986 if (tasksize > maxsize) {
987 maxsize = tasksize;
988 maxprocp = (struct proc *)curr;
989 }
990 curr = curr->next;
991 }
992 }
993 return maxprocp;
994}
995
Colin Cross16b09462014-07-14 12:39:56 -0700996/* Kill one process specified by procp. Returns the size of the process killed */
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -0800997static int kill_one_process(struct proc* procp, int min_score_adj,
998 enum vmpressure_level level) {
Colin Cross16b09462014-07-14 12:39:56 -0700999 int pid = procp->pid;
1000 uid_t uid = procp->uid;
1001 char *taskname;
1002 int tasksize;
1003 int r;
1004
Rajeev Kumar70450032018-01-31 17:54:56 -08001005#ifdef LMKD_LOG_STATS
Rajeev Kumar92b659b2018-02-21 19:08:15 -08001006 struct memory_stat mem_st = {};
Rajeev Kumar70450032018-01-31 17:54:56 -08001007 int memory_stat_parse_result = -1;
1008#endif
1009
Colin Cross16b09462014-07-14 12:39:56 -07001010 taskname = proc_get_name(pid);
1011 if (!taskname) {
1012 pid_remove(pid);
1013 return -1;
1014 }
1015
1016 tasksize = proc_get_size(pid);
1017 if (tasksize <= 0) {
1018 pid_remove(pid);
1019 return -1;
1020 }
1021
Rajeev Kumar70450032018-01-31 17:54:56 -08001022#ifdef LMKD_LOG_STATS
1023 if (enable_stats_log) {
1024 memory_stat_parse_result = memory_stat_parse(&mem_st, pid, uid);
1025 }
1026#endif
1027
Suren Baghdasaryanc7135592018-01-04 10:43:58 -08001028 TRACE_KILL_START(pid);
1029
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001030 /* CAP_KILL required */
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001031 r = kill(pid, SIGKILL);
Robert Beneacaeaa652017-08-11 16:03:20 -07001032 ALOGI(
1033 "Killing '%s' (%d), uid %d, adj %d\n"
Suren Baghdasaryand07a94f2018-03-20 16:25:54 -07001034 " to free %ldkB because system is under %s memory pressure (min_oom_adj=%d)\n",
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001035 taskname, pid, uid, procp->oomadj, tasksize * page_k,
1036 level_name[level], min_score_adj);
Colin Cross16b09462014-07-14 12:39:56 -07001037 pid_remove(pid);
1038
Suren Baghdasaryanc7135592018-01-04 10:43:58 -08001039 TRACE_KILL_END();
1040
Colin Cross16b09462014-07-14 12:39:56 -07001041 if (r) {
Mark Salyzyn919f5382018-02-04 15:27:23 -08001042 ALOGE("kill(%d): errno=%d", pid, errno);
Colin Cross16b09462014-07-14 12:39:56 -07001043 return -1;
Rajeev Kumar70450032018-01-31 17:54:56 -08001044 } else {
1045#ifdef LMKD_LOG_STATS
1046 if (memory_stat_parse_result == 0) {
1047 stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname,
1048 procp->oomadj, mem_st.pgfault, mem_st.pgmajfault, mem_st.rss_in_bytes,
1049 mem_st.cache_in_bytes, mem_st.swap_in_bytes);
1050 }
1051#endif
1052 return tasksize;
Colin Cross16b09462014-07-14 12:39:56 -07001053 }
Mark Salyzyn919f5382018-02-04 15:27:23 -08001054
1055 return tasksize;
Colin Cross16b09462014-07-14 12:39:56 -07001056}
1057
1058/*
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001059 * Find processes to kill to free required number of pages.
1060 * If pages_to_free is set to 0 only one process will be killed.
1061 * Returns the size of the killed processes.
Colin Cross16b09462014-07-14 12:39:56 -07001062 */
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001063static int find_and_kill_processes(enum vmpressure_level level,
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001064 int min_score_adj, int pages_to_free) {
Colin Cross16b09462014-07-14 12:39:56 -07001065 int i;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001066 int killed_size;
1067 int pages_freed = 0;
Colin Cross16b09462014-07-14 12:39:56 -07001068
Rajeev Kumar70450032018-01-31 17:54:56 -08001069#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001070 bool lmk_state_change_start = false;
Rajeev Kumar70450032018-01-31 17:54:56 -08001071#endif
1072
Chong Zhang0a4acdf2015-10-14 16:19:53 -07001073 for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
Colin Cross16b09462014-07-14 12:39:56 -07001074 struct proc *procp;
1075
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001076 while (true) {
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -07001077 procp = kill_heaviest_task ?
