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1045 lines
27 KiB
1045 lines
27 KiB
/* |
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* Copyright (C) 2013 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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|
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#define LOG_TAG "lowmemorykiller" |
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|
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#include <arpa/inet.h> |
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#include <errno.h> |
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#include <inttypes.h> |
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#include <sched.h> |
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#include <signal.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/cdefs.h> |
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#include <sys/epoll.h> |
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#include <sys/eventfd.h> |
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#include <sys/mman.h> |
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#include <sys/socket.h> |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <time.h> |
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#include <unistd.h> |
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|
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#include <cutils/properties.h> |
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#include <cutils/sockets.h> |
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#include <log/log.h> |
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#include <processgroup/processgroup.h> |
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|
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#ifndef __unused |
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#define __unused __attribute__((__unused__)) |
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#endif |
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|
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#define MEMCG_SYSFS_PATH "/dev/memcg/" |
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#define MEMCG_MEMORY_USAGE "/dev/memcg/memory.usage_in_bytes" |
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#define MEMCG_MEMORYSW_USAGE "/dev/memcg/memory.memsw.usage_in_bytes" |
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#define MEMPRESSURE_WATCH_MEDIUM_LEVEL "medium" |
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#define MEMPRESSURE_WATCH_CRITICAL_LEVEL "critical" |
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#define ZONEINFO_PATH "/proc/zoneinfo" |
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#define LINE_MAX 128 |
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|
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#define INKERNEL_MINFREE_PATH "/sys/module/lowmemorykiller/parameters/minfree" |
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#define INKERNEL_ADJ_PATH "/sys/module/lowmemorykiller/parameters/adj" |
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|
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) |
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#define EIGHT_MEGA (1 << 23) |
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|
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enum lmk_cmd { |
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LMK_TARGET, |
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LMK_PROCPRIO, |
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LMK_PROCREMOVE, |
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LMK_MEDLOOSEN, |
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}; |
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|
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#define MAX_TARGETS 6 |
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/* |
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* longest is LMK_TARGET followed by MAX_TARGETS each minfree and minkillprio |
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* values |
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*/ |
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#define CTRL_PACKET_MAX (sizeof(int) * (MAX_TARGETS * 2 + 1)) |
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|
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/* A threshold of minfree adjustment toward CRITICAL (36MB) */ |
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#define CACHED_THRESHOLD (9216) |
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|
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/* default to old in-kernel interface if no memory pressure events */ |
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static int use_inkernel_interface = 1; |
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static bool has_inkernel_module; |
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|
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/* memory pressure level medium event */ |
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static int mpevfd[2]; |
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#define CRITICAL_INDEX 1 |
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#define MEDIUM_INDEX 0 |
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|
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static int medium_oomadj, orig_medium_oomadj; |
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static int critical_oomadj; |
