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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;
Robert Benea58891d52017-07-31 17:15:20 -0700119
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800120/* data required to handle events */
121struct event_handler_info {
122 int data;
123 void (*handler)(int data, uint32_t events);
124};
Todd Poynor3948f802013-07-09 19:35:14 -0700125
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800126/* data required to handle socket events */
127struct sock_event_handler_info {
128 int sock;
129 struct event_handler_info handler_info;
130};
131
132/* max supported number of data connections */
133#define MAX_DATA_CONN 2
134
135/* socket event handler data */
136static struct sock_event_handler_info ctrl_sock;
137static struct sock_event_handler_info data_sock[MAX_DATA_CONN];
138
139/* vmpressure event handler data */
140static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT];
141
142/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */
143#define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
Todd Poynor3948f802013-07-09 19:35:14 -0700144static int epollfd;
145static int maxevents;
146
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700147/* OOM score values used by both kernel and framework */
Todd Poynor16b60992013-09-16 19:26:47 -0700148#define OOM_SCORE_ADJ_MIN (-1000)
149#define OOM_SCORE_ADJ_MAX 1000
150
Todd Poynor3948f802013-07-09 19:35:14 -0700151static int lowmem_adj[MAX_TARGETS];
152static int lowmem_minfree[MAX_TARGETS];
153static int lowmem_targets_size;
154
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700155/* Fields to parse in /proc/zoneinfo */
156enum zoneinfo_field {
157 ZI_NR_FREE_PAGES = 0,
158 ZI_NR_FILE_PAGES,
159 ZI_NR_SHMEM,
160 ZI_NR_UNEVICTABLE,
161 ZI_WORKINGSET_REFAULT,
162 ZI_HIGH,
163 ZI_FIELD_COUNT
164};
165
166static const char* const zoneinfo_field_names[ZI_FIELD_COUNT] = {
167 "nr_free_pages",
168 "nr_file_pages",
169 "nr_shmem",
170 "nr_unevictable",
171 "workingset_refault",
172 "high",
173};
174
175union zoneinfo {
176 struct {
177 int64_t nr_free_pages;
178 int64_t nr_file_pages;
179 int64_t nr_shmem;
180 int64_t nr_unevictable;
181 int64_t workingset_refault;
182 int64_t high;
183 /* fields below are calculated rather than read from the file */
184 int64_t totalreserve_pages;
185 } field;
186 int64_t arr[ZI_FIELD_COUNT];
187};
188
189/* Fields to parse in /proc/meminfo */
190enum meminfo_field {
191 MI_NR_FREE_PAGES = 0,
192 MI_CACHED,
193 MI_SWAP_CACHED,
194 MI_BUFFERS,
195 MI_SHMEM,
196 MI_UNEVICTABLE,
197 MI_FREE_SWAP,
198 MI_DIRTY,
199 MI_FIELD_COUNT
200};
201
202static const char* const meminfo_field_names[MI_FIELD_COUNT] = {
203 "MemFree:",
204 "Cached:",
205 "SwapCached:",
206 "Buffers:",
207 "Shmem:",
208 "Unevictable:",
209 "SwapFree:",
210 "Dirty:",
211};
212
213union meminfo {
214 struct {
215 int64_t nr_free_pages;
216 int64_t cached;
217 int64_t swap_cached;
218 int64_t buffers;
219 int64_t shmem;
220 int64_t unevictable;
221 int64_t free_swap;
222 int64_t dirty;
223 /* fields below are calculated rather than read from the file */
224 int64_t nr_file_pages;
225 } field;
226 int64_t arr[MI_FIELD_COUNT];
227};
228
229enum field_match_result {
230 NO_MATCH,
231 PARSE_FAIL,
232 PARSE_SUCCESS
233};
234
Todd Poynor3948f802013-07-09 19:35:14 -0700235struct adjslot_list {
236 struct adjslot_list *next;
237 struct adjslot_list *prev;
238};
239
240struct proc {
241 struct adjslot_list asl;
242 int pid;
Colin Crossfbb78c62014-06-13 14:52:43 -0700243 uid_t uid;
Todd Poynor3948f802013-07-09 19:35:14 -0700244 int oomadj;
245 struct proc *pidhash_next;
246};
247
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700248struct reread_data {
249 const char* const filename;
250 int fd;
251};
252
Rajeev Kumar70450032018-01-31 17:54:56 -0800253#ifdef LMKD_LOG_STATS
Rajeev Kumar70450032018-01-31 17:54:56 -0800254static bool enable_stats_log;
255static android_log_context log_ctx;
256#endif
257
Todd Poynor3948f802013-07-09 19:35:14 -0700258#define PIDHASH_SZ 1024
259static struct proc *pidhash[PIDHASH_SZ];
260#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
261
Chih-Hung Hsiehdaa13ea2016-05-19 16:02:22 -0700262#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN)
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700263static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1];
Todd Poynor3948f802013-07-09 19:35:14 -0700264
Todd Poynor3948f802013-07-09 19:35:14 -0700265/* PAGE_SIZE / 1024 */
266static long page_k;
267
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700268static bool parse_int64(const char* str, int64_t* ret) {
269 char* endptr;
270 long long val = strtoll(str, &endptr, 10);
271 if (str == endptr || val > INT64_MAX) {
272 return false;
273 }
274 *ret = (int64_t)val;
275 return true;
276}
277
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700278static enum field_match_result match_field(const char* cp, const char* ap,
279 const char* const field_names[],
280 int field_count, int64_t* field,
281 int *field_idx) {
282 int64_t val;
283 int i;
284
285 for (i = 0; i < field_count; i++) {
286 if (!strcmp(cp, field_names[i])) {
287 *field_idx = i;
288 return parse_int64(ap, field) ? PARSE_SUCCESS : PARSE_FAIL;
289 }
290 }
291 return NO_MATCH;
292}
293
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700294/*
295 * Read file content from the beginning up to max_len bytes or EOF
296 * whichever happens first.
297 */
Colin Crossce85d952014-07-11 17:53:27 -0700298static ssize_t read_all(int fd, char *buf, size_t max_len)
299{
300 ssize_t ret = 0;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700301 off_t offset = 0;
Colin Crossce85d952014-07-11 17:53:27 -0700302
303 while (max_len > 0) {
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700304 ssize_t r = TEMP_FAILURE_RETRY(pread(fd, buf, max_len, offset));
Colin Crossce85d952014-07-11 17:53:27 -0700305 if (r == 0) {
306 break;
307 }
308 if (r == -1) {
309 return -1;
310 }
311 ret += r;
312 buf += r;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700313 offset += r;
Colin Crossce85d952014-07-11 17:53:27 -0700314 max_len -= r;
315 }
316
317 return ret;
318}
319
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700320/*
321 * Read a new or already opened file from the beginning.
322 * If the file has not been opened yet data->fd should be set to -1.
323 * To be used with files which are read often and possibly during high
324 * memory pressure to minimize file opening which by itself requires kernel
325 * memory allocation and might result in a stall on memory stressed system.
