f81b5f44d8
find_and_kill_processes() does not kill multiple processes at a time anymore. Remove support for bulk process killing. Change-Id: Id09132a9cebe44589a1a3ebcbff800a16fa56557 Signed-off-by: Suren Baghdasaryan <surenb@google.com>
1937 lines
54 KiB
C
1937 lines
54 KiB
C
/*
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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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#define LOG_TAG "lowmemorykiller"
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#include <errno.h>
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#include <inttypes.h>
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#include <pwd.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdbool.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/sysinfo.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <cutils/properties.h>
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#include <cutils/sockets.h>
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#include <lmkd.h>
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#include <log/log.h>
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#include <log/log_event_list.h>
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#include <log/log_time.h>
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#ifdef LMKD_LOG_STATS
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#include "statslog.h"
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#endif
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/*
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* Define LMKD_TRACE_KILLS to record lmkd kills in kernel traces
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* to profile and correlate with OOM kills
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*/
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#ifdef LMKD_TRACE_KILLS
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#define ATRACE_TAG ATRACE_TAG_ALWAYS
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#include <cutils/trace.h>
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#define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid);
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#define TRACE_KILL_END() ATRACE_INT(__FUNCTION__, 0);
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#else /* LMKD_TRACE_KILLS */
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#define TRACE_KILL_START(pid) ((void)(pid))
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#define TRACE_KILL_END() ((void)0)
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#endif /* LMKD_TRACE_KILLS */
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#ifndef __unused
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#define __unused __attribute__((__unused__))
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#endif
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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 ZONEINFO_PATH "/proc/zoneinfo"
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#define MEMINFO_PATH "/proc/meminfo"
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#define LINE_MAX 128
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/* Android Logger event logtags (see event.logtags) */
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#define MEMINFO_LOG_TAG 10195355
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/* gid containing AID_SYSTEM required */
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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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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
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#define EIGHT_MEGA (1 << 23)
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#define TARGET_UPDATE_MIN_INTERVAL_MS 1000
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#define NS_PER_MS (NS_PER_SEC / MS_PER_SEC)
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/* Defined as ProcessList.SYSTEM_ADJ in ProcessList.java */
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#define SYSTEM_ADJ (-900)
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#define STRINGIFY(x) STRINGIFY_INTERNAL(x)
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#define STRINGIFY_INTERNAL(x) #x
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#define min(a, b) (((a) < (b)) ? (a) : (b))
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#define FAIL_REPORT_RLIMIT_MS 1000
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/* default to old in-kernel interface if no memory pressure events */
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static bool use_inkernel_interface = true;
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static bool has_inkernel_module;
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/* memory pressure levels */
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enum vmpressure_level {
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VMPRESS_LEVEL_LOW = 0,
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VMPRESS_LEVEL_MEDIUM,
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VMPRESS_LEVEL_CRITICAL,
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VMPRESS_LEVEL_COUNT
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};
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static const char *level_name[] = {
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"low",
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"medium",
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"critical"
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};
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struct {
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int64_t min_nr_free_pages; /* recorded but not used yet */
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int64_t max_nr_free_pages;
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} low_pressure_mem = { -1, -1 };
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static int level_oomadj[VMPRESS_LEVEL_COUNT];
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static int mpevfd[VMPRESS_LEVEL_COUNT] = { -1, -1, -1 };
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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 low_ram_device;
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static bool kill_heaviest_task;
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static unsigned long kill_timeout_ms;
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static bool use_minfree_levels;
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static bool per_app_memcg;
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static int swap_free_low_percentage;
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static android_log_context ctx;
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/* data required to handle events */
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struct event_handler_info {
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int data;
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void (*handler)(int data, uint32_t events);
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};
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/* data required to handle socket events */
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struct sock_event_handler_info {
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int sock;
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struct event_handler_info handler_info;
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};
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/* max supported number of data connections */
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#define MAX_DATA_CONN 2
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/* socket event handler data */
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static struct sock_event_handler_info ctrl_sock;
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static struct sock_event_handler_info data_sock[MAX_DATA_CONN];
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/* vmpressure event handler data */
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static struct event_handler_info vmpressure_hinfo[VMPRESS_LEVEL_COUNT];
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/* 3 memory pressure levels, 1 ctrl listen socket, 2 ctrl data socket */
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#define MAX_EPOLL_EVENTS (1 + MAX_DATA_CONN + VMPRESS_LEVEL_COUNT)
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static int epollfd;
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static int maxevents;
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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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static int lowmem_adj[MAX_TARGETS];
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static int lowmem_minfree[MAX_TARGETS];
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static int lowmem_targets_size;
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/* Fields to parse in /proc/zoneinfo */
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enum zoneinfo_field {