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static bool debug_process_killing; |
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static bool enable_pressure_upgrade; |
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static int64_t upgrade_pressure; |
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static int64_t downgrade_pressure; |
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static bool is_go_device; |
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|
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/* control socket listen and data */ |
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static int ctrl_lfd; |
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static int ctrl_dfd = -1; |
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static int ctrl_dfd_reopened; /* did we reopen ctrl conn on this loop? */ |
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|
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/* 2 memory pressure levels, 1 ctrl listen socket, 1 ctrl data socket */ |
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#define MAX_EPOLL_EVENTS 4 |
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static int epollfd; |
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static int maxevents; |
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|
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/* OOM score values used by both kernel and framework */ |
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#define OOM_SCORE_ADJ_MIN (-1000) |
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#define OOM_SCORE_ADJ_MAX 1000 |
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|
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static int lowmem_adj[MAX_TARGETS]; |
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static int lowmem_minfree[MAX_TARGETS] = { CACHED_THRESHOLD }; |
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static int lowmem_targets_size; |
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|
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struct sysmeminfo { |
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int nr_free_pages; |
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int nr_file_pages; |
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int nr_unevictable; |
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int nr_shmem; |
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int totalreserve_pages; |
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}; |
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|
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struct adjslot_list { |
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struct adjslot_list *next; |
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struct adjslot_list *prev; |
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}; |
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|
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struct proc { |
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struct adjslot_list asl; |
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int pid; |
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uid_t uid; |
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int oomadj; |
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struct proc *pidhash_next; |
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}; |
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|
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#define PIDHASH_SZ 1024 |
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static struct proc *pidhash[PIDHASH_SZ]; |
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#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1)) |
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|
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#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN) |
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static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1]; |
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|
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/* PAGE_SIZE / 1024 */ |
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static long page_k; |
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|
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/// M: Add for duraSpeed @{ |
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int duraspeed_fd = -1; |
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/// @} |
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static ssize_t read_all(int fd, char *buf, size_t max_len) |
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{ |
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ssize_t ret = 0; |
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|
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while (max_len > 0) { |
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ssize_t r = read(fd, buf, max_len); |
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if (r == 0) { |
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break; |
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} |
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if (r == -1) { |
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return -1; |
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} |
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ret += r; |
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buf += r; |