326 */
327static int reread_file(struct reread_data *data, char *buf, size_t buf_size) {
328 ssize_t size;
329
330 if (data->fd == -1) {
331 data->fd = open(data->filename, O_RDONLY | O_CLOEXEC);
332 if (data->fd == -1) {
333 ALOGE("%s open: %s", data->filename, strerror(errno));
334 return -1;
335 }
336 }
337
338 size = read_all(data->fd, buf, buf_size - 1);
339 if (size < 0) {
340 ALOGE("%s read: %s", data->filename, strerror(errno));
341 close(data->fd);
342 data->fd = -1;
343 return -1;
344 }
Chih-Hung Hsieh62b0ef52018-07-25 12:15:25 -0700345 ALOG_ASSERT((size_t)size < buf_size - 1, "%s too large", data->filename);
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700346 buf[size] = 0;
347
348 return 0;
349}
350
Todd Poynor3948f802013-07-09 19:35:14 -0700351static struct proc *pid_lookup(int pid) {
352 struct proc *procp;
353
354 for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid;
355 procp = procp->pidhash_next)
356 ;
357
358 return procp;
359}
360
361static void adjslot_insert(struct adjslot_list *head, struct adjslot_list *new)
362{
363 struct adjslot_list *next = head->next;
364 new->prev = head;
365 new->next = next;
366 next->prev = new;
367 head->next = new;
368}
369
370static void adjslot_remove(struct adjslot_list *old)
371{
372 struct adjslot_list *prev = old->prev;
373 struct adjslot_list *next = old->next;
374 next->prev = prev;
375 prev->next = next;
376}
377
378static struct adjslot_list *adjslot_tail(struct adjslot_list *head) {
379 struct adjslot_list *asl = head->prev;
380
381 return asl == head ? NULL : asl;
382}
383
384static void proc_slot(struct proc *procp) {
385 int adjslot = ADJTOSLOT(procp->oomadj);
386
387 adjslot_insert(&procadjslot_list[adjslot], &procp->asl);
388}
389
390static void proc_unslot(struct proc *procp) {
391 adjslot_remove(&procp->asl);
392}
393
394static void proc_insert(struct proc *procp) {
395 int hval = pid_hashfn(procp->pid);
396
397 procp->pidhash_next = pidhash[hval];
398 pidhash[hval] = procp;
399 proc_slot(procp);
400}
401
402static int pid_remove(int pid) {
403 int hval = pid_hashfn(pid);
404 struct proc *procp;
405 struct proc *prevp;
406
407 for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid;
408 procp = procp->pidhash_next)
409 prevp = procp;
410
411 if (!procp)
412 return -1;
413
414 if (!prevp)
415 pidhash[hval] = procp->pidhash_next;
416 else
417 prevp->pidhash_next = procp->pidhash_next;
418
419 proc_unslot(procp);
420 free(procp);
421 return 0;
422}
423
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700424/*
425 * Write a string to a file.
426 * Returns false if the file does not exist.
427 */
428static bool writefilestring(const char *path, const char *s,
429 bool err_if_missing) {
Nick Kralevichc68c8862015-12-18 20:52:37 -0800430 int fd = open(path, O_WRONLY | O_CLOEXEC);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700431 ssize_t len = strlen(s);
432 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700433
434 if (fd < 0) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700435 if (err_if_missing) {
436 ALOGE("Error opening %s; errno=%d", path, errno);
437 }
438 return false;
Todd Poynor3948f802013-07-09 19:35:14 -0700439 }
440
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700441 ret = TEMP_FAILURE_RETRY(write(fd, s, len));
Todd Poynor3948f802013-07-09 19:35:14 -0700442 if (ret < 0) {
443 ALOGE("Error writing %s; errno=%d", path, errno);
444 } else if (ret < len) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700445 ALOGE("Short write on %s; length=%zd", path, ret);
Todd Poynor3948f802013-07-09 19:35:14 -0700446 }
447
448 close(fd);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700449 return true;
Todd Poynor3948f802013-07-09 19:35:14 -0700450}
451
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800452static void cmd_procprio(LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700453 struct proc *procp;
454 char path[80];
455 char val[20];
Robert Benea673e2762017-06-01 16:32:31 -0700456 int soft_limit_mult;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800457 struct lmk_procprio params;
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -0700458 bool is_system_server;
459 struct passwd *pwdrec;
Todd Poynor3948f802013-07-09 19:35:14 -0700460
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800461 lmkd_pack_get_procprio(packet, &params);
462
463 if (params.oomadj < OOM_SCORE_ADJ_MIN ||
464 params.oomadj > OOM_SCORE_ADJ_MAX) {
465 ALOGE("Invalid PROCPRIO oomadj argument %d", params.oomadj);
Todd Poynor3948f802013-07-09 19:35:14 -0700466 return;
467 }
468
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700469 /* gid containing AID_READPROC required */
470 /* CAP_SYS_RESOURCE required */
471 /* CAP_DAC_OVERRIDE required */
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800472 snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", params.pid);
473 snprintf(val, sizeof(val), "%d", params.oomadj);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700474 if (!writefilestring(path, val, false)) {
475 ALOGW("Failed to open %s; errno=%d: process %d might have been killed",
476 path, errno, params.pid);
477 /* If this file does not exist the process is dead. */
478 return;
479 }
Todd Poynor3948f802013-07-09 19:35:14 -0700480
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700481 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700482 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700483 }
Todd Poynor3948f802013-07-09 19:35:14 -0700484
Suren Baghdasaryance13cb52018-06-19 18:38:12 -0700485 if (per_app_memcg) {
Suren Baghdasaryan20686f02018-05-18 14:42:00 -0700486 if (params.oomadj >= 900) {
487 soft_limit_mult = 0;
488 } else if (params.oomadj >= 800) {
489 soft_limit_mult = 0;
490 } else if (params.oomadj >= 700) {
491 soft_limit_mult = 0;
492 } else if (params.oomadj >= 600) {
493 // Launcher should be perceptible, don't kill it.
494 params.oomadj = 200;
495 soft_limit_mult = 1;
496 } else if (params.oomadj >= 500) {
497 soft_limit_mult = 0;
498 } else if (params.oomadj >= 400) {
499 soft_limit_mult = 0;
500 } else if (params.oomadj >= 300) {
501 soft_limit_mult = 1;
502 } else if (params.oomadj >= 200) {
503 soft_limit_mult = 2;
504 } else if (params.oomadj >= 100) {
505 soft_limit_mult = 10;
506 } else if (params.oomadj >= 0) {
507 soft_limit_mult = 20;
508 } else {
509 // Persistent processes will have a large
510 // soft limit 512MB.
511 soft_limit_mult = 64;
512 }
Robert Benea673e2762017-06-01 16:32:31 -0700513
Suren Baghdasaryan3862dd32018-05-21 19:48:47 -0700514 snprintf(path, sizeof(path), MEMCG_SYSFS_PATH
515 "apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
516 params.uid, params.pid);
Suren Baghdasaryan20686f02018-05-18 14:42:00 -0700517 snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
Suren Baghdasaryan3862dd32018-05-21 19:48:47 -0700518
519 /*
520 * system_server process has no memcg under /dev/memcg/apps but should be
521 * registered with lmkd. This is the best way so far to identify it.
522 */
523 is_system_server = (params.oomadj == SYSTEM_ADJ &&
524 (pwdrec = getpwnam("system")) != NULL &&
525 params.uid == pwdrec->pw_uid);
526 writefilestring(path, val, !is_system_server);
Robert Benea673e2762017-06-01 16:32:31 -0700527 }
528
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800529 procp = pid_lookup(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700530 if (!procp) {
531 procp = malloc(sizeof(struct proc));
532 if (!procp) {
533 // Oh, the irony. May need to rebuild our state.