1078 proc_get_heaviest(i) : proc_adj_lru(i);
Colin Cross16b09462014-07-14 12:39:56 -07001079
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001080 if (!procp)
1081 break;
1082
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001083 killed_size = kill_one_process(procp, min_score_adj, level);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001084 if (killed_size >= 0) {
Yang Lu5564f4e2018-05-15 04:59:44 +00001085#ifdef LMKD_LOG_STATS
1086 if (enable_stats_log && !lmk_state_change_start) {
1087 lmk_state_change_start = true;
1088 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED,
1089 LMK_STATE_CHANGE_START);
1090 }
1091#endif
1092
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001093 pages_freed += killed_size;
1094 if (pages_freed >= pages_to_free) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001095
1096#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001097 if (enable_stats_log && lmk_state_change_start) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001098 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED,
1099 LMK_STATE_CHANGE_STOP);
1100 }
1101#endif
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001102 return pages_freed;
1103 }
Colin Cross16b09462014-07-14 12:39:56 -07001104 }
1105 }
1106 }
1107
Rajeev Kumar70450032018-01-31 17:54:56 -08001108#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001109 if (enable_stats_log && lmk_state_change_start) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001110 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, LMK_STATE_CHANGE_STOP);
1111 }
1112#endif
1113
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001114 return pages_freed;
Colin Cross16b09462014-07-14 12:39:56 -07001115}
1116
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001117static int64_t get_memory_usage(struct reread_data *file_data) {
Robert Beneac47f2992017-08-21 15:18:31 -07001118 int ret;
1119 int64_t mem_usage;
1120 char buf[32];
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001121
1122 if (reread_file(file_data, buf, sizeof(buf)) < 0) {
Robert Beneac47f2992017-08-21 15:18:31 -07001123 return -1;
1124 }
1125
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001126 if (!parse_int64(buf, &mem_usage)) {
1127 ALOGE("%s parse error", file_data->filename);
Robert Beneac47f2992017-08-21 15:18:31 -07001128 return -1;
1129 }
Robert Beneac47f2992017-08-21 15:18:31 -07001130 if (mem_usage == 0) {
1131 ALOGE("No memory!");
1132 return -1;
1133 }
1134 return mem_usage;
1135}
1136
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001137void record_low_pressure_levels(union meminfo *mi) {
1138 if (low_pressure_mem.min_nr_free_pages == -1 ||
1139 low_pressure_mem.min_nr_free_pages > mi->field.nr_free_pages) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001140 if (debug_process_killing) {
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001141 ALOGI("Low pressure min memory update from %" PRId64 " to %" PRId64,
1142 low_pressure_mem.min_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001143 }
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001144 low_pressure_mem.min_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001145 }
1146 /*
1147 * Free memory at low vmpressure events occasionally gets spikes,
1148 * possibly a stale low vmpressure event with memory already
1149 * freed up (no memory pressure should have been reported).
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001150 * Ignore large jumps in max_nr_free_pages that would mess up our stats.
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001151 */
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001152 if (low_pressure_mem.max_nr_free_pages == -1 ||
1153 (low_pressure_mem.max_nr_free_pages < mi->field.nr_free_pages &&
1154 mi->field.nr_free_pages - low_pressure_mem.max_nr_free_pages <
1155 low_pressure_mem.max_nr_free_pages * 0.1)) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001156 if (debug_process_killing) {
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001157 ALOGI("Low pressure max memory update from %" PRId64 " to %" PRId64,
1158 low_pressure_mem.max_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001159 }
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001160 low_pressure_mem.max_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001161 }
1162}
1163
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001164enum vmpressure_level upgrade_level(enum vmpressure_level level) {
1165 return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ?
1166 level + 1 : level);
1167}
1168
1169enum vmpressure_level downgrade_level(enum vmpressure_level level) {
1170 return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ?