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max_len -= r; |
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} |
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|
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return ret; |
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} |
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|
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static struct proc *pid_lookup(int pid) { |
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struct proc *procp; |
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|
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for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid; |
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procp = procp->pidhash_next) |
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; |
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|
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return procp; |
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} |
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|
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static void adjslot_insert(struct adjslot_list *head, struct adjslot_list *new) |
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{ |
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struct adjslot_list *next = head->next; |
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new->prev = head; |
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new->next = next; |
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next->prev = new; |
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head->next = new; |
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} |
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|
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static void adjslot_remove(struct adjslot_list *old) |
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{ |
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struct adjslot_list *prev = old->prev; |
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struct adjslot_list *next = old->next; |
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next->prev = prev; |
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prev->next = next; |
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} |
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|
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static struct adjslot_list *adjslot_tail(struct adjslot_list *head) { |
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struct adjslot_list *asl = head->prev; |
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|
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return asl == head ? NULL : asl; |
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} |
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|
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static void proc_slot(struct proc *procp) { |
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int adjslot = ADJTOSLOT(procp->oomadj); |
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|
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adjslot_insert(&procadjslot_list[adjslot], &procp->asl); |
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} |
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|
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static void proc_unslot(struct proc *procp) { |
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adjslot_remove(&procp->asl); |
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} |
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|
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static void proc_insert(struct proc *procp) { |
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int hval = pid_hashfn(procp->pid); |
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|
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procp->pidhash_next = pidhash[hval]; |
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pidhash[hval] = procp; |
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proc_slot(procp); |
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} |
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|
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static int pid_remove(int pid) { |
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int hval = pid_hashfn(pid); |
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struct proc *procp; |
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struct proc *prevp; |
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|
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for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid; |
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procp = procp->pidhash_next) |
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prevp = procp; |
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|
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if (!procp) |
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return -1; |
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|
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if (!prevp) |
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pidhash[hval] = procp->pidhash_next; |
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else |
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prevp->pidhash_next = procp->pidhash_next; |
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|
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proc_unslot(procp); |