534 return;
535 }
536
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800537 procp->pid = params.pid;
538 procp->uid = params.uid;
539 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700540 proc_insert(procp);
541 } else {
542 proc_unslot(procp);
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800543 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700544 proc_slot(procp);
545 }
546}
547
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800548static void cmd_procremove(LMKD_CTRL_PACKET packet) {
549 struct lmk_procremove params;
550
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700551 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700552 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700553 }
Todd Poynor3948f802013-07-09 19:35:14 -0700554
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800555 lmkd_pack_get_procremove(packet, &params);
556 pid_remove(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700557}
558
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800559static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700560 int i;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800561 struct lmk_target target;
Todd Poynor3948f802013-07-09 19:35:14 -0700562
563 if (ntargets > (int)ARRAY_SIZE(lowmem_adj))
564 return;
565
566 for (i = 0; i < ntargets; i++) {
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800567 lmkd_pack_get_target(packet, i, &target);
568 lowmem_minfree[i] = target.minfree;
569 lowmem_adj[i] = target.oom_adj_score;
Todd Poynor3948f802013-07-09 19:35:14 -0700570 }
571
572 lowmem_targets_size = ntargets;
573
Robert Benea164baeb2017-09-11 16:53:28 -0700574 if (has_inkernel_module) {
Todd Poynor3948f802013-07-09 19:35:14 -0700575 char minfreestr[128];
576 char killpriostr[128];
577
578 minfreestr[0] = '\0';
579 killpriostr[0] = '\0';
580
581 for (i = 0; i < lowmem_targets_size; i++) {
582 char val[40];
583
584 if (i) {
585 strlcat(minfreestr, ",", sizeof(minfreestr));
586 strlcat(killpriostr, ",", sizeof(killpriostr));
587 }
588
Robert Benea164baeb2017-09-11 16:53:28 -0700589 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700590 strlcat(minfreestr, val, sizeof(minfreestr));
Robert Benea164baeb2017-09-11 16:53:28 -0700591 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700592 strlcat(killpriostr, val, sizeof(killpriostr));
593 }
594
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700595 writefilestring(INKERNEL_MINFREE_PATH, minfreestr, true);
596 writefilestring(INKERNEL_ADJ_PATH, killpriostr, true);
Todd Poynor3948f802013-07-09 19:35:14 -0700597 }
598}
599
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800600static void ctrl_data_close(int dsock_idx) {
601 struct epoll_event epev;
602
603 ALOGI("closing lmkd data connection");
604 if (epoll_ctl(epollfd, EPOLL_CTL_DEL, data_sock[dsock_idx].sock, &epev) == -1) {
605 // Log a warning and keep going
606 ALOGW("epoll_ctl for data connection socket failed; errno=%d", errno);
607 }
Todd Poynor3948f802013-07-09 19:35:14 -0700608 maxevents--;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800609
610 close(data_sock[dsock_idx].sock);
611 data_sock[dsock_idx].sock = -1;
Todd Poynor3948f802013-07-09 19:35:14 -0700612}
613
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800614static int ctrl_data_read(int dsock_idx, char *buf, size_t bufsz) {
Todd Poynor3948f802013-07-09 19:35:14 -0700615 int ret = 0;
616
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700617 ret = TEMP_FAILURE_RETRY(read(data_sock[dsock_idx].sock, buf, bufsz));
Todd Poynor3948f802013-07-09 19:35:14 -0700618
619 if (ret == -1) {
620 ALOGE("control data socket read failed; errno=%d", errno);
621 } else if (ret == 0) {
622 ALOGE("Got EOF on control data socket");
623 ret = -1;
624 }
625
626 return ret;
627}
628
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800629static void ctrl_command_handler(int dsock_idx) {
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800630 LMKD_CTRL_PACKET packet;
Todd Poynor3948f802013-07-09 19:35:14 -0700631 int len;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800632 enum lmk_cmd cmd;
Todd Poynor3948f802013-07-09 19:35:14 -0700633 int nargs;
634 int targets;
635
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800636 len = ctrl_data_read(dsock_idx, (char *)packet, CTRL_PACKET_MAX_SIZE);
Todd Poynor3948f802013-07-09 19:35:14 -0700637 if (len <= 0)
638 return;
639
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800640 if (len < (int)sizeof(int)) {
641 ALOGE("Wrong control socket read length len=%d", len);
642 return;
643 }
644
645 cmd = lmkd_pack_get_cmd(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700646 nargs = len / sizeof(int) - 1;
647 if (nargs < 0)
648 goto wronglen;
649
Todd Poynor3948f802013-07-09 19:35:14 -0700650 switch(cmd) {
651 case LMK_TARGET:
652 targets = nargs / 2;
653 if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj))
654 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800655 cmd_target(targets, packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700656 break;
657 case LMK_PROCPRIO:
Colin Crossfbb78c62014-06-13 14:52:43 -0700658 if (nargs != 3)
Todd Poynor3948f802013-07-09 19:35:14 -0700659 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800660 cmd_procprio(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700661 break;
662 case LMK_PROCREMOVE:
663 if (nargs != 1)
664 goto wronglen;
Suren Baghdasaryan0f100512018-01-24 16:51:41 -0800665 cmd_procremove(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700666 break;
667 default:
668 ALOGE("Received unknown command code %d", cmd);
669 return;
670 }
671
672 return;
673
674wronglen:
675 ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len);
676}
677
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800678static void ctrl_data_handler(int data, uint32_t events) {
679 if (events & EPOLLIN) {
680 ctrl_command_handler(data);
Todd Poynor3948f802013-07-09 19:35:14 -0700681 }
682}
683
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800684static int get_free_dsock() {
685 for (int i = 0; i < MAX_DATA_CONN; i++) {
686 if (data_sock[i].sock < 0) {
687 return i;
688 }
689 }
690 return -1;
691}
Todd Poynor3948f802013-07-09 19:35:14 -0700692
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800693static void ctrl_connect_handler(int data __unused, uint32_t events __unused) {
694 struct epoll_event epev;
695 int free_dscock_idx = get_free_dsock();
696
697 if (free_dscock_idx < 0) {
698 /*
699 * Number of data connections exceeded max supported. This should not
700 * happen but if it does we drop all existing connections and accept
701 * the new one. This prevents inactive connections from monopolizing
702 * data socket and if we drop ActivityManager connection it will
703 * immediately reconnect.