1171 level - 1 : level);
1172}
1173
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001174static inline unsigned long get_time_diff_ms(struct timeval *from,
1175 struct timeval *to) {
1176 return (to->tv_sec - from->tv_sec) * 1000 +
1177 (to->tv_usec - from->tv_usec) / 1000;
1178}
1179
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001180static void mp_event_common(int data, uint32_t events __unused) {
Todd Poynor3948f802013-07-09 19:35:14 -07001181 int ret;
1182 unsigned long long evcount;
Robert Beneac47f2992017-08-21 15:18:31 -07001183 int64_t mem_usage, memsw_usage;
Robert Benea6e8e7102017-09-13 15:20:30 -07001184 int64_t mem_pressure;
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001185 enum vmpressure_level lvl;
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001186 union meminfo mi;
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001187 union zoneinfo zi;
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001188 static struct timeval last_report_tm;
1189 static unsigned long skip_count = 0;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001190 enum vmpressure_level level = (enum vmpressure_level)data;
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001191 long other_free = 0, other_file = 0;
1192 int min_score_adj;
1193 int pages_to_free = 0;
1194 int minfree = 0;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001195 static struct reread_data mem_usage_file_data = {
1196 .filename = MEMCG_MEMORY_USAGE,
1197 .fd = -1,
1198 };
1199 static struct reread_data memsw_usage_file_data = {
1200 .filename = MEMCG_MEMORYSW_USAGE,
1201 .fd = -1,
1202 };
Todd Poynor3948f802013-07-09 19:35:14 -07001203
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001204 /*
1205 * Check all event counters from low to critical
1206 * and upgrade to the highest priority one. By reading
1207 * eventfd we also reset the event counters.
1208 */
1209 for (lvl = VMPRESS_LEVEL_LOW; lvl < VMPRESS_LEVEL_COUNT; lvl++) {
1210 if (mpevfd[lvl] != -1 &&
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001211 TEMP_FAILURE_RETRY(read(mpevfd[lvl],
1212 &evcount, sizeof(evcount))) > 0 &&
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001213 evcount > 0 && lvl > level) {
1214 level = lvl;
1215 }
1216 }
Todd Poynor3948f802013-07-09 19:35:14 -07001217
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001218 if (kill_timeout_ms) {
1219 struct timeval curr_tm;
1220 gettimeofday(&curr_tm, NULL);
1221 if (get_time_diff_ms(&last_report_tm, &curr_tm) < kill_timeout_ms) {
1222 skip_count++;
1223 return;
1224 }
1225 }
1226
1227 if (skip_count > 0) {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001228 ALOGI("%lu memory pressure events were skipped after a kill!",
1229 skip_count);
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001230 skip_count = 0;
1231 }
1232
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001233 if (meminfo_parse(&mi) < 0 || zoneinfo_parse(&zi) < 0) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001234 ALOGE("Failed to get free memory!");
1235 return;
1236 }
1237
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001238 if (use_minfree_levels) {
1239 int i;
1240
1241 other_free = mi.field.nr_free_pages - zi.field.totalreserve_pages;
1242 if (mi.field.nr_file_pages > (mi.field.shmem + mi.field.unevictable + mi.field.swap_cached)) {
1243 other_file = (mi.field.nr_file_pages - mi.field.shmem -
1244 mi.field.unevictable - mi.field.swap_cached);
1245 } else {
1246 other_file = 0;
1247 }
1248
1249 min_score_adj = OOM_SCORE_ADJ_MAX + 1;
1250 for (i = 0; i < lowmem_targets_size; i++) {
1251 minfree = lowmem_minfree[i];
1252 if (other_free < minfree && other_file < minfree) {
1253 min_score_adj = lowmem_adj[i];
1254 break;
1255 }
1256 }
1257
Suren Baghdasaryan20686f02018-05-18 14:42:00 -07001258 if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
1259 if (debug_process_killing) {
1260 ALOGI("Ignore %s memory pressure event "
1261 "(free memory=%ldkB, cache=%ldkB, limit=%ldkB)",
1262 level_name[level], other_free * page_k, other_file * page_k,
1263 (long)lowmem_minfree[lowmem_targets_size - 1] * page_k);
1264 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001265 return;
Suren Baghdasaryan20686f02018-05-18 14:42:00 -07001266 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001267
1268 /* Free up enough pages to push over the highest minfree level */
1269 pages_to_free = lowmem_minfree[lowmem_targets_size - 1] -
1270 ((other_free < other_file) ? other_free : other_file);
1271 goto do_kill;
1272 }
1273
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001274 if (level == VMPRESS_LEVEL_LOW) {
1275 record_low_pressure_levels(&mi);
1276 }
1277
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001278 if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) {
1279 /* Do not monitor this pressure level */
1280 return;
1281 }
1282
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001283 if ((mem_usage = get_memory_usage(&mem_usage_file_data)) < 0) {
1284 goto do_kill;
1285 }
1286 if ((memsw_usage = get_memory_usage(&memsw_usage_file_data)) < 0) {
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001287 goto do_kill;
Robert Benea6e8e7102017-09-13 15:20:30 -07001288 }
Robert Beneac47f2992017-08-21 15:18:31 -07001289
Robert Benea6e8e7102017-09-13 15:20:30 -07001290 // Calculate percent for swappinness.