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free(procp); |
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return 0; |
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} |
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|
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static void writefilestring(char *path, char *s) { |
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int fd = open(path, O_WRONLY | O_CLOEXEC); |
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int len = strlen(s); |
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int ret; |
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|
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if (fd < 0) { |
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ALOGE("Error opening %s; errno=%d", path, errno); |
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return; |
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} |
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|
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ret = write(fd, s, len); |
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if (ret < 0) { |
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ALOGE("Error writing %s; errno=%d", path, errno); |
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} else if (ret < len) { |
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ALOGE("Short write on %s; length=%d", path, ret); |
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} |
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|
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close(fd); |
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} |
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|
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static void cmd_procprio(int pid, int uid, int oomadj) { |
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struct proc *procp; |
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char path[80]; |
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char val[20]; |
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int soft_limit_mult; |
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|
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if (oomadj < OOM_SCORE_ADJ_MIN || oomadj > OOM_SCORE_ADJ_MAX) { |
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ALOGE("Invalid PROCPRIO oomadj argument %d", oomadj); |
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return; |
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} |
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|
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snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", pid); |
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snprintf(val, sizeof(val), "%d", oomadj); |
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writefilestring(path, val); |
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|
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if (use_inkernel_interface) |
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return; |
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|
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if (oomadj >= 900) { |
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soft_limit_mult = 0; |
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} else if (oomadj >= 800) { |
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soft_limit_mult = 0; |
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} else if (oomadj >= 700) { |
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soft_limit_mult = 0; |
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} else if (oomadj >= 600) { |
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// Launcher should be perceptible, don't kill it. |
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oomadj = 200; |
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soft_limit_mult = 1; |
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} else if (oomadj >= 500) { |
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soft_limit_mult = 0; |
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} else if (oomadj >= 400) { |
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soft_limit_mult = 0; |
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} else if (oomadj >= 300) { |
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soft_limit_mult = 1; |
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} else if (oomadj >= 200) { |
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soft_limit_mult = 2; |
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} else if (oomadj >= 100) { |
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soft_limit_mult = 10; |
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} else if (oomadj >= 0) { |
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soft_limit_mult = 20; |
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} else { |
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// Persistent processes will have a large |
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// soft limit 512MB. |
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soft_limit_mult = 64; |
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} |
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|
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snprintf(path, sizeof(path), "/dev/memcg/apps/uid_%d/pid_%d/memory.soft_limit_in_bytes", uid, pid); |
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snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA); |