704 */
705 for (int i = 0; i < MAX_DATA_CONN; i++) {
706 ctrl_data_close(i);
707 }
708 free_dscock_idx = 0;
Todd Poynor3948f802013-07-09 19:35:14 -0700709 }
710
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800711 data_sock[free_dscock_idx].sock = accept(ctrl_sock.sock, NULL, NULL);
712 if (data_sock[free_dscock_idx].sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700713 ALOGE("lmkd control socket accept failed; errno=%d", errno);
714 return;
715 }
716
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800717 ALOGI("lmkd data connection established");
718 /* use data to store data connection idx */
719 data_sock[free_dscock_idx].handler_info.data = free_dscock_idx;
720 data_sock[free_dscock_idx].handler_info.handler = ctrl_data_handler;
Todd Poynor3948f802013-07-09 19:35:14 -0700721 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800722 epev.data.ptr = (void *)&(data_sock[free_dscock_idx].handler_info);
723 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, data_sock[free_dscock_idx].sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -0700724 ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno);
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800725 ctrl_data_close(free_dscock_idx);
Todd Poynor3948f802013-07-09 19:35:14 -0700726 return;
727 }
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -0800728 maxevents++;
Todd Poynor3948f802013-07-09 19:35:14 -0700729}
730
Rajeev Kumar70450032018-01-31 17:54:56 -0800731#ifdef LMKD_LOG_STATS
732static void memory_stat_parse_line(char *line, struct memory_stat *mem_st) {
733 char key[LINE_MAX];
734 int64_t value;
735
736 sscanf(line,"%s %" SCNd64 "", key, &value);
737
738 if (strcmp(key, "total_") < 0) {
739 return;
740 }
741
742 if (!strcmp(key, "total_pgfault"))
743 mem_st->pgfault = value;
744 else if (!strcmp(key, "total_pgmajfault"))
745 mem_st->pgmajfault = value;
746 else if (!strcmp(key, "total_rss"))
747 mem_st->rss_in_bytes = value;
748 else if (!strcmp(key, "total_cache"))
749 mem_st->cache_in_bytes = value;
750 else if (!strcmp(key, "total_swap"))
751 mem_st->swap_in_bytes = value;
752}
753
754static int memory_stat_parse(struct memory_stat *mem_st, int pid, uid_t uid) {
755 FILE *fp;
756 char buf[PATH_MAX];
757
758 snprintf(buf, sizeof(buf), MEMCG_PROCESS_MEMORY_STAT_PATH, uid, pid);
759
760 fp = fopen(buf, "r");
761
762 if (fp == NULL) {
Rajeev Kumar92b659b2018-02-21 19:08:15 -0800763 ALOGE("%s open failed: %s", buf, strerror(errno));
Rajeev Kumar70450032018-01-31 17:54:56 -0800764 return -1;
765 }
766
767 while (fgets(buf, PAGE_SIZE, fp) != NULL ) {
768 memory_stat_parse_line(buf, mem_st);
769 }
770 fclose(fp);
771
772 return 0;
773}
774#endif
775
Suren Baghdasaryan8b9deaf2018-04-13 13:11:51 -0700776/* /prop/zoneinfo parsing routines */
777static int64_t zoneinfo_parse_protection(char *cp) {
778 int64_t max = 0;
779 long long zoneval;
780 char *save_ptr;
781
782 for (cp = strtok_r(cp, "(), ", &save_ptr); cp;
783 cp = strtok_r(NULL, "), ", &save_ptr)) {
784 zoneval = strtoll(cp, &cp, 0);
785 if (zoneval > max) {
786 max = (zoneval > INT64_MAX) ? INT64_MAX : zoneval;
787 }
788 }
789
790 return max;
791}
792
793static bool zoneinfo_parse_line(char *line, union zoneinfo *zi) {
794 char *cp = line;
795 char *ap;
796 char *save_ptr;
797 int64_t val;
798 int field_idx;
799
800 cp = strtok_r(line, " ", &save_ptr);
801 if (!cp) {
802 return true;
803 }
804
805 if (!strcmp(cp, "protection:")) {
806 ap = strtok_r(NULL, ")", &save_ptr);
807 } else {
808 ap = strtok_r(NULL, " ", &save_ptr);
809 }
810
811 if (!ap) {
812 return true;
813 }
814
815 switch (match_field(cp, ap, zoneinfo_field_names,
816 ZI_FIELD_COUNT, &val, &field_idx)) {
817 case (PARSE_SUCCESS):
818 zi->arr[field_idx] += val;
819 break;
820 case (NO_MATCH):
821 if (!strcmp(cp, "protection:")) {
822 zi->field.totalreserve_pages +=
823 zoneinfo_parse_protection(ap);
824 }
825 break;
826 case (PARSE_FAIL):
827 default:
828 return false;
829 }
830 return true;
831}
832
833static int zoneinfo_parse(union zoneinfo *zi) {
834 static struct reread_data file_data = {
835 .filename = ZONEINFO_PATH,
836 .fd = -1,
837 };
838 char buf[PAGE_SIZE];
839 char *save_ptr;
840 char *line;
841
842 memset(zi, 0, sizeof(union zoneinfo));
843
844 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
845 return -1;
846 }
847
848 for (line = strtok_r(buf, "\n", &save_ptr); line;
849 line = strtok_r(NULL, "\n", &save_ptr)) {
850 if (!zoneinfo_parse_line(line, zi)) {
851 ALOGE("%s parse error", file_data.filename);
852 return -1;
853 }
854 }
855 zi->field.totalreserve_pages += zi->field.high;
856
857 return 0;
858}
859
860/* /prop/meminfo parsing routines */
861static bool meminfo_parse_line(char *line, union meminfo *mi) {
862 char *cp = line;
863 char *ap;
864 char *save_ptr;
865 int64_t val;
866 int field_idx;
867 enum field_match_result match_res;
868
869 cp = strtok_r(line, " ", &save_ptr);
870 if (!cp) {
871 return false;
872 }
873
874 ap = strtok_r(NULL, " ", &save_ptr);
875 if (!ap) {
876 return false;
877 }
878
879 match_res = match_field(cp, ap, meminfo_field_names, MI_FIELD_COUNT,
880 &val, &field_idx);
881 if (match_res == PARSE_SUCCESS) {
882 mi->arr[field_idx] = val / page_k;
883 }
884 return (match_res != PARSE_FAIL);
885}
886
887static int meminfo_parse(union meminfo *mi) {
888 static struct reread_data file_data = {
889 .filename = MEMINFO_PATH,
890 .fd = -1,
891 };
892 char buf[PAGE_SIZE];
893 char *save_ptr;
894 char *line;
895
896 memset(mi, 0, sizeof(union meminfo));
897
898 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
899 return -1;
900 }
901
902 for (line = strtok_r(buf, "\n", &save_ptr); line;
903 line = strtok_r(NULL, "\n", &save_ptr)) {
904 if (!meminfo_parse_line(line, mi)) {
905 ALOGE("%s parse error", file_data.filename);
906 return -1;
907 }
908 }
909 mi->field.nr_file_pages = mi->field.cached + mi->field.swap_cached +
910 mi->field.buffers;
911
912 return 0;
913}
914
Todd Poynor3948f802013-07-09 19:35:14 -0700915static int proc_get_size(int pid) {
916 char path[PATH_MAX];
917 char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700918 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700919 int rss = 0;
920 int total;
Colin Crossce85d952014-07-11 17:53:27 -0700921 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700922
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700923 /* gid containing AID_READPROC required */
Todd Poynor3948f802013-07-09 19:35:14 -0700924 snprintf(path, PATH_MAX, "/proc/%d/statm", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800925 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700926 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700927 return -1;
Colin Crossce85d952014-07-11 17:53:27 -0700928
929 ret = read_all(fd, line, sizeof(line) - 1);
930 if (ret < 0) {
931 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700932 return -1;
933 }
934
935 sscanf(line, "%d %d ", &total, &rss);
Colin Crossce85d952014-07-11 17:53:27 -0700936 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700937 return rss;
938}
939
940static char *proc_get_name(int pid) {
941 char path[PATH_MAX];
942 static char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700943 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700944 char *cp;
Colin Crossce85d952014-07-11 17:53:27 -0700945 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700946
Mark Salyzyn64d97d82018-04-09 09:50:32 -0700947 /* gid containing AID_READPROC required */
Todd Poynor3948f802013-07-09 19:35:14 -0700948 snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800949 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700950 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700951 return NULL;
Colin Crossce85d952014-07-11 17:53:27 -0700952 ret = read_all(fd, line, sizeof(line) - 1);
953 close(fd);
954 if (ret < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700955 return NULL;
956 }
957
958 cp = strchr(line, ' ');
959 if (cp)
960 *cp = '\0';
961
962 return line;
963}
964
965static struct proc *proc_adj_lru(int oomadj) {
