blob: 5eb3fbe158a0429d0e404c16d494297d24f02c55 [file] [log] [blame]
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 Baghdasaryanaa73baf2018-01-17 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 Baghdasaryana92de712018-03-07 12:27:50 -080038#include <lmkd.h>
Mark Salyzyn30f991f2017-01-10 13:19:54 -080039#include <log/log.h>
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070040
Suren Baghdasaryane1217c02018-01-04 10:43:58 -080041/*
42 * Define LMKD_TRACE_KILLS to record lmkd kills in kernel traces
43 * to profile and correlate with OOM kills
44 */
45#ifdef LMKD_TRACE_KILLS
46
47#define ATRACE_TAG ATRACE_TAG_ALWAYS
48#include <cutils/trace.h>
49
50#define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid);
51#define TRACE_KILL_END() ATRACE_INT(__FUNCTION__, 0);
52
53#else /* LMKD_TRACE_KILLS */
54
55#define TRACE_KILL_START(pid)
56#define TRACE_KILL_END()
57
58#endif /* LMKD_TRACE_KILLS */
59
Mark Salyzyne6ed68b2014-04-30 13:36:35 -070060#ifndef __unused
61#define __unused __attribute__((__unused__))
62#endif
Todd Poynor3948f802013-07-09 19:35:14 -070063
64#define MEMCG_SYSFS_PATH "/dev/memcg/"
Robert Beneac47f2992017-08-21 15:18:31 -070065#define MEMCG_MEMORY_USAGE "/dev/memcg/memory.usage_in_bytes"
66#define MEMCG_MEMORYSW_USAGE "/dev/memcg/memory.memsw.usage_in_bytes"
Todd Poynor3948f802013-07-09 19:35:14 -070067#define ZONEINFO_PATH "/proc/zoneinfo"
Suren Baghdasaryanceffb412018-04-13 13:11:51 -070068#define MEMINFO_PATH "/proc/meminfo"
Todd Poynor3948f802013-07-09 19:35:14 -070069#define LINE_MAX 128
70
71#define INKERNEL_MINFREE_PATH "/sys/module/lowmemorykiller/parameters/minfree"
72#define INKERNEL_ADJ_PATH "/sys/module/lowmemorykiller/parameters/adj"
73
74#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
Robert Benea673e2762017-06-01 16:32:31 -070075#define EIGHT_MEGA (1 << 23)
Todd Poynor3948f802013-07-09 19:35:14 -070076
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -070077/* Defined as ProcessList.SYSTEM_ADJ in ProcessList.java */
78#define SYSTEM_ADJ (-900)
79
Todd Poynor3948f802013-07-09 19:35:14 -070080/* default to old in-kernel interface if no memory pressure events */
Mark Salyzyn721d7c72018-03-21 12:24:58 -070081static bool use_inkernel_interface = true;
Robert Benea164baeb2017-09-11 16:53:28 -070082static bool has_inkernel_module;
Todd Poynor3948f802013-07-09 19:35:14 -070083
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -080084/* memory pressure levels */
85enum vmpressure_level {
86 VMPRESS_LEVEL_LOW = 0,
87 VMPRESS_LEVEL_MEDIUM,
88 VMPRESS_LEVEL_CRITICAL,
89 VMPRESS_LEVEL_COUNT
90};
Todd Poynor3948f802013-07-09 19:35:14 -070091
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -080092static const char *level_name[] = {
93 "low",
94 "medium",
95 "critical"
96};
97
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -080098struct {
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -070099 int64_t min_nr_free_pages; /* recorded but not used yet */
100 int64_t max_nr_free_pages;
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800101} low_pressure_mem = { -1, -1 };
102
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800103static int level_oomadj[VMPRESS_LEVEL_COUNT];
Suren Baghdasaryan1a2589e2018-01-04 09:16:21 -0800104static int mpevfd[VMPRESS_LEVEL_COUNT] = { -1, -1, -1 };
Robert Beneac47f2992017-08-21 15:18:31 -0700105static bool debug_process_killing;
106static bool enable_pressure_upgrade;
107static int64_t upgrade_pressure;
Robert Benea6e8e7102017-09-13 15:20:30 -0700108static int64_t downgrade_pressure;
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -0700109static bool low_ram_device;
Suren Baghdasaryanb93764d2017-12-08 13:17:06 -0800110static bool kill_heaviest_task;
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -0800111static unsigned long kill_timeout_ms;
Robert Benea58891d52017-07-31 17:15:20 -0700112
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800113/* data required to handle events */
114struct event_handler_info {
115 int data;
116 void (*handler)(int data, uint32_t events);
117};
Todd Poynor3948f802013-07-09 19:35:14 -0700118
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800119/* data required to handle socket events */
120struct sock_event_handler_info {
121 int sock;
122 struct event_handler_info handler_info;
123};
124
125/* max supported number of data connections */
126#define MAX_DATA_CONN 2
127
128/* socket event handler data */
129static struct sock_event_handler_info ctrl_sock;
130static struct sock_event_handler_info data_sock[MAX_DATA_CONN];
131
132/* vmpressure event handler data */
133static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT];
134
135/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */
136#define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
Todd Poynor3948f802013-07-09 19:35:14 -0700137static int epollfd;
138static int maxevents;
139
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700140/* OOM score values used by both kernel and framework */
Todd Poynor16b60992013-09-16 19:26:47 -0700141#define OOM_SCORE_ADJ_MIN (-1000)
142#define OOM_SCORE_ADJ_MAX 1000
143
Todd Poynor3948f802013-07-09 19:35:14 -0700144static int lowmem_adj[MAX_TARGETS];
145static int lowmem_minfree[MAX_TARGETS];
146static int lowmem_targets_size;
147
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700148/* Fields to parse in /proc/zoneinfo */
149enum zoneinfo_field {
150 ZI_NR_FREE_PAGES = 0,
151 ZI_NR_FILE_PAGES,
152 ZI_NR_SHMEM,
153 ZI_NR_UNEVICTABLE,
154 ZI_WORKINGSET_REFAULT,
155 ZI_HIGH,
156 ZI_FIELD_COUNT
157};
158
159static const char* const zoneinfo_field_names[ZI_FIELD_COUNT] = {
160 "nr_free_pages",
161 "nr_file_pages",
162 "nr_shmem",
163 "nr_unevictable",
164 "workingset_refault",
165 "high",
166};
167
168union zoneinfo {
169 struct {
170 int64_t nr_free_pages;
171 int64_t nr_file_pages;
172 int64_t nr_shmem;
173 int64_t nr_unevictable;
174 int64_t workingset_refault;
175 int64_t high;
176 /* fields below are calculated rather than read from the file */
177 int64_t totalreserve_pages;
178 } field;
179 int64_t arr[ZI_FIELD_COUNT];
180};
181
182/* Fields to parse in /proc/meminfo */
183enum meminfo_field {
184 MI_NR_FREE_PAGES = 0,
185 MI_CACHED,
186 MI_SWAP_CACHED,
187 MI_BUFFERS,
188 MI_SHMEM,
189 MI_UNEVICTABLE,
190 MI_FREE_SWAP,
191 MI_DIRTY,