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writefilestring(path, val); |
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|
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procp = pid_lookup(pid); |
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if (!procp) { |
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procp = malloc(sizeof(struct proc)); |
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if (!procp) { |
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// Oh, the irony. May need to rebuild our state. |
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return; |
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} |
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|
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procp->pid = pid; |
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procp->uid = uid; |
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procp->oomadj = oomadj; |
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proc_insert(procp); |
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} else { |
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proc_unslot(procp); |
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procp->oomadj = oomadj; |
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proc_slot(procp); |
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} |
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} |
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|
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static void cmd_procremove(int pid) { |
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if (use_inkernel_interface) |
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return; |
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|
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pid_remove(pid); |
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} |
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|
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/* |
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* Loosen medium_oomadj by request. |
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* Only requests with higher or equal oomadj levels are allowed. |
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* level == 0, change to use default medium_oomadj |
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* level >= orig_medium_oomadj, assign level to medium_oomadj |
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* level < orig_medium_oomadj, forbidden |
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*/ |
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static void cmd_medloosen(int level) { |
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if (use_inkernel_interface) |
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return; |
|
|
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/* use default medium_oomadj */ |
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if (level == 0) { |
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medium_oomadj = orig_medium_oomadj; |
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return; |
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} |
|
|
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/* forbidden */ |
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if (level < orig_medium_oomadj) |
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return; |
|
|
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/* assign it a equal or higher value */ |
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medium_oomadj = level; |
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} |
|
|
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static void cmd_target(int ntargets, int *params) { |
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int i; |
|
|
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if (ntargets > (int)ARRAY_SIZE(lowmem_adj)) |
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return; |
|
|
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for (i = 0; i < ntargets; i++) { |
|
lowmem_minfree[i] = ntohl(*params++); |
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lowmem_adj[i] = ntohl(*params++); |
|
} |
|
|
|
lowmem_targets_size = ntargets; |
|
|
|
if (has_inkernel_module) { |
|
char minfreestr[128]; |
|
char killpriostr[128]; |
|
|
|
minfreestr[0] = '\0'; |
|
killpriostr[0] = '\0'; |
|
|
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for (i = 0; i < lowmem_targets_size; i++) { |
|
char val[40]; |
|
|
|
if (i) { |
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strlcat(minfreestr, ",", sizeof(minfreestr)); |
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strlcat(killpriostr, ",", sizeof(killpriostr)); |
|
} |
|
|
|
snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0); |
|
strlcat(minfreestr, val, sizeof(minfreestr)); |
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snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0); |
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strlcat(killpriostr, val, sizeof(killpriostr)); |
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} |
|
|
|
writefilestring(INKERNEL_MINFREE_PATH, minfreestr); |
|
writefilestring(INKERNEL_ADJ_PATH, killpriostr); |
|
} |
|
} |
|
|
|
static void ctrl_data_close(void) { |
|
ALOGI("Closing Activity Manager data connection"); |
|
close(ctrl_dfd); |
|
ctrl_dfd = -1; |
|
maxevents--; |
|
} |
|
|
|
static int ctrl_data_read(char *buf, size_t bufsz) { |