1291 mem_pressure = (mem_usage * 100) / memsw_usage;
1292
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001293 if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) {
Robert Benea6e8e7102017-09-13 15:20:30 -07001294 // We are swapping too much.
1295 if (mem_pressure < upgrade_pressure) {
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001296 level = upgrade_level(level);
1297 if (debug_process_killing) {
1298 ALOGI("Event upgraded to %s", level_name[level]);
1299 }
Robert Beneac47f2992017-08-21 15:18:31 -07001300 }
1301 }
1302
Vic Yang360a1132018-08-07 10:18:22 -07001303 // If we still have enough swap space available, check if we want to
1304 // ignore/downgrade pressure events.
1305 if (mi.field.free_swap >=
1306 mi.field.total_swap * swap_free_low_percentage / 100) {
1307 // If the pressure is larger than downgrade_pressure lmk will not
1308 // kill any process, since enough memory is available.
1309 if (mem_pressure > downgrade_pressure) {
1310 if (debug_process_killing) {
1311 ALOGI("Ignore %s memory pressure", level_name[level]);
1312 }
1313 return;
1314 } else if (level == VMPRESS_LEVEL_CRITICAL && mem_pressure > upgrade_pressure) {
1315 if (debug_process_killing) {
1316 ALOGI("Downgrade critical memory pressure");
1317 }
1318 // Downgrade event, since enough memory available.
1319 level = downgrade_level(level);
Robert Benea6e8e7102017-09-13 15:20:30 -07001320 }
Robert Benea6e8e7102017-09-13 15:20:30 -07001321 }
1322
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001323do_kill:
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001324 if (low_ram_device) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001325 /* For Go devices kill only one task */
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001326 if (find_and_kill_processes(level, level_oomadj[level], 0) == 0) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001327 if (debug_process_killing) {
1328 ALOGI("Nothing to kill");
1329 }
1330 }
1331 } else {
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001332 int pages_freed;
1333
1334 if (!use_minfree_levels) {
1335 /* If pressure level is less than critical and enough free swap then ignore */
1336 if (level < VMPRESS_LEVEL_CRITICAL &&
1337 mi.field.free_swap > low_pressure_mem.max_nr_free_pages) {
1338 if (debug_process_killing) {
1339 ALOGI("Ignoring pressure since %" PRId64
1340 " swap pages are available ",
1341 mi.field.free_swap);
1342 }
1343 return;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001344 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001345 /* Free up enough memory to downgrate the memory pressure to low level */
1346 if (mi.field.nr_free_pages < low_pressure_mem.max_nr_free_pages) {
1347 pages_to_free = low_pressure_mem.max_nr_free_pages -
1348 mi.field.nr_free_pages;
1349 } else {
1350 if (debug_process_killing) {
1351 ALOGI("Ignoring pressure since more memory is "
1352 "available (%" PRId64 ") than watermark (%" PRId64 ")",
1353 mi.field.nr_free_pages, low_pressure_mem.max_nr_free_pages);
1354 }
1355 return;
1356 }
1357 min_score_adj = level_oomadj[level];
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001358 }
1359
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001360 pages_freed = find_and_kill_processes(level, min_score_adj, pages_to_free);
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001361
1362 if (use_minfree_levels) {
1363 ALOGI("Killing because cache %ldkB is below "
1364 "limit %ldkB for oom_adj %d\n"
1365 " Free memory is %ldkB %s reserved",
1366 other_file * page_k, minfree * page_k, min_score_adj,