192 MI_FIELD_COUNT
193};
194
195static const char* const meminfo_field_names[MI_FIELD_COUNT] = {
196 "MemFree:",
197 "Cached:",
198 "SwapCached:",
199 "Buffers:",
200 "Shmem:",
201 "Unevictable:",
202 "SwapFree:",
203 "Dirty:",
204};
205
206union meminfo {
207 struct {
208 int64_t nr_free_pages;
209 int64_t cached;
210 int64_t swap_cached;
211 int64_t buffers;
212 int64_t shmem;
213 int64_t unevictable;
214 int64_t free_swap;
215 int64_t dirty;
216 /* fields below are calculated rather than read from the file */
217 int64_t nr_file_pages;
218 } field;
219 int64_t arr[MI_FIELD_COUNT];
220};
221
222enum field_match_result {
223 NO_MATCH,
224 PARSE_FAIL,
225 PARSE_SUCCESS
226};
227
Todd Poynor3948f802013-07-09 19:35:14 -0700228struct adjslot_list {
229 struct adjslot_list *next;
230 struct adjslot_list *prev;
231};
232
233struct proc {
234 struct adjslot_list asl;
235 int pid;
Colin Crossfbb78c62014-06-13 14:52:43 -0700236 uid_t uid;
Todd Poynor3948f802013-07-09 19:35:14 -0700237 int oomadj;
238 struct proc *pidhash_next;
239};
240
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700241struct reread_data {
242 const char* const filename;
243 int fd;
244};
245
Todd Poynor3948f802013-07-09 19:35:14 -0700246#define PIDHASH_SZ 1024
247static struct proc *pidhash[PIDHASH_SZ];
248#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
249
Chih-Hung Hsiehdaa13ea2016-05-19 16:02:22 -0700250#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN)
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700251static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1];
Todd Poynor3948f802013-07-09 19:35:14 -0700252
Todd Poynor3948f802013-07-09 19:35:14 -0700253/* PAGE_SIZE / 1024 */
254static long page_k;
255
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700256static bool parse_int64(const char* str, int64_t* ret) {
257 char* endptr;
258 long long val = strtoll(str, &endptr, 10);
259 if (str == endptr || val > INT64_MAX) {
260 return false;
261 }
262 *ret = (int64_t)val;
263 return true;
264}
265
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700266static enum field_match_result match_field(const char* cp, const char* ap,
267 const char* const field_names[],
268 int field_count, int64_t* field,
269 int *field_idx) {
270 int64_t val;
271 int i;
272
273 for (i = 0; i < field_count; i++) {
274 if (!strcmp(cp, field_names[i])) {
275 *field_idx = i;
276 return parse_int64(ap, field) ? PARSE_SUCCESS : PARSE_FAIL;
277 }
278 }
279 return NO_MATCH;
280}
281
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700282/*
283 * Read file content from the beginning up to max_len bytes or EOF
284 * whichever happens first.
285 */
Colin Crossce85d952014-07-11 17:53:27 -0700286static ssize_t read_all(int fd, char *buf, size_t max_len)
287{
288 ssize_t ret = 0;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700289 off_t offset = 0;
Colin Crossce85d952014-07-11 17:53:27 -0700290
291 while (max_len > 0) {
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700292 ssize_t r = TEMP_FAILURE_RETRY(pread(fd, buf, max_len, offset));
Colin Crossce85d952014-07-11 17:53:27 -0700293 if (r == 0) {
294 break;
295 }
296 if (r == -1) {
297 return -1;
298 }
299 ret += r;
300 buf += r;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700301 offset += r;
Colin Crossce85d952014-07-11 17:53:27 -0700302 max_len -= r;
303 }
304
305 return ret;
306}
307
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700308/*
309 * Read a new or already opened file from the beginning.
310 * If the file has not been opened yet data->fd should be set to -1.
311 * To be used with files which are read often and possibly during high
312 * memory pressure to minimize file opening which by itself requires kernel
313 * memory allocation and might result in a stall on memory stressed system.
314 */
315static int reread_file(struct reread_data *data, char *buf, size_t buf_size) {
316 ssize_t size;
317
318 if (data->fd == -1) {
319 data->fd = open(data->filename, O_RDONLY | O_CLOEXEC);
320 if (data->fd == -1) {
321 ALOGE("%s open: %s", data->filename, strerror(errno));
322 return -1;
323 }
324 }
325
326 size = read_all(data->fd, buf, buf_size - 1);
327 if (size < 0) {
328 ALOGE("%s read: %s", data->filename, strerror(errno));
329 close(data->fd);
330 data->fd = -1;
331 return -1;
332 }
333 ALOG_ASSERT((size_t)size < buf_size - 1, data->filename " too large");
334 buf[size] = 0;
335
336 return 0;
337}
338
Todd Poynor3948f802013-07-09 19:35:14 -0700339static struct proc *pid_lookup(int pid) {
340 struct proc *procp;
341
342 for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid;
343 procp = procp->pidhash_next)
344 ;
345
346 return procp;
347}
348
349static void adjslot_insert(struct adjslot_list *head, struct adjslot_list *new)
350{
351 struct adjslot_list *next = head->next;
352 new->prev = head;
353 new->next = next;
354 next->prev = new;
355 head->next = new;
356}
357
358static void adjslot_remove(struct adjslot_list *old)
359{
360 struct adjslot_list *prev = old->prev;
361 struct adjslot_list *next = old->next;
362 next->prev = prev;
363 prev->next = next;
364}
365
366static struct adjslot_list *adjslot_tail(struct adjslot_list *head) {
367 struct adjslot_list *asl = head->prev;
368
369 return asl == head ? NULL : asl;
370}
371
372static void proc_slot(struct proc *procp) {
373 int adjslot = ADJTOSLOT(procp->oomadj);
374
375 adjslot_insert(&procadjslot_list[adjslot], &procp->asl);
376}
377
378static void proc_unslot(struct proc *procp) {
379 adjslot_remove(&procp->asl);
380}
381
382static void proc_insert(struct proc *procp) {
383 int hval = pid_hashfn(procp->pid);
384
385 procp->pidhash_next = pidhash[hval];
386 pidhash[hval] = procp;
387 proc_slot(procp);
388}
389
390static int pid_remove(int pid) {
391 int hval = pid_hashfn(pid);
392 struct proc *procp;
393 struct proc *prevp;
394
395 for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid;
396 procp = procp->pidhash_next)
397 prevp = procp;
398
399 if (!procp)
400 return -1;
401
402 if (!prevp)
403 pidhash[hval] = procp->pidhash_next;
404 else
405 prevp->pidhash_next = procp->pidhash_next;
406
407 proc_unslot(procp);
408 free(procp);
409 return 0;
410}
411
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700412/*
413 * Write a string to a file.
414 * Returns false if the file does not exist.