|
int ret = 0; |
|
|
|
ret = read(ctrl_dfd, buf, bufsz); |
|
|
|
if (ret == -1) { |
|
ALOGE("control data socket read failed; errno=%d", errno); |
|
} else if (ret == 0) { |
|
ALOGE("Got EOF on control data socket"); |
|
ret = -1; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void ctrl_command_handler(void) { |
|
int ibuf[CTRL_PACKET_MAX / sizeof(int)]; |
|
int len; |
|
int cmd = -1; |
|
int nargs; |
|
int targets; |
|
|
|
len = ctrl_data_read((char *)ibuf, CTRL_PACKET_MAX); |
|
if (len <= 0) |
|
return; |
|
|
|
nargs = len / sizeof(int) - 1; |
|
if (nargs < 0) |
|
goto wronglen; |
|
|
|
cmd = ntohl(ibuf[0]); |
|
|
|
switch(cmd) { |
|
case LMK_TARGET: |
|
targets = nargs / 2; |
|
if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj)) |
|
goto wronglen; |
|
cmd_target(targets, &ibuf[1]); |
|
break; |
|
case LMK_PROCPRIO: |
|
if (nargs != 3) |
|
goto wronglen; |
|
cmd_procprio(ntohl(ibuf[1]), ntohl(ibuf[2]), ntohl(ibuf[3])); |
|
break; |
|
case LMK_PROCREMOVE: |
|
if (nargs != 1) |
|
goto wronglen; |
|
cmd_procremove(ntohl(ibuf[1])); |
|
break; |
|
case LMK_MEDLOOSEN: |
|
if (nargs != 1) |
|
goto wronglen; |
|
cmd_medloosen(ntohl(ibuf[1])); |
|
break; |
|
default: |
|
ALOGE("Received unknown command code %d", cmd); |
|
return; |
|
} |
|
|
|
return; |
|
|
|
wronglen: |
|
ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len); |
|
} |
|
|
|
static void ctrl_data_handler(uint32_t events) { |
|
if (events & EPOLLHUP) { |
|
ALOGI("ActivityManager disconnected"); |
|
if (!ctrl_dfd_reopened) |
|
ctrl_data_close(); |
|
} else if (events & EPOLLIN) { |
|
ctrl_command_handler(); |
|
} |
|
} |
|
|
|
static void ctrl_connect_handler(uint32_t events __unused) { |
|
struct epoll_event epev; |
|
|
|
if (ctrl_dfd >= 0) { |
|
ctrl_data_close(); |
|
ctrl_dfd_reopened = 1; |
|
} |
|
|
|
ctrl_dfd = accept(ctrl_lfd, NULL, NULL); |
|
|
|
if (ctrl_dfd < 0) { |
|
ALOGE("lmkd control socket accept failed; errno=%d", errno); |
|
return; |
|
} |
|
|
|
ALOGI("ActivityManager connected"); |
|
maxevents++; |
|
epev.events = EPOLLIN; |
|
epev.data.ptr = (void *)ctrl_data_handler; |
|
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_dfd, &epev) == -1) { |
|
ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno); |
|
ctrl_data_close(); |
|
return; |
|
} |
|
} |
|
|
|
/// M: Add for duraSpeed @{ |
|
/** |
|
* When memory is not enough, trigger duraSpeed to handle it. |
|
* Connect to duraSpeed socket and return a socket fd which will be used |
|
* to communicate with server side. |
|
*/ |
|
static int connect_socket() { |
|
ALOGI("connect_socket start"); |
|
int fd = socket_local_client("duraspeed_memory", |
|
ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM); |
|
if(fd < 0) { |
|
ALOGE("Fail to connect to socket duraSpeedMem. return code: %d", fd); |
|
return -1; |
|
} |
|
ALOGI("connect_socket: fd = %d, end", fd); |
|
return fd; |
|
} |
|
|
|
static void trigger_duraSpeed(int level, int64_t mem_pressure) { |
|
if (duraspeed_fd < 0) { |
|
duraspeed_fd = connect_socket(); |
|
if (duraspeed_fd < 0) { |
|
return; |
|
} |
|
} |
|
|
|
int pressure = (int)mem_pressure; |
|
char buf[16]; |
|
int ret = snprintf(buf, sizeof(buf), "%d:%d\r\n", level, pressure); |
|
if (ret >= (ssize_t)sizeof(buf)) { |
|
ALOGE ("trigger duraSpeed Error, out of size"); |
|
} |
|
|
|
ssize_t written; |
|
written = write(duraspeed_fd, buf, strlen(buf) + 1); |
|
if (written < 0 && ((errno == EINTR) || (errno == EAGAIN))) { |
|
ALOGE ("trigger duraSpeed written:%zu, errno:%d", written, errno); |
|
close(duraspeed_fd); |
|
duraspeed_fd = -1; |
|
return; |
|
} |
|
} |
|
/// @} |
|
|
|
static int zoneinfo_parse_protection(char *cp) { |
|
int max = 0; |
|
int zoneval; |
|
char *save_ptr; |
|
|
|
for (cp = strtok_r(cp, "(), ", &save_ptr); cp; cp = strtok_r(NULL, "), ", &save_ptr)) { |
|
zoneval = strtol(cp, &cp, 0); |
|
if (zoneval > max) |
|
max = zoneval; |
|
} |
|
|
|
return max; |
|
} |
|
|
|
static void zoneinfo_parse_line(char *line, struct sysmeminfo *mip) { |
|
char *cp = line; |
|
char *ap; |
|
char *save_ptr; |
|
|
|
cp = strtok_r(line, " ", &save_ptr); |
|
if (!cp) |
|
return; |
|
|
|
ap = strtok_r(NULL, " ", &save_ptr); |
|
if (!ap) |
|
return; |
|
|
|
if (!strcmp(cp, "nr_free_pages")) |
|
mip->nr_free_pages += strtol(ap, NULL, 0); |
|
else if (!strcmp(cp, "nr_file_pages")) |
|
mip->nr_file_pages += strtol(ap, NULL, 0); |
|
else if (!strcmp(cp, "nr_unevictable")) |
|
mip->nr_unevictable += strtol(ap, NULL, 0); |
|
else if (!strcmp(cp, "nr_shmem")) |
|
mip->nr_shmem += strtol(ap, NULL, 0); |
|
else if (!strcmp(cp, "high")) |
|
mip->totalreserve_pages += strtol(ap, NULL, 0); |
|
else if (!strcmp(cp, "protection:")) |
|
mip->totalreserve_pages += zoneinfo_parse_protection(ap); |
|
} |
|
|
|
static int zoneinfo_parse(struct sysmeminfo *mip) { |
|
int fd; |
|
ssize_t size; |
|
char buf[PAGE_SIZE]; |
|
char *save_ptr; |
|
char *line; |
|
|
|
memset(mip, 0, sizeof(struct sysmeminfo)); |
|
|
|
fd = open(ZONEINFO_PATH, O_RDONLY | O_CLOEXEC); |
|
if (fd == -1) { |
|
ALOGE("%s open: errno=%d", ZONEINFO_PATH, errno); |
|
return -1; |
|
} |
|
|
|
size = read_all(fd, buf, sizeof(buf) - 1); |
|
if (size < 0) { |
|
ALOGE("%s read: errno=%d", ZONEINFO_PATH, errno); |
|
close(fd); |
|
return -1; |
|
} |
|
ALOG_ASSERT((size_t)size < sizeof(buf) - 1, "/proc/zoneinfo too large"); |
|
buf[size] = 0; |
|
|
|
for (line = strtok_r(buf, "\n", &save_ptr); line; line = strtok_r(NULL, "\n", &save_ptr)) |
|
zoneinfo_parse_line(line, mip); |
|
|
|
close(fd); |
|
return 0; |
|
} |
|
|
|