1367 other_free * page_k, other_free >= 0 ? "above" : "below");
1368 }
1369
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001370 if (pages_freed < pages_to_free) {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001371 ALOGI("Unable to free enough memory (pages to free=%d, pages freed=%d)",
1372 pages_to_free, pages_freed);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001373 } else {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001374 ALOGI("Reclaimed enough memory (pages to free=%d, pages freed=%d)",
1375 pages_to_free, pages_freed);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001376 gettimeofday(&last_report_tm, NULL);
Robert Beneacaeaa652017-08-11 16:03:20 -07001377 }
Colin Crossf8857cc2014-07-11 17:16:56 -07001378 }
Todd Poynor3948f802013-07-09 19:35:14 -07001379}
1380
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001381static bool init_mp_common(enum vmpressure_level level) {
Todd Poynor3948f802013-07-09 19:35:14 -07001382 int mpfd;
1383 int evfd;
1384 int evctlfd;
1385 char buf[256];
1386 struct epoll_event epev;
1387 int ret;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001388 int level_idx = (int)level;
1389 const char *levelstr = level_name[level_idx];
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001390
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001391 /* gid containing AID_SYSTEM required */
Nick Kralevichc68c8862015-12-18 20:52:37 -08001392 mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001393 if (mpfd < 0) {
1394 ALOGI("No kernel memory.pressure_level support (errno=%d)", errno);
1395 goto err_open_mpfd;
1396 }
1397
Nick Kralevichc68c8862015-12-18 20:52:37 -08001398 evctlfd = open(MEMCG_SYSFS_PATH "cgroup.event_control", O_WRONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001399 if (evctlfd < 0) {
1400 ALOGI("No kernel memory cgroup event control (errno=%d)", errno);
1401 goto err_open_evctlfd;
1402 }
1403
Nick Kralevichc68c8862015-12-18 20:52:37 -08001404 evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001405 if (evfd < 0) {
1406 ALOGE("eventfd failed for level %s; errno=%d", levelstr, errno);
1407 goto err_eventfd;
1408 }
1409
1410 ret = snprintf(buf, sizeof(buf), "%d %d %s", evfd, mpfd, levelstr);
1411 if (ret >= (ssize_t)sizeof(buf)) {
1412 ALOGE("cgroup.event_control line overflow for level %s", levelstr);
1413 goto err;
1414 }
1415
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001416 ret = TEMP_FAILURE_RETRY(write(evctlfd, buf, strlen(buf) + 1));
Todd Poynor3948f802013-07-09 19:35:14 -07001417 if (ret == -1) {
1418 ALOGE("cgroup.event_control write failed for level %s; errno=%d",
1419 levelstr, errno);
1420 goto err;
1421 }
1422
1423 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001424 /* use data to store event level */
1425 vmpressure_hinfo[level_idx].data = level_idx;
1426 vmpressure_hinfo[level_idx].handler = mp_event_common;
1427 epev.data.ptr = (void *)&vmpressure_hinfo[level_idx];
Todd Poynor3948f802013-07-09 19:35:14 -07001428 ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, evfd, &epev);
1429 if (ret == -1) {
1430 ALOGE("epoll_ctl for level %s failed; errno=%d", levelstr, errno);
1431 goto err;
1432 }
1433 maxevents++;
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001434 mpevfd[level] = evfd;
Suren Baghdasaryan1bd2fc42018-01-04 08:54:53 -08001435 close(evctlfd);
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001436 return true;
Todd Poynor3948f802013-07-09 19:35:14 -07001437
1438err:
1439 close(evfd);
1440err_eventfd:
1441 close(evctlfd);
1442err_open_evctlfd:
1443 close(mpfd);
1444err_open_mpfd:
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001445 return false;
Robert Benea673e2762017-06-01 16:32:31 -07001446}
1447
Todd Poynor3948f802013-07-09 19:35:14 -07001448static int init(void) {
1449 struct epoll_event epev;
1450 int i;
1451 int ret;
1452
1453 page_k = sysconf(_SC_PAGESIZE);
1454 if (page_k == -1)
1455 page_k = PAGE_SIZE;
1456 page_k /= 1024;
1457
1458 epollfd = epoll_create(MAX_EPOLL_EVENTS);
1459 if (epollfd == -1) {
1460 ALOGE("epoll_create failed (errno=%d)", errno);
1461 return -1;
1462 }
1463
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001464 // mark data connections as not connected
1465 for (int i = 0; i < MAX_DATA_CONN; i++) {
1466 data_sock[i].sock = -1;
1467 }
1468
1469 ctrl_sock.sock = android_get_control_socket("lmkd");
1470 if (ctrl_sock.sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -07001471 ALOGE("get lmkd control socket failed");
1472 return -1;
1473 }
1474
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001475 ret = listen(ctrl_sock.sock, MAX_DATA_CONN);
Todd Poynor3948f802013-07-09 19:35:14 -07001476 if (ret < 0) {
1477 ALOGE("lmkd control socket listen failed (errno=%d)", errno);
1478 return -1;
1479 }
1480
1481 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001482 ctrl_sock.handler_info.handler = ctrl_connect_handler;
1483 epev.data.ptr = (void *)&(ctrl_sock.handler_info);
1484 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_sock.sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -07001485 ALOGE("epoll_ctl for lmkd control socket failed (errno=%d)", errno);
1486 return -1;
1487 }
1488 maxevents++;
1489
Robert Benea164baeb2017-09-11 16:53:28 -07001490 has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK);
Suren Baghdasaryan979591b2018-01-18 17:27:30 -08001491 use_inkernel_interface = has_inkernel_module;
Todd Poynor3948f802013-07-09 19:35:14 -07001492
1493 if (use_inkernel_interface) {
1494 ALOGI("Using in-kernel low memory killer interface");
1495 } else {
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001496 if (!init_mp_common(VMPRESS_LEVEL_LOW) ||
1497 !init_mp_common(VMPRESS_LEVEL_MEDIUM) ||
1498 !init_mp_common(VMPRESS_LEVEL_CRITICAL)) {
Todd Poynor3948f802013-07-09 19:35:14 -07001499 ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001500 return -1;
1501 }
Todd Poynor3948f802013-07-09 19:35:14 -07001502 }
1503
Chong Zhang0a4acdf2015-10-14 16:19:53 -07001504 for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
Todd Poynor3948f802013-07-09 19:35:14 -07001505 procadjslot_list[i].next = &procadjslot_list[i];
1506 procadjslot_list[i].prev = &procadjslot_list[i];
1507 }
1508
1509 return 0;
1510}
1511
1512static void mainloop(void) {
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001513 struct event_handler_info* handler_info;
1514 struct epoll_event *evt;
1515
Todd Poynor3948f802013-07-09 19:35:14 -07001516 while (1) {
1517 struct epoll_event events[maxevents];
1518 int nevents;
1519 int i;
1520
Todd Poynor3948f802013-07-09 19:35:14 -07001521 nevents = epoll_wait(epollfd, events, maxevents, -1);
1522
1523 if (nevents == -1) {
1524 if (errno == EINTR)
1525 continue;
1526 ALOGE("epoll_wait failed (errno=%d)", errno);
1527 continue;
1528 }
1529
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001530 /*
1531 * First pass to see if any data socket connections were dropped.
1532 * Dropped connection should be handled before any other events
1533 * to deallocate data connection and correctly handle cases when
1534 * connection gets dropped and reestablished in the same epoll cycle.
1535 * In such cases it's essential to handle connection closures first.