415 */
416static bool writefilestring(const char *path, const char *s,
417 bool err_if_missing) {
Nick Kralevichc68c8862015-12-18 20:52:37 -0800418 int fd = open(path, O_WRONLY | O_CLOEXEC);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700419 ssize_t len = strlen(s);
420 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700421
422 if (fd < 0) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700423 if (err_if_missing) {
424 ALOGE("Error opening %s; errno=%d", path, errno);
425 }
426 return false;
Todd Poynor3948f802013-07-09 19:35:14 -0700427 }
428
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700429 ret = TEMP_FAILURE_RETRY(write(fd, s, len));
Todd Poynor3948f802013-07-09 19:35:14 -0700430 if (ret < 0) {
431 ALOGE("Error writing %s; errno=%d", path, errno);
432 } else if (ret < len) {
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700433 ALOGE("Short write on %s; length=%zd", path, ret);
Todd Poynor3948f802013-07-09 19:35:14 -0700434 }
435
436 close(fd);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700437 return true;
Todd Poynor3948f802013-07-09 19:35:14 -0700438}
439
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800440static void cmd_procprio(LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700441 struct proc *procp;
442 char path[80];
443 char val[20];
Robert Benea673e2762017-06-01 16:32:31 -0700444 int soft_limit_mult;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800445 struct lmk_procprio params;
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -0700446 bool is_system_server;
447 struct passwd *pwdrec;
Todd Poynor3948f802013-07-09 19:35:14 -0700448
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800449 lmkd_pack_get_procprio(packet, &params);
450
451 if (params.oomadj < OOM_SCORE_ADJ_MIN ||
452 params.oomadj > OOM_SCORE_ADJ_MAX) {
453 ALOGE("Invalid PROCPRIO oomadj argument %d", params.oomadj);
Todd Poynor3948f802013-07-09 19:35:14 -0700454 return;
455 }
456
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800457 snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", params.pid);
458 snprintf(val, sizeof(val), "%d", params.oomadj);
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700459 if (!writefilestring(path, val, false)) {
460 ALOGW("Failed to open %s; errno=%d: process %d might have been killed",
461 path, errno, params.pid);
462 /* If this file does not exist the process is dead. */
463 return;
464 }
Todd Poynor3948f802013-07-09 19:35:14 -0700465
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700466 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700467 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700468 }
Todd Poynor3948f802013-07-09 19:35:14 -0700469
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800470 if (params.oomadj >= 900) {
Robert Benea673e2762017-06-01 16:32:31 -0700471 soft_limit_mult = 0;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800472 } else if (params.oomadj >= 800) {
Robert Benea673e2762017-06-01 16:32:31 -0700473 soft_limit_mult = 0;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800474 } else if (params.oomadj >= 700) {
Robert Benea673e2762017-06-01 16:32:31 -0700475 soft_limit_mult = 0;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800476 } else if (params.oomadj >= 600) {
Robert Beneacaeaa652017-08-11 16:03:20 -0700477 // Launcher should be perceptible, don't kill it.
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800478 params.oomadj = 200;
Robert Beneacaeaa652017-08-11 16:03:20 -0700479 soft_limit_mult = 1;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800480 } else if (params.oomadj >= 500) {
Robert Benea673e2762017-06-01 16:32:31 -0700481 soft_limit_mult = 0;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800482 } else if (params.oomadj >= 400) {
Robert Benea673e2762017-06-01 16:32:31 -0700483 soft_limit_mult = 0;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800484 } else if (params.oomadj >= 300) {
Robert Benea673e2762017-06-01 16:32:31 -0700485 soft_limit_mult = 1;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800486 } else if (params.oomadj >= 200) {
Robert Benea673e2762017-06-01 16:32:31 -0700487 soft_limit_mult = 2;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800488 } else if (params.oomadj >= 100) {
Robert Benea673e2762017-06-01 16:32:31 -0700489 soft_limit_mult = 10;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800490 } else if (params.oomadj >= 0) {
Robert Benea673e2762017-06-01 16:32:31 -0700491 soft_limit_mult = 20;
492 } else {
493 // Persistent processes will have a large
494 // soft limit 512MB.
495 soft_limit_mult = 64;
496 }
497
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800498 snprintf(path, sizeof(path),
499 "/dev/memcg/apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
500 params.uid, params.pid);
Robert Benea673e2762017-06-01 16:32:31 -0700501 snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
Suren Baghdasaryan4311d1e2018-03-20 16:03:29 -0700502
503 /*
504 * system_server process has no memcg under /dev/memcg/apps but should be
505 * registered with lmkd. This is the best way so far to identify it.
506 */
507 is_system_server = (params.oomadj == SYSTEM_ADJ &&
508 (pwdrec = getpwnam("system")) != NULL &&
509 params.uid == pwdrec->pw_uid);
510 writefilestring(path, val, !is_system_server);
Robert Benea673e2762017-06-01 16:32:31 -0700511
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800512 procp = pid_lookup(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700513 if (!procp) {
514 procp = malloc(sizeof(struct proc));
515 if (!procp) {
516 // Oh, the irony. May need to rebuild our state.
517 return;
518 }
519
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800520 procp->pid = params.pid;
521 procp->uid = params.uid;
522 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700523 proc_insert(procp);
524 } else {
525 proc_unslot(procp);
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800526 procp->oomadj = params.oomadj;
Todd Poynor3948f802013-07-09 19:35:14 -0700527 proc_slot(procp);
528 }
529}
530
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800531static void cmd_procremove(LMKD_CTRL_PACKET packet) {
532 struct lmk_procremove params;
533
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700534 if (use_inkernel_interface) {
Todd Poynor3948f802013-07-09 19:35:14 -0700535 return;
Mark Salyzyn721d7c72018-03-21 12:24:58 -0700536 }
Todd Poynor3948f802013-07-09 19:35:14 -0700537
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800538 lmkd_pack_get_procremove(packet, &params);
539 pid_remove(params.pid);
Todd Poynor3948f802013-07-09 19:35:14 -0700540}
541
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800542static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
Todd Poynor3948f802013-07-09 19:35:14 -0700543 int i;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800544 struct lmk_target target;
Todd Poynor3948f802013-07-09 19:35:14 -0700545
546 if (ntargets > (int)ARRAY_SIZE(lowmem_adj))
547 return;
548
549 for (i = 0; i < ntargets; i++) {
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800550 lmkd_pack_get_target(packet, i, &target);
551 lowmem_minfree[i] = target.minfree;
552 lowmem_adj[i] = target.oom_adj_score;
Todd Poynor3948f802013-07-09 19:35:14 -0700553 }
554
555 lowmem_targets_size = ntargets;
556
Robert Benea164baeb2017-09-11 16:53:28 -0700557 if (has_inkernel_module) {
Todd Poynor3948f802013-07-09 19:35:14 -0700558 char minfreestr[128];
559 char killpriostr[128];
560
561 minfreestr[0] = '\0';
562 killpriostr[0] = '\0';
563
564 for (i = 0; i < lowmem_targets_size; i++) {
565 char val[40];
566
567 if (i) {
568 strlcat(minfreestr, ",", sizeof(minfreestr));