static int proc_get_size(int pid) { |
|
char path[PATH_MAX]; |
|
char line[LINE_MAX]; |
|
int fd; |
|
int rss = 0; |
|
int total; |
|
ssize_t ret; |
|
|
|
snprintf(path, PATH_MAX, "/proc/%d/statm", pid); |
|
fd = open(path, O_RDONLY | O_CLOEXEC); |
|
if (fd == -1) |
|
return -1; |
|
|
|
ret = read_all(fd, line, sizeof(line) - 1); |
|
if (ret < 0) { |
|
close(fd); |
|
return -1; |
|
} |
|
|
|
sscanf(line, "%d %d ", &total, &rss); |
|
close(fd); |
|
return rss; |
|
} |
|
|
|
static char *proc_get_name(int pid) { |
|
char path[PATH_MAX]; |
|
static char line[LINE_MAX]; |
|
int fd; |
|
char *cp; |
|
ssize_t ret; |
|
|
|
snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid); |
|
fd = open(path, O_RDONLY | O_CLOEXEC); |
|
if (fd == -1) |
|
return NULL; |
|
ret = read_all(fd, line, sizeof(line) - 1); |
|
close(fd); |
|
if (ret < 0) { |
|
return NULL; |
|
} |
|
|
|
cp = strchr(line, ' '); |
|
if (cp) |
|
*cp = '\0'; |
|
|
|
return line; |
|
} |
|
|
|
static struct proc *proc_adj_lru(int oomadj) { |
|
return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]); |
|
} |
|
|
|
/* Kill one process specified by procp. Returns the size of the process killed */ |
|
static int kill_one_process(struct proc* procp, int min_score_adj, bool is_critical) { |
|
int pid = procp->pid; |
|
uid_t uid = procp->uid; |
|
char *taskname; |
|
int tasksize; |
|
int r; |
|
|
|
taskname = proc_get_name(pid); |
|
if (!taskname) { |
|
pid_remove(pid); |
|
return -1; |
|
} |
|
|
|
tasksize = proc_get_size(pid); |
|
if (tasksize <= 0) { |
|
pid_remove(pid); |
|
return -1; |
|
} |
|
|
|
ALOGI( |
|
"Killing '%s' (%d), uid %d, adj %d\n" |
|
" to free %ldkB because system is under %s memory pressure oom_adj %d\n", |
|
taskname, pid, uid, procp->oomadj, tasksize * page_k, is_critical ? "critical" : "medium", |
|
min_score_adj); |
|
r = kill(pid, SIGKILL); |
|
pid_remove(pid); |
|
|
|
if (r) { |
|
ALOGE("kill(%d): errno=%d", procp->pid, errno); |
|
return -1; |
|
} else { |
|
return tasksize; |
|
} |
|
} |
|
|
|
/* |
|
* Find a process to kill based on the current (possibly estimated) free memory |
|
* and cached memory sizes. Returns the size of the killed processes. |
|
*/ |
|
static int find_and_kill_process(bool is_critical) { |
|
int i; |
|
int killed_size = 0; |
|
int min_score_adj = is_critical ? critical_oomadj : medium_oomadj; |
|
|
|
for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) { |
|
struct proc *procp; |
|
|
|
retry: |
|
procp = proc_adj_lru(i); |
|
|
|
if (procp) { |
|
killed_size = kill_one_process(procp, min_score_adj, is_critical); |
|
if (killed_size < 0) { |
|
goto retry; |
|
} else { |
|
return killed_size; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int64_t get_memory_usage(const char* path) { |
|
int ret; |
|
int64_t mem_usage; |
|
char buf[32]; |
|
int fd = open(path, O_RDONLY | O_CLOEXEC); |
|
if (fd == -1) { |
|
ALOGE("%s open: errno=%d", path, errno); |
|
return -1; |
|
} |
|
|
|
ret = read_all(fd, buf, sizeof(buf) - 1); |
|
close(fd); |
|
if (ret < 0) { |
|
ALOGE("%s error: errno=%d", path, errno); |
|
return -1; |
|
} |
|
sscanf(buf, "%" SCNd64, &mem_usage); |
|
if (mem_usage == 0) { |
|
ALOGE("No memory!"); |
|
return -1; |
|
} |
|
return mem_usage; |
|
} |
|
|
|
static void mp_event_common(bool is_critical) { |
|
int ret; |
|
unsigned long long evcount; |
|
int index = is_critical ? CRITICAL_INDEX : MEDIUM_INDEX; |
|
int64_t mem_usage, memsw_usage; |
|
int64_t mem_pressure; |
|
struct sysmeminfo zi; |
|
|
|
ret = read(mpevfd[index], &evcount, sizeof(evcount)); |
|
if (ret < 0) |
|
ALOGE("Error reading memory pressure event fd; errno=%d", |
|
errno); |
|
|
|
mem_usage = get_memory_usage(MEMCG_MEMORY_USAGE); |
|
memsw_usage = get_memory_usage(MEMCG_MEMORYSW_USAGE); |
|
if (memsw_usage < 0 || mem_usage < 0) { |
|
find_and_kill_process(is_critical); |
|
return; |
|
} |
|
|
|
// Calculate percent for swappinness. |
|
mem_pressure = (mem_usage * 100) / memsw_usage; |
|
|
|
if (enable_pressure_upgrade && !is_critical) { |
|
// We are swapping too much. |
|
if (mem_pressure < upgrade_pressure) { |
|
ALOGI("Event upgraded to critical."); |
|
is_critical = true; |
|
} |
|
} |
|
|
|
// If the pressure is larger than downgrade_pressure lmk will not |
|
// kill any process, since enough memory is available. |
|
if (mem_pressure > downgrade_pressure) { |
|
if (debug_process_killing) { |
|
ALOGI("Ignore %s memory pressure", is_critical ? "critical" : "medium"); |
|
} |
|
return; |
|
} else if (is_critical && mem_pressure > upgrade_pressure) { |
|
if (debug_process_killing) { |
|
ALOGI("Downgrade critical memory pressure"); |
|
} |
|
// Downgrade event to medium, since enough memory available. |
|
is_critical = false; |
|
} |
|
|
|
/// M: Add for duraSpeed @{ |
|
int level = 0; |
|
if (is_critical) { |
|
level = 2; |
|
} else { |
|
level = 1; |
|
} |
|
trigger_duraSpeed(level, mem_pressure); |
|
/// @} |
|
|
|
// Try to detect the case of severe I/O thrashing |
|
if (!is_critical && (zoneinfo_parse(&zi) == 0)) { |
|
int other_free = 0, other_file = 0; |
|
int minfree = 0; |
|
|
|
minfree = (lowmem_minfree[0] + CACHED_THRESHOLD) >> 1; |
|
other_file = zi.nr_file_pages - zi.nr_unevictable - zi.nr_shmem; |
|
other_free = zi.nr_free_pages - zi.totalreserve_pages; |
|
|
|
// critical case |
|
if (other_file <= minfree && other_free <= minfree) { |
|
ALOGI("File backed pages dropped to %d", minfree); |
|
is_critical = true; |
|
} |
|
} |
|
|
|
if (find_and_kill_process(is_critical) == 0) { |
|
if (debug_process_killing) { |
|
ALOGI("Nothing to kill"); |
|
} |
|
} |
|
|