966 return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]);
967}
968
Suren Baghdasaryan662492a2017-12-08 13:17:06 -0800969static struct proc *proc_get_heaviest(int oomadj) {
970 struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)];
971 struct adjslot_list *curr = head->next;
972 struct proc *maxprocp = NULL;
973 int maxsize = 0;
974 while (curr != head) {
975 int pid = ((struct proc *)curr)->pid;
976 int tasksize = proc_get_size(pid);
977 if (tasksize <= 0) {
978 struct adjslot_list *next = curr->next;
979 pid_remove(pid);
980 curr = next;
981 } else {
982 if (tasksize > maxsize) {
983 maxsize = tasksize;
984 maxprocp = (struct proc *)curr;
985 }
986 curr = curr->next;
987 }
988 }
989 return maxprocp;
990}
991
Colin Cross16b09462014-07-14 12:39:56 -0700992/* Kill one process specified by procp. Returns the size of the process killed */
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -0800993static int kill_one_process(struct proc* procp, int min_score_adj,
994 enum vmpressure_level level) {
Colin Cross16b09462014-07-14 12:39:56 -0700995 int pid = procp->pid;
996 uid_t uid = procp->uid;
997 char *taskname;
998 int tasksize;
999 int r;
1000
Rajeev Kumar70450032018-01-31 17:54:56 -08001001#ifdef LMKD_LOG_STATS
Rajeev Kumar92b659b2018-02-21 19:08:15 -08001002 struct memory_stat mem_st = {};
Rajeev Kumar70450032018-01-31 17:54:56 -08001003 int memory_stat_parse_result = -1;
1004#endif
1005
Colin Cross16b09462014-07-14 12:39:56 -07001006 taskname = proc_get_name(pid);
1007 if (!taskname) {
1008 pid_remove(pid);
1009 return -1;
1010 }
1011
1012 tasksize = proc_get_size(pid);
1013 if (tasksize <= 0) {
1014 pid_remove(pid);
1015 return -1;
1016 }
1017
Rajeev Kumar70450032018-01-31 17:54:56 -08001018#ifdef LMKD_LOG_STATS
1019 if (enable_stats_log) {
1020 memory_stat_parse_result = memory_stat_parse(&mem_st, pid, uid);
1021 }
1022#endif
1023
Suren Baghdasaryanc7135592018-01-04 10:43:58 -08001024 TRACE_KILL_START(pid);
1025
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001026 /* CAP_KILL required */
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001027 r = kill(pid, SIGKILL);
Robert Beneacaeaa652017-08-11 16:03:20 -07001028 ALOGI(
1029 "Killing '%s' (%d), uid %d, adj %d\n"
Suren Baghdasaryand07a94f2018-03-20 16:25:54 -07001030 " to free %ldkB because system is under %s memory pressure (min_oom_adj=%d)\n",
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001031 taskname, pid, uid, procp->oomadj, tasksize * page_k,
1032 level_name[level], min_score_adj);
Colin Cross16b09462014-07-14 12:39:56 -07001033 pid_remove(pid);
1034
Suren Baghdasaryanc7135592018-01-04 10:43:58 -08001035 TRACE_KILL_END();
1036
Colin Cross16b09462014-07-14 12:39:56 -07001037 if (r) {
Mark Salyzyn919f5382018-02-04 15:27:23 -08001038 ALOGE("kill(%d): errno=%d", pid, errno);
Colin Cross16b09462014-07-14 12:39:56 -07001039 return -1;
Rajeev Kumar70450032018-01-31 17:54:56 -08001040 } else {
1041#ifdef LMKD_LOG_STATS
1042 if (memory_stat_parse_result == 0) {
1043 stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname,
1044 procp->oomadj, mem_st.pgfault, mem_st.pgmajfault, mem_st.rss_in_bytes,
1045 mem_st.cache_in_bytes, mem_st.swap_in_bytes);
1046 }
1047#endif
1048 return tasksize;
Colin Cross16b09462014-07-14 12:39:56 -07001049 }
Mark Salyzyn919f5382018-02-04 15:27:23 -08001050
1051 return tasksize;
Colin Cross16b09462014-07-14 12:39:56 -07001052}
1053
1054/*
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001055 * Find processes to kill to free required number of pages.
1056 * If pages_to_free is set to 0 only one process will be killed.
1057 * Returns the size of the killed processes.
Colin Cross16b09462014-07-14 12:39:56 -07001058 */
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001059static int find_and_kill_processes(enum vmpressure_level level,
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001060 int min_score_adj, int pages_to_free) {
Colin Cross16b09462014-07-14 12:39:56 -07001061 int i;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001062 int killed_size;
1063 int pages_freed = 0;
Colin Cross16b09462014-07-14 12:39:56 -07001064
Rajeev Kumar70450032018-01-31 17:54:56 -08001065#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001066 bool lmk_state_change_start = false;
Rajeev Kumar70450032018-01-31 17:54:56 -08001067#endif
1068
Chong Zhang0a4acdf2015-10-14 16:19:53 -07001069 for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
Colin Cross16b09462014-07-14 12:39:56 -07001070 struct proc *procp;
1071
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001072 while (true) {
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -07001073 procp = kill_heaviest_task ?
1074 proc_get_heaviest(i) : proc_adj_lru(i);
Colin Cross16b09462014-07-14 12:39:56 -07001075
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001076 if (!procp)
1077 break;
1078
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001079 killed_size = kill_one_process(procp, min_score_adj, level);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001080 if (killed_size >= 0) {
Yang Lu5564f4e2018-05-15 04:59:44 +00001081#ifdef LMKD_LOG_STATS
1082 if (enable_stats_log && !lmk_state_change_start) {
1083 lmk_state_change_start = true;
1084 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED,
1085 LMK_STATE_CHANGE_START);
1086 }
1087#endif
1088
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001089 pages_freed += killed_size;
1090 if (pages_freed >= pages_to_free) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001091
1092#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001093 if (enable_stats_log && lmk_state_change_start) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001094 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED,
1095 LMK_STATE_CHANGE_STOP);
1096 }
1097#endif
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001098 return pages_freed;
1099 }
Colin Cross16b09462014-07-14 12:39:56 -07001100 }
1101 }
1102 }
1103
Rajeev Kumar70450032018-01-31 17:54:56 -08001104#ifdef LMKD_LOG_STATS
Yang Lu5564f4e2018-05-15 04:59:44 +00001105 if (enable_stats_log && lmk_state_change_start) {
Rajeev Kumar70450032018-01-31 17:54:56 -08001106 stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, LMK_STATE_CHANGE_STOP);
1107 }
1108#endif
1109
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001110 return pages_freed;
Colin Cross16b09462014-07-14 12:39:56 -07001111}
1112
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001113static int64_t get_memory_usage(struct reread_data *file_data) {
Robert Beneac47f2992017-08-21 15:18:31 -07001114 int ret;
1115 int64_t mem_usage;
1116 char buf[32];
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001117
1118 if (reread_file(file_data, buf, sizeof(buf)) < 0) {
Robert Beneac47f2992017-08-21 15:18:31 -07001119 return -1;
1120 }
1121
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001122 if (!parse_int64(buf, &mem_usage)) {
1123 ALOGE("%s parse error", file_data->filename);
Robert Beneac47f2992017-08-21 15:18:31 -07001124 return -1;
1125 }
Robert Beneac47f2992017-08-21 15:18:31 -07001126 if (mem_usage == 0) {
1127 ALOGE("No memory!");
1128 return -1;
1129 }
1130 return mem_usage;
1131}
1132
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001133void record_low_pressure_levels(union meminfo *mi) {
1134 if (low_pressure_mem.min_nr_free_pages == -1 ||
1135 low_pressure_mem.min_nr_free_pages > mi->field.nr_free_pages) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001136 if (debug_process_killing) {
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001137 ALOGI("Low pressure min memory update from %" PRId64 " to %" PRId64,
1138 low_pressure_mem.min_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001139 }
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001140 low_pressure_mem.min_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001141 }
1142 /*
1143 * Free memory at low vmpressure events occasionally gets spikes,
1144 * possibly a stale low vmpressure event with memory already
1145 * freed up (no memory pressure should have been reported).