569 strlcat(killpriostr, ",", sizeof(killpriostr));
570 }
571
Robert Benea164baeb2017-09-11 16:53:28 -0700572 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700573 strlcat(minfreestr, val, sizeof(minfreestr));
Robert Benea164baeb2017-09-11 16:53:28 -0700574 snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0);
Todd Poynor3948f802013-07-09 19:35:14 -0700575 strlcat(killpriostr, val, sizeof(killpriostr));
576 }
577
Suren Baghdasaryan1ffa2462018-03-20 13:53:17 -0700578 writefilestring(INKERNEL_MINFREE_PATH, minfreestr, true);
579 writefilestring(INKERNEL_ADJ_PATH, killpriostr, true);
Todd Poynor3948f802013-07-09 19:35:14 -0700580 }
581}
582
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800583static void ctrl_data_close(int dsock_idx) {
584 struct epoll_event epev;
585
586 ALOGI("closing lmkd data connection");
587 if (epoll_ctl(epollfd, EPOLL_CTL_DEL, data_sock[dsock_idx].sock, &epev) == -1) {
588 // Log a warning and keep going
589 ALOGW("epoll_ctl for data connection socket failed; errno=%d", errno);
590 }
Todd Poynor3948f802013-07-09 19:35:14 -0700591 maxevents--;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800592
593 close(data_sock[dsock_idx].sock);
594 data_sock[dsock_idx].sock = -1;
Todd Poynor3948f802013-07-09 19:35:14 -0700595}
596
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800597static int ctrl_data_read(int dsock_idx, char *buf, size_t bufsz) {
Todd Poynor3948f802013-07-09 19:35:14 -0700598 int ret = 0;
599
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -0700600 ret = TEMP_FAILURE_RETRY(read(data_sock[dsock_idx].sock, buf, bufsz));
Todd Poynor3948f802013-07-09 19:35:14 -0700601
602 if (ret == -1) {
603 ALOGE("control data socket read failed; errno=%d", errno);
604 } else if (ret == 0) {
605 ALOGE("Got EOF on control data socket");
606 ret = -1;
607 }
608
609 return ret;
610}
611
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800612static void ctrl_command_handler(int dsock_idx) {
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800613 LMKD_CTRL_PACKET packet;
Todd Poynor3948f802013-07-09 19:35:14 -0700614 int len;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800615 enum lmk_cmd cmd;
Todd Poynor3948f802013-07-09 19:35:14 -0700616 int nargs;
617 int targets;
618
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800619 len = ctrl_data_read(dsock_idx, (char *)packet, CTRL_PACKET_MAX_SIZE);
Todd Poynor3948f802013-07-09 19:35:14 -0700620 if (len <= 0)
621 return;
622
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800623 if (len < (int)sizeof(int)) {
624 ALOGE("Wrong control socket read length len=%d", len);
625 return;
626 }
627
628 cmd = lmkd_pack_get_cmd(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700629 nargs = len / sizeof(int) - 1;
630 if (nargs < 0)
631 goto wronglen;
632
Todd Poynor3948f802013-07-09 19:35:14 -0700633 switch(cmd) {
634 case LMK_TARGET:
635 targets = nargs / 2;
636 if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj))
637 goto wronglen;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800638 cmd_target(targets, packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700639 break;
640 case LMK_PROCPRIO:
Colin Crossfbb78c62014-06-13 14:52:43 -0700641 if (nargs != 3)
Todd Poynor3948f802013-07-09 19:35:14 -0700642 goto wronglen;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800643 cmd_procprio(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700644 break;
645 case LMK_PROCREMOVE:
646 if (nargs != 1)
647 goto wronglen;
Suren Baghdasaryana92de712018-03-07 12:27:50 -0800648 cmd_procremove(packet);
Todd Poynor3948f802013-07-09 19:35:14 -0700649 break;
650 default:
651 ALOGE("Received unknown command code %d", cmd);
652 return;
653 }
654
655 return;
656
657wronglen:
658 ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len);
659}
660
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800661static void ctrl_data_handler(int data, uint32_t events) {
662 if (events & EPOLLIN) {
663 ctrl_command_handler(data);
Todd Poynor3948f802013-07-09 19:35:14 -0700664 }
665}
666
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800667static int get_free_dsock() {
668 for (int i = 0; i < MAX_DATA_CONN; i++) {
669 if (data_sock[i].sock < 0) {
670 return i;
671 }
672 }
673 return -1;
674}
Todd Poynor3948f802013-07-09 19:35:14 -0700675
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800676static void ctrl_connect_handler(int data __unused, uint32_t events __unused) {
677 struct epoll_event epev;
678 int free_dscock_idx = get_free_dsock();
679
680 if (free_dscock_idx < 0) {
681 /*
682 * Number of data connections exceeded max supported. This should not
683 * happen but if it does we drop all existing connections and accept
684 * the new one. This prevents inactive connections from monopolizing
685 * data socket and if we drop ActivityManager connection it will
686 * immediately reconnect.
687 */
688 for (int i = 0; i < MAX_DATA_CONN; i++) {
689 ctrl_data_close(i);
690 }
691 free_dscock_idx = 0;
Todd Poynor3948f802013-07-09 19:35:14 -0700692 }
693
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800694 data_sock[free_dscock_idx].sock = accept(ctrl_sock.sock, NULL, NULL);
695 if (data_sock[free_dscock_idx].sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700696 ALOGE("lmkd control socket accept failed; errno=%d", errno);
697 return;
698 }
699
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800700 ALOGI("lmkd data connection established");
701 /* use data to store data connection idx */
702 data_sock[free_dscock_idx].handler_info.data = free_dscock_idx;
703 data_sock[free_dscock_idx].handler_info.handler = ctrl_data_handler;
Todd Poynor3948f802013-07-09 19:35:14 -0700704 epev.events = EPOLLIN;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800705 epev.data.ptr = (void *)&(data_sock[free_dscock_idx].handler_info);
706 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, data_sock[free_dscock_idx].sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -0700707 ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno);
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800708 ctrl_data_close(free_dscock_idx);
Todd Poynor3948f802013-07-09 19:35:14 -0700709 return;
710 }
Suren Baghdasaryan06f75702018-01-26 12:51:19 -0800711 maxevents++;
Todd Poynor3948f802013-07-09 19:35:14 -0700712}
713
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700714/* /prop/zoneinfo parsing routines */
715static int64_t zoneinfo_parse_protection(char *cp) {
716 int64_t max = 0;
717 long long zoneval;
Colin Crossce85d952014-07-11 17:53:27 -0700718 char *save_ptr;
Todd Poynor3948f802013-07-09 19:35:14 -0700719
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700720 for (cp = strtok_r(cp, "(), ", &save_ptr); cp;
721 cp = strtok_r(NULL, "), ", &save_ptr)) {
722 zoneval = strtoll(cp, &cp, 0);
723 if (zoneval > max) {
724 max = (zoneval > INT64_MAX) ? INT64_MAX : zoneval;
725 }
Colin Crossce85d952014-07-11 17:53:27 -0700726 }
Todd Poynor3948f802013-07-09 19:35:14 -0700727
728 return max;
729}
730
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700731static bool zoneinfo_parse_line(char *line, union zoneinfo *zi) {
Todd Poynor3948f802013-07-09 19:35:14 -0700732 char *cp = line;
733 char *ap;
Colin Crossce85d952014-07-11 17:53:27 -0700734 char *save_ptr;
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700735 int64_t val;
736 int field_idx;
Todd Poynor3948f802013-07-09 19:35:14 -0700737
Colin Crossce85d952014-07-11 17:53:27 -0700738 cp = strtok_r(line, " ", &save_ptr);
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700739 if (!cp) {
740 return true;
741 }
Todd Poynor3948f802013-07-09 19:35:14 -0700742
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700743 if (!strcmp(cp, "protection:")) {