|
/* Got a critical vmpressure, restore medium_oomadj */ |
|
if (is_critical) { |
|
medium_oomadj = orig_medium_oomadj; |
|
} |
|
} |
|
|
|
static void mp_event(uint32_t events __unused) { |
|
mp_event_common(false); |
|
} |
|
|
|
static void mp_event_critical(uint32_t events __unused) { |
|
mp_event_common(true); |
|
} |
|
|
|
static int init_mp_common(char *levelstr, void *event_handler, bool is_critical) |
|
{ |
|
int mpfd; |
|
int evfd; |
|
int evctlfd; |
|
char buf[256]; |
|
struct epoll_event epev; |
|
int ret; |
|
int mpevfd_index = is_critical ? CRITICAL_INDEX : MEDIUM_INDEX; |
|
|
|
mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC); |
|
if (mpfd < 0) { |
|
ALOGI("No kernel memory.pressure_level support (errno=%d)", errno); |
|
goto err_open_mpfd; |
|
} |
|
|
|
evctlfd = open(MEMCG_SYSFS_PATH "cgroup.event_control", O_WRONLY | O_CLOEXEC); |
|
if (evctlfd < 0) { |
|
ALOGI("No kernel memory cgroup event control (errno=%d)", errno); |
|
goto err_open_evctlfd; |
|
} |
|
|
|
evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); |
|
if (evfd < 0) { |
|
ALOGE("eventfd failed for level %s; errno=%d", levelstr, errno); |
|
goto err_eventfd; |
|
} |
|
|
|
ret = snprintf(buf, sizeof(buf), "%d %d %s", evfd, mpfd, levelstr); |
|
if (ret >= (ssize_t)sizeof(buf)) { |
|
ALOGE("cgroup.event_control line overflow for level %s", levelstr); |
|
goto err; |
|
} |
|
|
|
ret = write(evctlfd, buf, strlen(buf) + 1); |
|
if (ret == -1) { |
|
ALOGE("cgroup.event_control write failed for level %s; errno=%d", |
|
levelstr, errno); |
|
goto err; |
|
} |
|
|
|
epev.events = EPOLLIN; |
|
epev.data.ptr = event_handler; |
|
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, evfd, &epev); |
|
if (ret == -1) { |
|
ALOGE("epoll_ctl for level %s failed; errno=%d", levelstr, errno); |
|
goto err; |
|
} |
|
maxevents++; |
|
mpevfd[mpevfd_index] = evfd; |
|
return 0; |
|
|
|
err: |
|
close(evfd); |
|
err_eventfd: |
|
close(evctlfd); |
|
err_open_evctlfd: |
|
close(mpfd); |
|
err_open_mpfd: |
|
return -1; |
|
} |
|
|
|
static int init_mp_medium() |
|
{ |
|
return init_mp_common(MEMPRESSURE_WATCH_MEDIUM_LEVEL, (void *)&mp_event, false); |
|
} |
|
|
|
static int init_mp_critical() |
|
{ |
|
return init_mp_common(MEMPRESSURE_WATCH_CRITICAL_LEVEL, (void *)&mp_event_critical, true); |
|
} |
|
|
|
static int init(void) { |
|
struct epoll_event epev; |
|
int i; |
|
int ret; |
|
|
|
page_k = sysconf(_SC_PAGESIZE); |
|
if (page_k == -1) |
|
page_k = PAGE_SIZE; |
|
page_k /= 1024; |
|
|
|
epollfd = epoll_create(MAX_EPOLL_EVENTS); |
|
if (epollfd == -1) { |
|
ALOGE("epoll_create failed (errno=%d)", errno); |
|
return -1; |
|
} |
|
|
|
ctrl_lfd = android_get_control_socket("lmkd"); |
|
if (ctrl_lfd < 0) { |
|
ALOGE("get lmkd control socket failed"); |
|
return -1; |
|
} |
|
|
|
ret = listen(ctrl_lfd, 1); |
|
if (ret < 0) { |
|
ALOGE("lmkd control socket listen failed (errno=%d)", errno); |
|
return -1; |
|
} |
|
|
|
epev.events = EPOLLIN; |
|
epev.data.ptr = (void *)ctrl_connect_handler; |
|
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_lfd, &epev) == -1) { |
|
ALOGE("epoll_ctl for lmkd control socket failed (errno=%d)", errno); |
|
return -1; |
|
} |
|
maxevents++; |
|
|
|
has_inkernel_module = !access(INKERNEL_MINFREE_PATH, W_OK); |
|
use_inkernel_interface = has_inkernel_module && !is_go_device; |
|
|
|
if (use_inkernel_interface) { |
|
ALOGI("Using in-kernel low memory killer interface"); |
|
} else { |
|
ret = init_mp_medium(); |
|
ret |= init_mp_critical(); |
|
if (ret) |
|
ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer"); |
|
} |
|
|
|
for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) { |
|
procadjslot_list[i].next = &procadjslot_list[i]; |
|
procadjslot_list[i].prev = &procadjslot_list[i]; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void mainloop(void) { |
|
while (1) { |
|
struct epoll_event events[maxevents]; |
|
int nevents; |
|
int i; |
|
|
|
ctrl_dfd_reopened = 0; |
|
nevents = epoll_wait(epollfd, events, maxevents, -1); |
|
|
|
if (nevents == -1) { |
|
if (errno == EINTR) |
|
continue; |
|
ALOGE("epoll_wait failed (errno=%d)", errno); |
|
continue; |
|
} |
|
|
|
for (i = 0; i < nevents; ++i) { |
|
if (events[i].events & EPOLLERR) |
|
ALOGD("EPOLLERR on event #%d", i); |
|
if (events[i].data.ptr) |
|
(*(void (*)(uint32_t))events[i].data.ptr)(events[i].events); |
|
} |
|
} |
|
} |
|
|
|
int main(int argc __unused, char **argv) { |
|
struct sched_param param = { |
|
.sched_priority = 1, |
|
}; |
|
|
|
if (!getenv("LMKD_RE_EXEC")) { |
|
if (setenv("LMKD_RE_EXEC", "1", 1)) { |
|
abort(); |
|
} |
|
struct rlimit rlimit_stack = { |
|
.rlim_cur = 64 * 1024, |
|
.rlim_max = 64 * 1024, |
|
}; |
|
if (setrlimit(RLIMIT_STACK, &rlimit_stack)) { |
|
abort(); |
|
} |
|
execvp(argv[0], argv); |
|
abort(); |
|
} |
|
ALOGI("running re-execed"); |
|
|
|
medium_oomadj = property_get_int32("ro.lmk.medium", 800); |
|
orig_medium_oomadj = medium_oomadj; |
|
critical_oomadj = property_get_int32("ro.lmk.critical", 0); |
|
debug_process_killing = property_get_bool("ro.lmk.debug", false); |
|
enable_pressure_upgrade = property_get_bool("ro.lmk.critical_upgrade", false); |
|
upgrade_pressure = (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 50); |
|
downgrade_pressure = (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 60); |
|
is_go_device = property_get_bool("ro.config.low_ram", false); |
|
|
|
mlockall(MCL_FUTURE); |
|
sched_setscheduler(0, SCHED_FIFO, ¶m); |
|
if (!init()) |
|
mainloop(); |
|
|
|
ALOGI("exiting"); |
|
return 0; |
|
}
|
|
|