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001146 * Ignore large jumps in max_nr_free_pages that would mess up our stats.
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001147 */
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001148 if (low_pressure_mem.max_nr_free_pages == -1 ||
1149 (low_pressure_mem.max_nr_free_pages < mi->field.nr_free_pages &&
1150 mi->field.nr_free_pages - low_pressure_mem.max_nr_free_pages <
1151 low_pressure_mem.max_nr_free_pages * 0.1)) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001152 if (debug_process_killing) {
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001153 ALOGI("Low pressure max memory update from %" PRId64 " to %" PRId64,
1154 low_pressure_mem.max_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001155 }
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001156 low_pressure_mem.max_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001157 }
1158}
1159
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001160enum vmpressure_level upgrade_level(enum vmpressure_level level) {
1161 return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ?
1162 level + 1 : level);
1163}
1164
1165enum vmpressure_level downgrade_level(enum vmpressure_level level) {
1166 return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ?
1167 level - 1 : level);
1168}
1169
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001170static inline unsigned long get_time_diff_ms(struct timeval *from,
1171 struct timeval *to) {
1172 return (to->tv_sec - from->tv_sec) * 1000 +
1173 (to->tv_usec - from->tv_usec) / 1000;
1174}
1175
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001176static void mp_event_common(int data, uint32_t events __unused) {
Todd Poynor3948f802013-07-09 19:35:14 -07001177 int ret;
1178 unsigned long long evcount;
Robert Beneac47f2992017-08-21 15:18:31 -07001179 int64_t mem_usage, memsw_usage;
Robert Benea6e8e7102017-09-13 15:20:30 -07001180 int64_t mem_pressure;
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001181 enum vmpressure_level lvl;
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001182 union meminfo mi;
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001183 union zoneinfo zi;
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001184 static struct timeval last_report_tm;
1185 static unsigned long skip_count = 0;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001186 enum vmpressure_level level = (enum vmpressure_level)data;
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001187 long other_free = 0, other_file = 0;
1188 int min_score_adj;
1189 int pages_to_free = 0;
1190 int minfree = 0;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001191 static struct reread_data mem_usage_file_data = {
1192 .filename = MEMCG_MEMORY_USAGE,
1193 .fd = -1,
1194 };
1195 static struct reread_data memsw_usage_file_data = {
1196 .filename = MEMCG_MEMORYSW_USAGE,
1197 .fd = -1,
1198 };
Todd Poynor3948f802013-07-09 19:35:14 -07001199
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001200 /*
1201 * Check all event counters from low to critical
1202 * and upgrade to the highest priority one. By reading
1203 * eventfd we also reset the event counters.
1204 */
1205 for (lvl = VMPRESS_LEVEL_LOW; lvl < VMPRESS_LEVEL_COUNT; lvl++) {
1206 if (mpevfd[lvl] != -1 &&
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001207 TEMP_FAILURE_RETRY(read(mpevfd[lvl],
1208 &evcount, sizeof(evcount))) > 0 &&
Suren Baghdasaryane82e15c2018-01-04 09:16:21 -08001209 evcount > 0 && lvl > level) {
1210 level = lvl;
1211 }
1212 }
Todd Poynor3948f802013-07-09 19:35:14 -07001213
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001214 if (kill_timeout_ms) {
1215 struct timeval curr_tm;
1216 gettimeofday(&curr_tm, NULL);
1217 if (get_time_diff_ms(&last_report_tm, &curr_tm) < kill_timeout_ms) {
1218 skip_count++;
1219 return;
1220 }
1221 }
1222
1223 if (skip_count > 0) {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001224 ALOGI("%lu memory pressure events were skipped after a kill!",
1225 skip_count);
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001226 skip_count = 0;
1227 }
1228
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001229 if (meminfo_parse(&mi) < 0 || zoneinfo_parse(&zi) < 0) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001230 ALOGE("Failed to get free memory!");
1231 return;
1232 }
1233
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001234 if (use_minfree_levels) {
1235 int i;
1236
1237 other_free = mi.field.nr_free_pages - zi.field.totalreserve_pages;
1238 if (mi.field.nr_file_pages > (mi.field.shmem + mi.field.unevictable + mi.field.swap_cached)) {
1239 other_file = (mi.field.nr_file_pages - mi.field.shmem -
1240 mi.field.unevictable - mi.field.swap_cached);
1241 } else {
1242 other_file = 0;
1243 }
1244
1245 min_score_adj = OOM_SCORE_ADJ_MAX + 1;
1246 for (i = 0; i < lowmem_targets_size; i++) {
1247 minfree = lowmem_minfree[i];
1248 if (other_free < minfree && other_file < minfree) {
1249 min_score_adj = lowmem_adj[i];
1250 break;
1251 }
1252 }
1253
Suren Baghdasaryan20686f02018-05-18 14:42:00 -07001254 if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
1255 if (debug_process_killing) {
1256 ALOGI("Ignore %s memory pressure event "
1257 "(free memory=%ldkB, cache=%ldkB, limit=%ldkB)",
1258 level_name[level], other_free * page_k, other_file * page_k,
1259 (long)lowmem_minfree[lowmem_targets_size - 1] * page_k);
1260 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001261 return;
Suren Baghdasaryan20686f02018-05-18 14:42:00 -07001262 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001263
1264 /* Free up enough pages to push over the highest minfree level */
1265 pages_to_free = lowmem_minfree[lowmem_targets_size - 1] -
1266 ((other_free < other_file) ? other_free : other_file);
1267 goto do_kill;
1268 }
1269
Suren Baghdasaryan9926e572018-04-13 13:41:12 -07001270 if (level == VMPRESS_LEVEL_LOW) {
1271 record_low_pressure_levels(&mi);
1272 }
1273
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001274 if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) {
1275 /* Do not monitor this pressure level */
1276 return;
1277 }
1278
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001279 if ((mem_usage = get_memory_usage(&mem_usage_file_data)) < 0) {
1280 goto do_kill;
1281 }
1282 if ((memsw_usage = get_memory_usage(&memsw_usage_file_data)) < 0) {
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001283 goto do_kill;
Robert Benea6e8e7102017-09-13 15:20:30 -07001284 }
Robert Beneac47f2992017-08-21 15:18:31 -07001285
Robert Benea6e8e7102017-09-13 15:20:30 -07001286 // Calculate percent for swappinness.
1287 mem_pressure = (mem_usage * 100) / memsw_usage;
1288
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001289 if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) {
Robert Benea6e8e7102017-09-13 15:20:30 -07001290 // We are swapping too much.
1291 if (mem_pressure < upgrade_pressure) {
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001292 level = upgrade_level(level);
1293 if (debug_process_killing) {
1294 ALOGI("Event upgraded to %s", level_name[level]);
1295 }
Robert Beneac47f2992017-08-21 15:18:31 -07001296 }
1297 }
1298
Robert Benea6e8e7102017-09-13 15:20:30 -07001299 // If the pressure is larger than downgrade_pressure lmk will not
1300 // kill any process, since enough memory is available.