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ZI_NR_FREE_PAGES = 0,
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ZI_NR_FILE_PAGES,
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ZI_NR_SHMEM,
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ZI_NR_UNEVICTABLE,
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ZI_WORKINGSET_REFAULT,
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ZI_HIGH,
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ZI_FIELD_COUNT
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};
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static const char* const zoneinfo_field_names[ZI_FIELD_COUNT] = {
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"nr_free_pages",
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"nr_file_pages",
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"nr_shmem",
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"nr_unevictable",
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"workingset_refault",
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"high",
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};
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union zoneinfo {
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struct {
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int64_t nr_free_pages;
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int64_t nr_file_pages;
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int64_t nr_shmem;
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int64_t nr_unevictable;
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int64_t workingset_refault;
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int64_t high;
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/* fields below are calculated rather than read from the file */
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int64_t totalreserve_pages;
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} field;
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int64_t arr[ZI_FIELD_COUNT];
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};
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/* Fields to parse in /proc/meminfo */
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enum meminfo_field {
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MI_NR_FREE_PAGES = 0,
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MI_CACHED,
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MI_SWAP_CACHED,
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MI_BUFFERS,
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MI_SHMEM,
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MI_UNEVICTABLE,
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MI_TOTAL_SWAP,
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MI_FREE_SWAP,
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MI_ACTIVE_ANON,
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MI_INACTIVE_ANON,
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MI_ACTIVE_FILE,
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MI_INACTIVE_FILE,
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MI_SRECLAIMABLE,
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MI_SUNRECLAIM,
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MI_KERNEL_STACK,
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MI_PAGE_TABLES,
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MI_ION_HELP,
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MI_ION_HELP_POOL,
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MI_CMA_FREE,
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MI_FIELD_COUNT
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};
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static const char* const meminfo_field_names[MI_FIELD_COUNT] = {
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"MemFree:",
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"Cached:",
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"SwapCached:",
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"Buffers:",
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"Shmem:",
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"Unevictable:",
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"SwapTotal:",
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"SwapFree:",
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"Active(anon):",
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"Inactive(anon):",
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"Active(file):",
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"Inactive(file):",
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"SReclaimable:",
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"SUnreclaim:",
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"KernelStack:",
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"PageTables:",
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"ION_heap:",
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"ION_heap_pool:",
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"CmaFree:",
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};
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union meminfo {
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struct {
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int64_t nr_free_pages;
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int64_t cached;
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int64_t swap_cached;
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int64_t buffers;
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int64_t shmem;
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int64_t unevictable;
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int64_t total_swap;
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int64_t free_swap;
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int64_t active_anon;
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int64_t inactive_anon;
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int64_t active_file;
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int64_t inactive_file;
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int64_t sreclaimable;
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int64_t sunreclaimable;
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int64_t kernel_stack;
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int64_t page_tables;
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int64_t ion_heap;
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int64_t ion_heap_pool;
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int64_t cma_free;
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/* fields below are calculated rather than read from the file */
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int64_t nr_file_pages;
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} field;
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int64_t arr[MI_FIELD_COUNT];
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};
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enum field_match_result {
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NO_MATCH,
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PARSE_FAIL,
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PARSE_SUCCESS
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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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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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struct reread_data {
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const char* const filename;
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int fd;
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};
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#ifdef LMKD_LOG_STATS
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static bool enable_stats_log;
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static android_log_context log_ctx;
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#endif
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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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#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN)
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#define ADJTOSLOT_COUNT (ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1)
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static struct adjslot_list procadjslot_list[ADJTOSLOT_COUNT];
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#define MAX_DISTINCT_OOM_ADJ 32
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#define KILLCNT_INVALID_IDX 0xFF
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/*
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* Because killcnt array is sparse a two-level indirection is used
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* to keep the size small. killcnt_idx stores index of the element in
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* killcnt array. Index KILLCNT_INVALID_IDX indicates an unused slot.