744 ap = strtok_r(NULL, ")", &save_ptr);
745 } else {
746 ap = strtok_r(NULL, " ", &save_ptr);
747 }
Todd Poynor3948f802013-07-09 19:35:14 -0700748
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700749 if (!ap) {
750 return true;
751 }
752
753 switch (match_field(cp, ap, zoneinfo_field_names,
754 ZI_FIELD_COUNT, &val, &field_idx)) {
755 case (PARSE_SUCCESS):
756 zi->arr[field_idx] += val;
757 break;
758 case (NO_MATCH):
759 if (!strcmp(cp, "protection:")) {
760 zi->field.totalreserve_pages +=
761 zoneinfo_parse_protection(ap);
762 }
763 break;
764 case (PARSE_FAIL):
765 default:
766 return false;
767 }
768 return true;
Todd Poynor3948f802013-07-09 19:35:14 -0700769}
770
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700771static int zoneinfo_parse(union zoneinfo *zi) {
772 static struct reread_data file_data = {
773 .filename = ZONEINFO_PATH,
774 .fd = -1,
775 };
Colin Crossce85d952014-07-11 17:53:27 -0700776 char buf[PAGE_SIZE];
777 char *save_ptr;
778 char *line;
Todd Poynor3948f802013-07-09 19:35:14 -0700779
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700780 memset(zi, 0, sizeof(union zoneinfo));
Colin Crossce85d952014-07-11 17:53:27 -0700781
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700782 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700783 return -1;
784 }
785
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700786 for (line = strtok_r(buf, "\n", &save_ptr); line;
787 line = strtok_r(NULL, "\n", &save_ptr)) {
788 if (!zoneinfo_parse_line(line, zi)) {
789 ALOGE("%s parse error", file_data.filename);
790 return -1;
791 }
792 }
793 zi->field.totalreserve_pages += zi->field.high;
794
795 return 0;
796}
797
798/* /prop/meminfo parsing routines */
799static bool meminfo_parse_line(char *line, union meminfo *mi) {
800 char *cp = line;
801 char *ap;
802 char *save_ptr;
803 int64_t val;
804 int field_idx;
805 enum field_match_result match_res;
806
807 cp = strtok_r(line, " ", &save_ptr);
808 if (!cp) {
809 return false;
810 }
811
812 ap = strtok_r(NULL, " ", &save_ptr);
813 if (!ap) {
814 return false;
815 }
816
817 match_res = match_field(cp, ap, meminfo_field_names, MI_FIELD_COUNT,
818 &val, &field_idx);
819 if (match_res == PARSE_SUCCESS) {
820 mi->arr[field_idx] = val / page_k;
821 }
822 return (match_res != PARSE_FAIL);
823}
824
825static int meminfo_parse(union meminfo *mi) {
826 static struct reread_data file_data = {
827 .filename = MEMINFO_PATH,
828 .fd = -1,
829 };
830 char buf[PAGE_SIZE];
831 char *save_ptr;
832 char *line;
833
834 memset(mi, 0, sizeof(union meminfo));
835
836 if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
Colin Crossce85d952014-07-11 17:53:27 -0700837 return -1;
838 }
Colin Crossce85d952014-07-11 17:53:27 -0700839
Suren Baghdasaryanceffb412018-04-13 13:11:51 -0700840 for (line = strtok_r(buf, "\n", &save_ptr); line;
841 line = strtok_r(NULL, "\n", &save_ptr)) {
842 if (!meminfo_parse_line(line, mi)) {
843 ALOGE("%s parse error", file_data.filename);
844 return -1;
845 }
846 }
847 mi->field.nr_file_pages = mi->field.cached + mi->field.swap_cached +
848 mi->field.buffers;
Todd Poynor3948f802013-07-09 19:35:14 -0700849
Todd Poynor3948f802013-07-09 19:35:14 -0700850 return 0;
851}
852
853static int proc_get_size(int pid) {
854 char path[PATH_MAX];
855 char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700856 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700857 int rss = 0;
858 int total;
Colin Crossce85d952014-07-11 17:53:27 -0700859 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700860
861 snprintf(path, PATH_MAX, "/proc/%d/statm", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800862 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700863 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700864 return -1;
Colin Crossce85d952014-07-11 17:53:27 -0700865
866 ret = read_all(fd, line, sizeof(line) - 1);
867 if (ret < 0) {
868 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700869 return -1;
870 }
871
872 sscanf(line, "%d %d ", &total, &rss);
Colin Crossce85d952014-07-11 17:53:27 -0700873 close(fd);
Todd Poynor3948f802013-07-09 19:35:14 -0700874 return rss;
875}
876
877static char *proc_get_name(int pid) {
878 char path[PATH_MAX];
879 static char line[LINE_MAX];
Colin Crossce85d952014-07-11 17:53:27 -0700880 int fd;
Todd Poynor3948f802013-07-09 19:35:14 -0700881 char *cp;
Colin Crossce85d952014-07-11 17:53:27 -0700882 ssize_t ret;
Todd Poynor3948f802013-07-09 19:35:14 -0700883
884 snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid);
Nick Kralevichc68c8862015-12-18 20:52:37 -0800885 fd = open(path, O_RDONLY | O_CLOEXEC);
Colin Crossce85d952014-07-11 17:53:27 -0700886 if (fd == -1)
Todd Poynor3948f802013-07-09 19:35:14 -0700887 return NULL;
Colin Crossce85d952014-07-11 17:53:27 -0700888 ret = read_all(fd, line, sizeof(line) - 1);
889 close(fd);
890 if (ret < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -0700891 return NULL;
892 }
893
894 cp = strchr(line, ' ');
895 if (cp)
896 *cp = '\0';
897
898 return line;
899}
900
901static struct proc *proc_adj_lru(int oomadj) {
902 return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]);
903}
904
Suren Baghdasaryanb93764d2017-12-08 13:17:06 -0800905static struct proc *proc_get_heaviest(int oomadj) {
906 struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)];
907 struct adjslot_list *curr = head->next;
908 struct proc *maxprocp = NULL;
909 int maxsize = 0;
910 while (curr != head) {
911 int pid = ((struct proc *)curr)->pid;
912 int tasksize = proc_get_size(pid);
913 if (tasksize <= 0) {
914 struct adjslot_list *next = curr->next;
915 pid_remove(pid);
916 curr = next;
917 } else {
918 if (tasksize > maxsize) {
919 maxsize = tasksize;
920 maxprocp = (struct proc *)curr;
921 }
922 curr = curr->next;
923 }
924 }
925 return maxprocp;
926}
927
Colin Cross16b09462014-07-14 12:39:56 -0700928/* Kill one process specified by procp. Returns the size of the process killed */
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800929static int kill_one_process(struct proc* procp, int min_score_adj,
930 enum vmpressure_level level) {
Colin Cross16b09462014-07-14 12:39:56 -0700931 int pid = procp->pid;
932 uid_t uid = procp->uid;
933 char *taskname;
934 int tasksize;
935 int r;
936
937 taskname = proc_get_name(pid);
938 if (!taskname) {
939 pid_remove(pid);
940 return -1;
941 }
942
943 tasksize = proc_get_size(pid);
944 if (tasksize <= 0) {
945 pid_remove(pid);
946 return -1;
947 }
948
Suren Baghdasaryane1217c02018-01-04 10:43:58 -0800949 TRACE_KILL_START(pid);
950
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800951 r = kill(pid, SIGKILL);
Robert Beneacaeaa652017-08-11 16:03:20 -0700952 ALOGI(
953 "Killing '%s' (%d), uid %d, adj %d\n"
Suren Baghdasaryand07a94f2018-03-20 16:25:54 -0700954 " to free %ldkB because system is under %s memory pressure (min_oom_adj=%d)\n",
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800955 taskname, pid, uid, procp->oomadj, tasksize * page_k,
956 level_name[level], min_score_adj);
Colin Cross16b09462014-07-14 12:39:56 -0700957 pid_remove(pid);
958
Suren Baghdasaryane1217c02018-01-04 10:43:58 -0800959 TRACE_KILL_END();
960
Colin Cross16b09462014-07-14 12:39:56 -0700961 if (r) {
Mark Salyzyn919f5382018-02-04 15:27:23 -0800962 ALOGE("kill(%d): errno=%d", pid, errno);
Colin Cross16b09462014-07-14 12:39:56 -0700963 return -1;
Colin Cross16b09462014-07-14 12:39:56 -0700964 }
Mark Salyzyn919f5382018-02-04 15:27:23 -0800965
966 return tasksize;
Colin Cross16b09462014-07-14 12:39:56 -0700967}
968
969/*
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800970 * Find processes to kill to free required number of pages.