1536 */
1537 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1538 if ((evt->events & EPOLLHUP) && evt->data.ptr) {
1539 ALOGI("lmkd data connection dropped");
1540 handler_info = (struct event_handler_info*)evt->data.ptr;
1541 ctrl_data_close(handler_info->data);
1542 }
1543 }
1544
1545 /* Second pass to handle all other events */
1546 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1547 if (evt->events & EPOLLERR)
Todd Poynor3948f802013-07-09 19:35:14 -07001548 ALOGD("EPOLLERR on event #%d", i);
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001549 if (evt->events & EPOLLHUP) {
1550 /* This case was handled in the first pass */
1551 continue;
1552 }
1553 if (evt->data.ptr) {
1554 handler_info = (struct event_handler_info*)evt->data.ptr;
1555 handler_info->handler(handler_info->data, evt->events);
1556 }
Todd Poynor3948f802013-07-09 19:35:14 -07001557 }
1558 }
1559}
1560
Mark Salyzyne6ed68b2014-04-30 13:36:35 -07001561int main(int argc __unused, char **argv __unused) {
Colin Cross1a0d9be2014-07-14 14:31:15 -07001562 struct sched_param param = {
1563 .sched_priority = 1,
1564 };
1565
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001566 /* By default disable low level vmpressure events */
1567 level_oomadj[VMPRESS_LEVEL_LOW] =
1568 property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1);
1569 level_oomadj[VMPRESS_LEVEL_MEDIUM] =
1570 property_get_int32("ro.lmk.medium", 800);
1571 level_oomadj[VMPRESS_LEVEL_CRITICAL] =
1572 property_get_int32("ro.lmk.critical", 0);
Robert Beneacaeaa652017-08-11 16:03:20 -07001573 debug_process_killing = property_get_bool("ro.lmk.debug", false);
Suren Baghdasaryanad2fd912017-12-08 13:08:41 -08001574
1575 /* By default disable upgrade/downgrade logic */
1576 enable_pressure_upgrade =
1577 property_get_bool("ro.lmk.critical_upgrade", false);
1578 upgrade_pressure =
1579 (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100);
1580 downgrade_pressure =
1581 (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100);
Suren Baghdasaryan662492a2017-12-08 13:17:06 -08001582 kill_heaviest_task =
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -07001583 property_get_bool("ro.lmk.kill_heaviest_task", false);
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001584 low_ram_device = property_get_bool("ro.config.low_ram", false);
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001585 kill_timeout_ms =
1586 (unsigned long)property_get_int32("ro.lmk.kill_timeout_ms", 0);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001587 use_minfree_levels =
1588 property_get_bool("ro.lmk.use_minfree_levels", false);
Suren Baghdasaryance13cb52018-06-19 18:38:12 -07001589 per_app_memcg =
1590 property_get_bool("ro.config.per_app_memcg", low_ram_device);
Vic Yang360a1132018-08-07 10:18:22 -07001591 swap_free_low_percentage =
1592 property_get_int32("ro.lmk.swap_free_low_percentage", 10);
Robert Benea58891d52017-07-31 17:15:20 -07001593
Rajeev Kumar70450032018-01-31 17:54:56 -08001594#ifdef LMKD_LOG_STATS
Rajeev Kumar1c669f72018-03-09 15:20:56 -08001595 statslog_init(&log_ctx, &enable_stats_log);
Rajeev Kumar70450032018-01-31 17:54:56 -08001596#endif
1597
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001598 if (!init()) {
1599 if (!use_inkernel_interface) {
1600 /*
1601 * MCL_ONFAULT pins pages as they fault instead of loading
1602 * everything immediately all at once. (Which would be bad,
1603 * because as of this writing, we have a lot of mapped pages we
1604 * never use.) Old kernels will see MCL_ONFAULT and fail with
1605 * EINVAL; we ignore this failure.
1606 *
1607 * N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT
1608 * pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault
1609 * in pages.
1610 */
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001611 /* CAP_IPC_LOCK required */
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001612 if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && (errno != EINVAL)) {
1613 ALOGW("mlockall failed %s", strerror(errno));
1614 }
Daniel Colascione4dd5d002018-01-03 12:01:02 -08001615
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001616 /* CAP_NICE required */
1617 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1618 ALOGW("set SCHED_FIFO failed %s", strerror(errno));
1619 }
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001620 }
1621
Todd Poynor3948f802013-07-09 19:35:14 -07001622 mainloop();
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001623 }
Todd Poynor3948f802013-07-09 19:35:14 -07001624
Rajeev Kumar70450032018-01-31 17:54:56 -08001625#ifdef LMKD_LOG_STATS
Rajeev Kumar1c669f72018-03-09 15:20:56 -08001626 statslog_destroy(&log_ctx);
Rajeev Kumar70450032018-01-31 17:54:56 -08001627#endif
1628
Todd Poynor3948f802013-07-09 19:35:14 -07001629 ALOGI("exiting");
1630 return 0;
1631}