1301 if (mem_pressure > downgrade_pressure) {
1302 if (debug_process_killing) {
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001303 ALOGI("Ignore %s memory pressure", level_name[level]);
Robert Benea6e8e7102017-09-13 15:20:30 -07001304 }
1305 return;
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001306 } else if (level == VMPRESS_LEVEL_CRITICAL &&
1307 mem_pressure > upgrade_pressure) {
Robert Benea6e8e7102017-09-13 15:20:30 -07001308 if (debug_process_killing) {
1309 ALOGI("Downgrade critical memory pressure");
1310 }
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001311 // Downgrade event, since enough memory available.
1312 level = downgrade_level(level);
Robert Benea6e8e7102017-09-13 15:20:30 -07001313 }
1314
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001315do_kill:
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001316 if (low_ram_device) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001317 /* For Go devices kill only one task */
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001318 if (find_and_kill_processes(level, level_oomadj[level], 0) == 0) {
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001319 if (debug_process_killing) {
1320 ALOGI("Nothing to kill");
1321 }
1322 }
1323 } else {
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001324 int pages_freed;
1325
1326 if (!use_minfree_levels) {
1327 /* If pressure level is less than critical and enough free swap then ignore */
1328 if (level < VMPRESS_LEVEL_CRITICAL &&
1329 mi.field.free_swap > low_pressure_mem.max_nr_free_pages) {
1330 if (debug_process_killing) {
1331 ALOGI("Ignoring pressure since %" PRId64
1332 " swap pages are available ",
1333 mi.field.free_swap);
1334 }
1335 return;
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001336 }
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001337 /* Free up enough memory to downgrate the memory pressure to low level */
1338 if (mi.field.nr_free_pages < low_pressure_mem.max_nr_free_pages) {
1339 pages_to_free = low_pressure_mem.max_nr_free_pages -
1340 mi.field.nr_free_pages;
1341 } else {
1342 if (debug_process_killing) {
1343 ALOGI("Ignoring pressure since more memory is "
1344 "available (%" PRId64 ") than watermark (%" PRId64 ")",
1345 mi.field.nr_free_pages, low_pressure_mem.max_nr_free_pages);
1346 }
1347 return;
1348 }
1349 min_score_adj = level_oomadj[level];
Suren Baghdasaryan65f54a22018-01-17 17:17:44 -08001350 }
1351
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001352 pages_freed = find_and_kill_processes(level, min_score_adj, pages_to_free);
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001353
1354 if (use_minfree_levels) {
1355 ALOGI("Killing because cache %ldkB is below "
1356 "limit %ldkB for oom_adj %d\n"
1357 " Free memory is %ldkB %s reserved",
1358 other_file * page_k, minfree * page_k, min_score_adj,
1359 other_free * page_k, other_free >= 0 ? "above" : "below");
1360 }
1361
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001362 if (pages_freed < pages_to_free) {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001363 ALOGI("Unable to free enough memory (pages to free=%d, pages freed=%d)",
1364 pages_to_free, pages_freed);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001365 } else {
Suren Baghdasaryanda88b242018-05-10 16:10:56 -07001366 ALOGI("Reclaimed enough memory (pages to free=%d, pages freed=%d)",
1367 pages_to_free, pages_freed);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001368 gettimeofday(&last_report_tm, NULL);
Robert Beneacaeaa652017-08-11 16:03:20 -07001369 }
Colin Crossf8857cc2014-07-11 17:16:56 -07001370 }
Todd Poynor3948f802013-07-09 19:35:14 -07001371}
1372
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001373static bool init_mp_common(enum vmpressure_level level) {
Todd Poynor3948f802013-07-09 19:35:14 -07001374 int mpfd;
1375 int evfd;
1376 int evctlfd;
1377 char buf[256];
1378 struct epoll_event epev;
1379 int ret;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001380 int level_idx = (int)level;
1381 const char *levelstr = level_name[level_idx];
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001382
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001383 /* gid containing AID_SYSTEM required */
Nick Kralevichc68c8862015-12-18 20:52:37 -08001384 mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001385 if (mpfd < 0) {
1386 ALOGI("No kernel memory.pressure_level support (errno=%d)", errno);
1387 goto err_open_mpfd;
1388 }
1389
Nick Kralevichc68c8862015-12-18 20:52:37 -08001390 evctlfd = open(MEMCG_SYSFS_PATH "cgroup.event_control", O_WRONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001391 if (evctlfd < 0) {
1392 ALOGI("No kernel memory cgroup event control (errno=%d)", errno);
1393 goto err_open_evctlfd;
1394 }
1395
Nick Kralevichc68c8862015-12-18 20:52:37 -08001396 evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001397 if (evfd < 0) {
1398 ALOGE("eventfd failed for level %s; errno=%d", levelstr, errno);
1399 goto err_eventfd;
1400 }
1401
1402 ret = snprintf(buf, sizeof(buf), "%d %d %s", evfd, mpfd, levelstr);
1403 if (ret >= (ssize_t)sizeof(buf)) {
1404 ALOGE("cgroup.event_control line overflow for level %s", levelstr);
1405 goto err;
1406 }
1407
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001408 ret = TEMP_FAILURE_RETRY(write(evctlfd, buf, strlen(buf) + 1));
Todd Poynor3948f802013-07-09 19:35:14 -07001409 if (ret == -1) {
1410 ALOGE("cgroup.event_control write failed for level %s; errno=%d",
1411 levelstr, errno);
1412 goto err;
1413 }
1414
1415 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001416 /* use data to store event level */
1417 vmpressure_hinfo[level_idx].data = level_idx;
1418 vmpressure_hinfo[level_idx].handler = mp_event_common;
1419 epev.data.ptr = (void *)&vmpressure_hinfo[level_idx];
Todd Poynor3948f802013-07-09 19:35:14 -07001420 ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, evfd, &epev);
1421 if (ret == -1) {
1422 ALOGE("epoll_ctl for level %s failed; errno=%d", levelstr, errno);
1423 goto err;
1424 }
1425 maxevents++;
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001426 mpevfd[level] = evfd;
Suren Baghdasaryan1bd2fc42018-01-04 08:54:53 -08001427 close(evctlfd);
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001428 return true;
Todd Poynor3948f802013-07-09 19:35:14 -07001429
1430err:
1431 close(evfd);
1432err_eventfd:
1433 close(evctlfd);
1434err_open_evctlfd:
1435 close(mpfd);
1436err_open_mpfd:
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001437 return false;
Robert Benea673e2762017-06-01 16:32:31 -07001438}
1439
Todd Poynor3948f802013-07-09 19:35:14 -07001440static int init(void) {
1441 struct epoll_event epev;
1442 int i;
1443 int ret;
1444
1445 page_k = sysconf(_SC_PAGESIZE);
1446 if (page_k == -1)
1447 page_k = PAGE_SIZE;
1448 page_k /= 1024;
1449
1450 epollfd = epoll_create(MAX_EPOLL_EVENTS);
1451 if (epollfd == -1) {
1452 ALOGE("epoll_create failed (errno=%d)", errno);
1453 return -1;
1454 }
1455
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001456 // mark data connections as not connected
1457 for (int i = 0; i < MAX_DATA_CONN; i++) {
1458 data_sock[i].sock = -1;
1459 }
1460
1461 ctrl_sock.sock = android_get_control_socket("lmkd");
1462 if (ctrl_sock.sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -07001463 ALOGE("get lmkd control socket failed");
1464 return -1;
1465 }
1466
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001467 ret = listen(ctrl_sock.sock, MAX_DATA_CONN);
Todd Poynor3948f802013-07-09 19:35:14 -07001468 if (ret < 0) {
1469 ALOGE("lmkd control socket listen failed (errno=%d)", errno);
1470 return -1;
1471 }
1472
1473 epev.events = EPOLLIN;
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001474 ctrl_sock.handler_info.handler = ctrl_connect_handler;
1475 epev.data.ptr = (void *)&(ctrl_sock.handler_info);
1476 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_sock.sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -07001477 ALOGE("epoll_ctl for lmkd control socket failed (errno=%d)", errno);
1478 return -1;
1479 }
1480 maxevents++;
1481
Robert Benea164baeb2017-09-11 16:53:28 -07001482 has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK);
Suren Baghdasaryan979591b2018-01-18 17:27:30 -08001483 use_inkernel_interface = has_inkernel_module;
Todd Poynor3948f802013-07-09 19:35:14 -07001484
1485 if (use_inkernel_interface) {
1486 ALOGI("Using in-kernel low memory killer interface");
1487 } else {
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001488 if (!init_mp_common(VMPRESS_LEVEL_LOW) ||
1489 !init_mp_common(VMPRESS_LEVEL_MEDIUM) ||
1490 !init_mp_common(VMPRESS_LEVEL_CRITICAL)) {
Todd Poynor3948f802013-07-09 19:35:14 -07001491 ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001492 return -1;
1493 }
Todd Poynor3948f802013-07-09 19:35:14 -07001494 }
1495
Chong Zhang0a4acdf2015-10-14 16:19:53 -07001496 for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
Todd Poynor3948f802013-07-09 19:35:14 -07001497 procadjslot_list[i].next = &procadjslot_list[i];
1498 procadjslot_list[i].prev = &procadjslot_list[i];
1499 }
1500
1501 return 0;
1502}
1503
1504static void mainloop(void) {
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001505 struct event_handler_info* handler_info;
1506 struct epoll_event *evt;
1507
Todd Poynor3948f802013-07-09 19:35:14 -07001508 while (1) {
1509 struct epoll_event events[maxevents];
1510 int nevents;
1511 int i;
1512
Todd Poynor3948f802013-07-09 19:35:14 -07001513 nevents = epoll_wait(epollfd, events, maxevents, -1);
1514
1515 if (nevents == -1) {
1516 if (errno == EINTR)
1517 continue;
1518 ALOGE("epoll_wait failed (errno=%d)", errno);
1519 continue;
1520 }
1521
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001522 /*
1523 * First pass to see if any data socket connections were dropped.