971 * If pages_to_free is set to 0 only one process will be killed.
972 * Returns the size of the killed processes.
Colin Cross16b09462014-07-14 12:39:56 -0700973 */
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800974static int find_and_kill_processes(enum vmpressure_level level,
975 int pages_to_free) {
Colin Cross16b09462014-07-14 12:39:56 -0700976 int i;
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800977 int killed_size;
978 int pages_freed = 0;
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800979 int min_score_adj = level_oomadj[level];
Colin Cross16b09462014-07-14 12:39:56 -0700980
Chong Zhang0a4acdf2015-10-14 16:19:53 -0700981 for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
Colin Cross16b09462014-07-14 12:39:56 -0700982 struct proc *procp;
983
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800984 while (true) {
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -0700985 procp = kill_heaviest_task ?
986 proc_get_heaviest(i) : proc_adj_lru(i);
Colin Cross16b09462014-07-14 12:39:56 -0700987
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800988 if (!procp)
989 break;
990
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -0800991 killed_size = kill_one_process(procp, min_score_adj, level);
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -0800992 if (killed_size >= 0) {
993 pages_freed += killed_size;
994 if (pages_freed >= pages_to_free) {
995 return pages_freed;
996 }
Colin Cross16b09462014-07-14 12:39:56 -0700997 }
998 }
999 }
1000
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001001 return pages_freed;
Colin Cross16b09462014-07-14 12:39:56 -07001002}
1003
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001004static int64_t get_memory_usage(struct reread_data *file_data) {
Robert Beneac47f2992017-08-21 15:18:31 -07001005 int ret;
1006 int64_t mem_usage;
1007 char buf[32];
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001008
1009 if (reread_file(file_data, buf, sizeof(buf)) < 0) {
Robert Beneac47f2992017-08-21 15:18:31 -07001010 return -1;
1011 }
1012
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001013 if (!parse_int64(buf, &mem_usage)) {
1014 ALOGE("%s parse error", file_data->filename);
Robert Beneac47f2992017-08-21 15:18:31 -07001015 return -1;
1016 }
Robert Beneac47f2992017-08-21 15:18:31 -07001017 if (mem_usage == 0) {
1018 ALOGE("No memory!");
1019 return -1;
1020 }
1021 return mem_usage;
1022}
1023
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001024void record_low_pressure_levels(union meminfo *mi) {
1025 if (low_pressure_mem.min_nr_free_pages == -1 ||
1026 low_pressure_mem.min_nr_free_pages > mi->field.nr_free_pages) {
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001027 if (debug_process_killing) {
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001028 ALOGI("Low pressure min memory update from %" PRId64 " to %" PRId64,
1029 low_pressure_mem.min_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001030 }
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001031 low_pressure_mem.min_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001032 }
1033 /*
1034 * Free memory at low vmpressure events occasionally gets spikes,
1035 * possibly a stale low vmpressure event with memory already
1036 * freed up (no memory pressure should have been reported).
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001037 * Ignore large jumps in max_nr_free_pages that would mess up our stats.
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001038 */
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001039 if (low_pressure_mem.max_nr_free_pages == -1 ||
1040 (low_pressure_mem.max_nr_free_pages < mi->field.nr_free_pages &&
1041 mi->field.nr_free_pages - low_pressure_mem.max_nr_free_pages <
1042 low_pressure_mem.max_nr_free_pages * 0.1)) {
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001043 if (debug_process_killing) {
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001044 ALOGI("Low pressure max memory update from %" PRId64 " to %" PRId64,
1045 low_pressure_mem.max_nr_free_pages, mi->field.nr_free_pages);
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001046 }
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001047 low_pressure_mem.max_nr_free_pages = mi->field.nr_free_pages;
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001048 }
1049}
1050
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001051enum vmpressure_level upgrade_level(enum vmpressure_level level) {
1052 return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ?
1053 level + 1 : level);
1054}
1055
1056enum vmpressure_level downgrade_level(enum vmpressure_level level) {
1057 return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ?
1058 level - 1 : level);
1059}
1060
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -08001061static inline unsigned long get_time_diff_ms(struct timeval *from,
1062 struct timeval *to) {
1063 return (to->tv_sec - from->tv_sec) * 1000 +
1064 (to->tv_usec - from->tv_usec) / 1000;
1065}
1066
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001067static void mp_event_common(int data, uint32_t events __unused) {
Todd Poynor3948f802013-07-09 19:35:14 -07001068 int ret;
1069 unsigned long long evcount;
Robert Beneac47f2992017-08-21 15:18:31 -07001070 int64_t mem_usage, memsw_usage;
Robert Benea6e8e7102017-09-13 15:20:30 -07001071 int64_t mem_pressure;
Suren Baghdasaryan1a2589e2018-01-04 09:16:21 -08001072 enum vmpressure_level lvl;
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001073 union meminfo mi;
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -08001074 static struct timeval last_report_tm;
1075 static unsigned long skip_count = 0;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001076 enum vmpressure_level level = (enum vmpressure_level)data;
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001077 static struct reread_data mem_usage_file_data = {
1078 .filename = MEMCG_MEMORY_USAGE,
1079 .fd = -1,
1080 };
1081 static struct reread_data memsw_usage_file_data = {
1082 .filename = MEMCG_MEMORYSW_USAGE,
1083 .fd = -1,
1084 };
Todd Poynor3948f802013-07-09 19:35:14 -07001085
Suren Baghdasaryan1a2589e2018-01-04 09:16:21 -08001086 /*
1087 * Check all event counters from low to critical
1088 * and upgrade to the highest priority one. By reading
1089 * eventfd we also reset the event counters.
1090 */
1091 for (lvl = VMPRESS_LEVEL_LOW; lvl < VMPRESS_LEVEL_COUNT; lvl++) {
1092 if (mpevfd[lvl] != -1 &&
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001093 TEMP_FAILURE_RETRY(read(mpevfd[lvl],
1094 &evcount, sizeof(evcount))) > 0 &&
Suren Baghdasaryan1a2589e2018-01-04 09:16:21 -08001095 evcount > 0 && lvl > level) {
1096 level = lvl;
1097 }
1098 }
Todd Poynor3948f802013-07-09 19:35:14 -07001099
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -08001100 if (kill_timeout_ms) {
1101 struct timeval curr_tm;
1102 gettimeofday(&curr_tm, NULL);
1103 if (get_time_diff_ms(&last_report_tm, &curr_tm) < kill_timeout_ms) {
1104 skip_count++;
1105 return;
1106 }
1107 }
1108
1109 if (skip_count > 0) {
1110 if (debug_process_killing) {
1111 ALOGI("%lu memory pressure events were skipped after a kill!",
1112 skip_count);
1113 }
1114 skip_count = 0;
1115 }
1116
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001117 if (meminfo_parse(&mi) < 0) {
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001118 ALOGE("Failed to get free memory!");
1119 return;
1120 }
1121
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001122 if (level == VMPRESS_LEVEL_LOW) {
1123 record_low_pressure_levels(&mi);
1124 }
1125
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001126 if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) {
1127 /* Do not monitor this pressure level */
1128 return;
1129 }
1130
Suren Baghdasaryan6499e5e2018-04-13 12:43:41 -07001131 if ((mem_usage = get_memory_usage(&mem_usage_file_data)) < 0) {
1132 goto do_kill;
1133 }
1134 if ((memsw_usage = get_memory_usage(&memsw_usage_file_data)) < 0) {
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001135 goto do_kill;
Robert Benea6e8e7102017-09-13 15:20:30 -07001136 }
Robert Beneac47f2992017-08-21 15:18:31 -07001137
Robert Benea6e8e7102017-09-13 15:20:30 -07001138 // Calculate percent for swappinness.