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*/
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static uint8_t killcnt_idx[ADJTOSLOT_COUNT];
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static uint16_t killcnt[MAX_DISTINCT_OOM_ADJ];
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static int killcnt_free_idx = 0;
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static uint32_t killcnt_total = 0;
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/* PAGE_SIZE / 1024 */
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static long page_k;
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static bool parse_int64(const char* str, int64_t* ret) {
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char* endptr;
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long long val = strtoll(str, &endptr, 10);
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if (str == endptr || val > INT64_MAX) {
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return false;
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}
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*ret = (int64_t)val;
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return true;
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}
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static enum field_match_result match_field(const char* cp, const char* ap,
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const char* const field_names[],
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int field_count, int64_t* field,
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int *field_idx) {
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int64_t val;
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int i;
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for (i = 0; i < field_count; i++) {
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if (!strcmp(cp, field_names[i])) {
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*field_idx = i;
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return parse_int64(ap, field) ? PARSE_SUCCESS : PARSE_FAIL;
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}
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}
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return NO_MATCH;
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}
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/*
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* Read file content from the beginning up to max_len bytes or EOF
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* whichever happens first.
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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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off_t offset = 0;
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while (max_len > 0) {
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ssize_t r = TEMP_FAILURE_RETRY(pread(fd, buf, max_len, offset));
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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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offset += r;
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max_len -= r;
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}
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return ret;
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}
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/*
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* Read a new or already opened file from the beginning.
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* If the file has not been opened yet data->fd should be set to -1.
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* To be used with files which are read often and possibly during high
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* memory pressure to minimize file opening which by itself requires kernel
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* memory allocation and might result in a stall on memory stressed system.
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*/
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static int reread_file(struct reread_data *data, char *buf, size_t buf_size) {
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ssize_t size;
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if (data->fd == -1) {
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data->fd = open(data->filename, O_RDONLY | O_CLOEXEC);
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if (data->fd == -1) {
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ALOGE("%s open: %s", data->filename, strerror(errno));
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return -1;
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}
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}
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size = read_all(data->fd, buf, buf_size - 1);
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if (size < 0) {
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ALOGE("%s read: %s", data->filename, strerror(errno));
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close(data->fd);
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data->fd = -1;
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return -1;
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}
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ALOG_ASSERT((size_t)size < buf_size - 1, "%s too large", data->filename);
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buf[size] = 0;
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return 0;
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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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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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return procp;
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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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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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static struct adjslot_list *adjslot_tail(struct adjslot_list *head) {
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struct adjslot_list *asl = head->prev;
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return asl == head ? NULL : asl;
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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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adjslot_insert(&procadjslot_list[adjslot], &procp->asl);
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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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static void proc_insert(struct proc *procp) {
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int hval = pid_hashfn(procp->pid);
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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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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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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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if (!procp)
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return -1;
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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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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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* Write a string to a file.
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* Returns false if the file does not exist.