1524 * Dropped connection should be handled before any other events
1525 * to deallocate data connection and correctly handle cases when
1526 * connection gets dropped and reestablished in the same epoll cycle.
1527 * In such cases it's essential to handle connection closures first.
1528 */
1529 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1530 if ((evt->events & EPOLLHUP) && evt->data.ptr) {
1531 ALOGI("lmkd data connection dropped");
1532 handler_info = (struct event_handler_info*)evt->data.ptr;
1533 ctrl_data_close(handler_info->data);
1534 }
1535 }
1536
1537 /* Second pass to handle all other events */
1538 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1539 if (evt->events & EPOLLERR)
Todd Poynor3948f802013-07-09 19:35:14 -07001540 ALOGD("EPOLLERR on event #%d", i);
Suren Baghdasaryan3cfb2c82018-01-26 12:51:19 -08001541 if (evt->events & EPOLLHUP) {
1542 /* This case was handled in the first pass */
1543 continue;
1544 }
1545 if (evt->data.ptr) {
1546 handler_info = (struct event_handler_info*)evt->data.ptr;
1547 handler_info->handler(handler_info->data, evt->events);
1548 }
Todd Poynor3948f802013-07-09 19:35:14 -07001549 }
1550 }
1551}
1552
Mark Salyzyne6ed68b2014-04-30 13:36:35 -07001553int main(int argc __unused, char **argv __unused) {
Colin Cross1a0d9be2014-07-14 14:31:15 -07001554 struct sched_param param = {
1555 .sched_priority = 1,
1556 };
1557
Suren Baghdasaryan96bf3a62017-12-08 12:58:52 -08001558 /* By default disable low level vmpressure events */
1559 level_oomadj[VMPRESS_LEVEL_LOW] =
1560 property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1);
1561 level_oomadj[VMPRESS_LEVEL_MEDIUM] =
1562 property_get_int32("ro.lmk.medium", 800);
1563 level_oomadj[VMPRESS_LEVEL_CRITICAL] =
1564 property_get_int32("ro.lmk.critical", 0);
Robert Beneacaeaa652017-08-11 16:03:20 -07001565 debug_process_killing = property_get_bool("ro.lmk.debug", false);
Suren Baghdasaryanad2fd912017-12-08 13:08:41 -08001566
1567 /* By default disable upgrade/downgrade logic */
1568 enable_pressure_upgrade =
1569 property_get_bool("ro.lmk.critical_upgrade", false);
1570 upgrade_pressure =
1571 (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100);
1572 downgrade_pressure =
1573 (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100);
Suren Baghdasaryan662492a2017-12-08 13:17:06 -08001574 kill_heaviest_task =
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -07001575 property_get_bool("ro.lmk.kill_heaviest_task", false);
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001576 low_ram_device = property_get_bool("ro.config.low_ram", false);
Suren Baghdasaryancaa2dc52018-01-17 17:28:01 -08001577 kill_timeout_ms =
1578 (unsigned long)property_get_int32("ro.lmk.kill_timeout_ms", 0);
Suren Baghdasaryanffdc4dd2018-04-13 13:53:43 -07001579 use_minfree_levels =
1580 property_get_bool("ro.lmk.use_minfree_levels", false);
Suren Baghdasaryance13cb52018-06-19 18:38:12 -07001581 per_app_memcg =
1582 property_get_bool("ro.config.per_app_memcg", low_ram_device);
Robert Benea58891d52017-07-31 17:15:20 -07001583
Rajeev Kumar70450032018-01-31 17:54:56 -08001584#ifdef LMKD_LOG_STATS
Rajeev Kumar1c669f72018-03-09 15:20:56 -08001585 statslog_init(&log_ctx, &enable_stats_log);
Rajeev Kumar70450032018-01-31 17:54:56 -08001586#endif
1587
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001588 if (!init()) {
1589 if (!use_inkernel_interface) {
1590 /*
1591 * MCL_ONFAULT pins pages as they fault instead of loading
1592 * everything immediately all at once. (Which would be bad,
1593 * because as of this writing, we have a lot of mapped pages we
1594 * never use.) Old kernels will see MCL_ONFAULT and fail with
1595 * EINVAL; we ignore this failure.
1596 *
1597 * N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT
1598 * pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault
1599 * in pages.
1600 */
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001601 /* CAP_IPC_LOCK required */
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001602 if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && (errno != EINVAL)) {
1603 ALOGW("mlockall failed %s", strerror(errno));
1604 }
Daniel Colascione4dd5d002018-01-03 12:01:02 -08001605
Mark Salyzyn64d97d82018-04-09 09:50:32 -07001606 /* CAP_NICE required */
1607 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1608 ALOGW("set SCHED_FIFO failed %s", strerror(errno));
1609 }
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001610 }
1611
Todd Poynor3948f802013-07-09 19:35:14 -07001612 mainloop();
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001613 }
Todd Poynor3948f802013-07-09 19:35:14 -07001614
Rajeev Kumar70450032018-01-31 17:54:56 -08001615#ifdef LMKD_LOG_STATS
Rajeev Kumar1c669f72018-03-09 15:20:56 -08001616 statslog_destroy(&log_ctx);
Rajeev Kumar70450032018-01-31 17:54:56 -08001617#endif
1618
Todd Poynor3948f802013-07-09 19:35:14 -07001619 ALOGI("exiting");
1620 return 0;
1621}