1139 mem_pressure = (mem_usage * 100) / memsw_usage;
1140
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001141 if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) {
Robert Benea6e8e7102017-09-13 15:20:30 -07001142 // We are swapping too much.
1143 if (mem_pressure < upgrade_pressure) {
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001144 level = upgrade_level(level);
1145 if (debug_process_killing) {
1146 ALOGI("Event upgraded to %s", level_name[level]);
1147 }
Robert Beneac47f2992017-08-21 15:18:31 -07001148 }
1149 }
1150
Robert Benea6e8e7102017-09-13 15:20:30 -07001151 // If the pressure is larger than downgrade_pressure lmk will not
1152 // kill any process, since enough memory is available.
1153 if (mem_pressure > downgrade_pressure) {
1154 if (debug_process_killing) {
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001155 ALOGI("Ignore %s memory pressure", level_name[level]);
Robert Benea6e8e7102017-09-13 15:20:30 -07001156 }
1157 return;
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001158 } else if (level == VMPRESS_LEVEL_CRITICAL &&
1159 mem_pressure > upgrade_pressure) {
Robert Benea6e8e7102017-09-13 15:20:30 -07001160 if (debug_process_killing) {
1161 ALOGI("Downgrade critical memory pressure");
1162 }
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001163 // Downgrade event, since enough memory available.
1164 level = downgrade_level(level);
Robert Benea6e8e7102017-09-13 15:20:30 -07001165 }
1166
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001167do_kill:
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001168 if (low_ram_device) {
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001169 /* For Go devices kill only one task */
1170 if (find_and_kill_processes(level, 0) == 0) {
1171 if (debug_process_killing) {
1172 ALOGI("Nothing to kill");
1173 }
1174 }
1175 } else {
1176 /* If pressure level is less than critical and enough free swap then ignore */
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001177 if (level < VMPRESS_LEVEL_CRITICAL &&
1178 mi.field.free_swap > low_pressure_mem.max_nr_free_pages) {
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001179 if (debug_process_killing) {
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001180 ALOGI("Ignoring pressure since %" PRId64
1181 " swap pages are available ",
1182 mi.field.free_swap);
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001183 }
1184 return;
1185 }
1186
1187 /* Free up enough memory to downgrate the memory pressure to low level */
Suren Baghdasaryan45c9e0b2018-04-13 13:41:12 -07001188 if (mi.field.nr_free_pages < low_pressure_mem.max_nr_free_pages) {
1189 int pages_to_free = low_pressure_mem.max_nr_free_pages -
1190 mi.field.nr_free_pages;
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001191 if (debug_process_killing) {
1192 ALOGI("Trying to free %d pages", pages_to_free);
1193 }
1194 int pages_freed = find_and_kill_processes(level, pages_to_free);
1195 if (pages_freed < pages_to_free) {
1196 if (debug_process_killing) {
1197 ALOGI("Unable to free enough memory (pages freed=%d)",
1198 pages_freed);
1199 }
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -08001200 } else {
1201 gettimeofday(&last_report_tm, NULL);
Suren Baghdasaryanaa73baf2018-01-17 17:17:44 -08001202 }
Robert Beneacaeaa652017-08-11 16:03:20 -07001203 }
Colin Crossf8857cc2014-07-11 17:16:56 -07001204 }
Todd Poynor3948f802013-07-09 19:35:14 -07001205}
1206
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001207static bool init_mp_common(enum vmpressure_level level) {
Todd Poynor3948f802013-07-09 19:35:14 -07001208 int mpfd;
1209 int evfd;
1210 int evctlfd;
1211 char buf[256];
1212 struct epoll_event epev;
1213 int ret;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001214 int level_idx = (int)level;
1215 const char *levelstr = level_name[level_idx];
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001216
Nick Kralevichc68c8862015-12-18 20:52:37 -08001217 mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001218 if (mpfd < 0) {
1219 ALOGI("No kernel memory.pressure_level support (errno=%d)", errno);
1220 goto err_open_mpfd;
1221 }
1222
Nick Kralevichc68c8862015-12-18 20:52:37 -08001223 evctlfd = open(MEMCG_SYSFS_PATH "cgroup.event_control", O_WRONLY | O_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001224 if (evctlfd < 0) {
1225 ALOGI("No kernel memory cgroup event control (errno=%d)", errno);
1226 goto err_open_evctlfd;
1227 }
1228
Nick Kralevichc68c8862015-12-18 20:52:37 -08001229 evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
Todd Poynor3948f802013-07-09 19:35:14 -07001230 if (evfd < 0) {
1231 ALOGE("eventfd failed for level %s; errno=%d", levelstr, errno);
1232 goto err_eventfd;
1233 }
1234
1235 ret = snprintf(buf, sizeof(buf), "%d %d %s", evfd, mpfd, levelstr);
1236 if (ret >= (ssize_t)sizeof(buf)) {
1237 ALOGE("cgroup.event_control line overflow for level %s", levelstr);
1238 goto err;
1239 }
1240
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001241 ret = TEMP_FAILURE_RETRY(write(evctlfd, buf, strlen(buf) + 1));
Todd Poynor3948f802013-07-09 19:35:14 -07001242 if (ret == -1) {
1243 ALOGE("cgroup.event_control write failed for level %s; errno=%d",
1244 levelstr, errno);
1245 goto err;
1246 }
1247
1248 epev.events = EPOLLIN;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001249 /* use data to store event level */
1250 vmpressure_hinfo[level_idx].data = level_idx;
1251 vmpressure_hinfo[level_idx].handler = mp_event_common;
1252 epev.data.ptr = (void *)&vmpressure_hinfo[level_idx];
Todd Poynor3948f802013-07-09 19:35:14 -07001253 ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, evfd, &epev);
1254 if (ret == -1) {
1255 ALOGE("epoll_ctl for level %s failed; errno=%d", levelstr, errno);
1256 goto err;
1257 }
1258 maxevents++;
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001259 mpevfd[level] = evfd;
Suren Baghdasaryanab05d672018-01-04 08:54:53 -08001260 close(evctlfd);
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001261 return true;
Todd Poynor3948f802013-07-09 19:35:14 -07001262
1263err:
1264 close(evfd);
1265err_eventfd:
1266 close(evctlfd);
1267err_open_evctlfd:
1268 close(mpfd);
1269err_open_mpfd:
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001270 return false;
Robert Benea673e2762017-06-01 16:32:31 -07001271}
1272
Todd Poynor3948f802013-07-09 19:35:14 -07001273static int init(void) {
1274 struct epoll_event epev;
1275 int i;
1276 int ret;
1277
1278 page_k = sysconf(_SC_PAGESIZE);
1279 if (page_k == -1)
1280 page_k = PAGE_SIZE;
1281 page_k /= 1024;
1282
1283 epollfd = epoll_create(MAX_EPOLL_EVENTS);
1284 if (epollfd == -1) {
1285 ALOGE("epoll_create failed (errno=%d)", errno);
1286 return -1;
1287 }
1288
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001289 // mark data connections as not connected
1290 for (int i = 0; i < MAX_DATA_CONN; i++) {
1291 data_sock[i].sock = -1;
1292 }
1293
1294 ctrl_sock.sock = android_get_control_socket("lmkd");
1295 if (ctrl_sock.sock < 0) {
Todd Poynor3948f802013-07-09 19:35:14 -07001296 ALOGE("get lmkd control socket failed");
1297 return -1;
1298 }
1299
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001300 ret = listen(ctrl_sock.sock, MAX_DATA_CONN);
Todd Poynor3948f802013-07-09 19:35:14 -07001301 if (ret < 0) {
1302 ALOGE("lmkd control socket listen failed (errno=%d)", errno);
1303 return -1;
1304 }
1305
1306 epev.events = EPOLLIN;
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001307 ctrl_sock.handler_info.handler = ctrl_connect_handler;
1308 epev.data.ptr = (void *)&(ctrl_sock.handler_info);
1309 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_sock.sock, &epev) == -1) {
Todd Poynor3948f802013-07-09 19:35:14 -07001310 ALOGE("epoll_ctl for lmkd control socket failed (errno=%d)", errno);
1311 return -1;
1312 }
1313 maxevents++;
1314
Robert Benea164baeb2017-09-11 16:53:28 -07001315 has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK);
Suren Baghdasaryan2088f6a2018-01-18 17:27:30 -08001316 use_inkernel_interface = has_inkernel_module;
Todd Poynor3948f802013-07-09 19:35:14 -07001317
1318 if (use_inkernel_interface) {
1319 ALOGI("Using in-kernel low memory killer interface");
1320 } else {
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001321 if (!init_mp_common(VMPRESS_LEVEL_LOW) ||
1322 !init_mp_common(VMPRESS_LEVEL_MEDIUM) ||
1323 !init_mp_common(VMPRESS_LEVEL_CRITICAL)) {
Todd Poynor3948f802013-07-09 19:35:14 -07001324 ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001325 return -1;
1326 }
Todd Poynor3948f802013-07-09 19:35:14 -07001327 }
1328
Chong Zhang0a4acdf2015-10-14 16:19:53 -07001329 for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
Todd Poynor3948f802013-07-09 19:35:14 -07001330 procadjslot_list[i].next = &procadjslot_list[i];
1331 procadjslot_list[i].prev = &procadjslot_list[i];
1332 }
1333
1334 return 0;
1335}
1336
1337static void mainloop(void) {
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001338 struct event_handler_info* handler_info;
1339 struct epoll_event *evt;
1340
Todd Poynor3948f802013-07-09 19:35:14 -07001341 while (1) {
1342 struct epoll_event events[maxevents];
1343 int nevents;
1344 int i;
1345
Todd Poynor3948f802013-07-09 19:35:14 -07001346 nevents = epoll_wait(epollfd, events, maxevents, -1);
1347
1348 if (nevents == -1) {
1349 if (errno == EINTR)
1350 continue;
1351 ALOGE("epoll_wait failed (errno=%d)", errno);
1352 continue;
1353 }
1354
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001355 /*
1356 * First pass to see if any data socket connections were dropped.
1357 * Dropped connection should be handled before any other events
1358 * to deallocate data connection and correctly handle cases when
1359 * connection gets dropped and reestablished in the same epoll cycle.
1360 * In such cases it's essential to handle connection closures first.
1361 */
1362 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1363 if ((evt->events & EPOLLHUP) && evt->data.ptr) {
1364 ALOGI("lmkd data connection dropped");
1365 handler_info = (struct event_handler_info*)evt->data.ptr;
1366 ctrl_data_close(handler_info->data);
1367 }
1368 }
1369
1370 /* Second pass to handle all other events */
1371 for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
1372 if (evt->events & EPOLLERR)
Todd Poynor3948f802013-07-09 19:35:14 -07001373 ALOGD("EPOLLERR on event #%d", i);
Suren Baghdasaryan06f75702018-01-26 12:51:19 -08001374 if (evt->events & EPOLLHUP) {
1375 /* This case was handled in the first pass */
1376 continue;
1377 }
1378 if (evt->data.ptr) {
1379 handler_info = (struct event_handler_info*)evt->data.ptr;
1380 handler_info->handler(handler_info->data, evt->events);
1381 }
Todd Poynor3948f802013-07-09 19:35:14 -07001382 }
1383 }
1384}
1385
Mark Salyzyne6ed68b2014-04-30 13:36:35 -07001386int main(int argc __unused, char **argv __unused) {
Colin Cross1a0d9be2014-07-14 14:31:15 -07001387 struct sched_param param = {
1388 .sched_priority = 1,
1389 };
1390
Suren Baghdasaryancd7ad2f2017-12-08 12:58:52 -08001391 /* By default disable low level vmpressure events */
1392 level_oomadj[VMPRESS_LEVEL_LOW] =
1393 property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1);
1394 level_oomadj[VMPRESS_LEVEL_MEDIUM] =
1395 property_get_int32("ro.lmk.medium", 800);
1396 level_oomadj[VMPRESS_LEVEL_CRITICAL] =
1397 property_get_int32("ro.lmk.critical", 0);
Robert Beneacaeaa652017-08-11 16:03:20 -07001398 debug_process_killing = property_get_bool("ro.lmk.debug", false);
Suren Baghdasaryane5c964312017-12-08 13:08:41 -08001399
1400 /* By default disable upgrade/downgrade logic */
1401 enable_pressure_upgrade =
1402 property_get_bool("ro.lmk.critical_upgrade", false);
1403 upgrade_pressure =
1404 (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100);
1405 downgrade_pressure =
1406 (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100);
Suren Baghdasaryanb93764d2017-12-08 13:17:06 -08001407 kill_heaviest_task =
Suren Baghdasaryan818b59b2018-04-13 11:49:54 -07001408 property_get_bool("ro.lmk.kill_heaviest_task", false);
Suren Baghdasaryanff61afb2018-04-13 11:45:38 -07001409 low_ram_device = property_get_bool("ro.config.low_ram", false);
Suren Baghdasaryan63dadcf2018-01-17 17:28:01 -08001410 kill_timeout_ms =
1411 (unsigned long)property_get_int32("ro.lmk.kill_timeout_ms", 0);
Robert Benea58891d52017-07-31 17:15:20 -07001412
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001413 if (!init()) {
1414 if (!use_inkernel_interface) {
1415 /*
1416 * MCL_ONFAULT pins pages as they fault instead of loading
1417 * everything immediately all at once. (Which would be bad,
1418 * because as of this writing, we have a lot of mapped pages we
1419 * never use.) Old kernels will see MCL_ONFAULT and fail with
1420 * EINVAL; we ignore this failure.
1421 *
1422 * N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT
1423 * pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault
1424 * in pages.
1425 */
1426 if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && (errno != EINVAL)) {
1427 ALOGW("mlockall failed %s", strerror(errno));
1428 }
Daniel Colascione4dd5d002018-01-03 12:01:02 -08001429
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001430 sched_setscheduler(0, SCHED_FIFO, &param);
1431 }
1432
Todd Poynor3948f802013-07-09 19:35:14 -07001433 mainloop();
Mark Salyzyn721d7c72018-03-21 12:24:58 -07001434 }
Todd Poynor3948f802013-07-09 19:35:14 -07001435
1436 ALOGI("exiting");
1437 return 0;
1438}