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*/
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static bool writefilestring(const char *path, const char *s,
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bool err_if_missing) {
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int fd = open(path, O_WRONLY | O_CLOEXEC);
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ssize_t len = strlen(s);
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ssize_t ret;
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if (fd < 0) {
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if (err_if_missing) {
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ALOGE("Error opening %s; errno=%d", path, errno);
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}
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return false;
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}
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ret = TEMP_FAILURE_RETRY(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=%zd", path, ret);
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}
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close(fd);
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return true;
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}
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static inline long get_time_diff_ms(struct timespec *from,
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struct timespec *to) {
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return (to->tv_sec - from->tv_sec) * (long)MS_PER_SEC +
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(to->tv_nsec - from->tv_nsec) / (long)NS_PER_MS;
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}
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static void cmd_procprio(LMKD_CTRL_PACKET packet) {
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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;
|
|
struct lmk_procprio params;
|
|
bool is_system_server;
|
|
struct passwd *pwdrec;
|
|
|
|
lmkd_pack_get_procprio(packet, ¶ms);
|
|
|
|
if (params.oomadj < OOM_SCORE_ADJ_MIN ||
|
|
params.oomadj > OOM_SCORE_ADJ_MAX) {
|
|
ALOGE("Invalid PROCPRIO oomadj argument %d", params.oomadj);
|
|
return;
|
|
}
|
|
|
|
/* gid containing AID_READPROC required */
|
|
/* CAP_SYS_RESOURCE required */
|
|
/* CAP_DAC_OVERRIDE required */
|
|
snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", params.pid);
|
|
snprintf(val, sizeof(val), "%d", params.oomadj);
|
|
if (!writefilestring(path, val, false)) {
|
|
ALOGW("Failed to open %s; errno=%d: process %d might have been killed",
|
|
path, errno, params.pid);
|
|
/* If this file does not exist the process is dead. */
|
|
return;
|
|
}
|
|
|
|
if (use_inkernel_interface) {
|
|
return;
|
|
}
|
|
|
|
if (per_app_memcg) {
|
|
if (params.oomadj >= 900) {
|
|
soft_limit_mult = 0;
|
|
} else if (params.oomadj >= 800) {
|
|
soft_limit_mult = 0;
|
|
} else if (params.oomadj >= 700) {
|
|
soft_limit_mult = 0;
|
|
} else if (params.oomadj >= 600) {
|
|
// Launcher should be perceptible, don't kill it.
|
|
params.oomadj = 200;
|
|
soft_limit_mult = 1;
|
|
} else if (params.oomadj >= 500) {
|
|
soft_limit_mult = 0;
|
|
} else if (params.oomadj >= 400) {
|
|
soft_limit_mult = 0;
|
|
} else if (params.oomadj >= 300) {
|
|
soft_limit_mult = 1;
|
|
} else if (params.oomadj >= 200) {
|
|
soft_limit_mult = 8;
|
|
} else if (params.oomadj >= 100) {
|
|
soft_limit_mult = 10;
|
|
} else if (params.oomadj >= 0) {
|
|
soft_limit_mult = 20;
|
|
} else {
|
|
// Persistent processes will have a large
|
|
// soft limit 512MB.
|
|
soft_limit_mult = 64;
|
|
}
|
|
|
|
snprintf(path, sizeof(path), MEMCG_SYSFS_PATH
|
|
"apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
|
|
params.uid, params.pid);
|
|
snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
|
|
|
|
/*
|
|
* system_server process has no memcg under /dev/memcg/apps but should be
|
|
* registered with lmkd. This is the best way so far to identify it.
|
|
*/
|
|
is_system_server = (params.oomadj == SYSTEM_ADJ &&
|
|
(pwdrec = getpwnam("system")) != NULL &&
|
|
params.uid == pwdrec->pw_uid);
|
|
writefilestring(path, val, !is_system_server);
|
|
}
|
|
|
|
procp = pid_lookup(params.pid);
|
|
if (!procp) {
|
|
procp = malloc(sizeof(struct proc));
|
|
if (!procp) {
|
|
// Oh, the irony. May need to rebuild our state.
|
|
return;
|
|
}
|
|
|
|
procp->pid = params.pid;
|
|
procp->uid = params.uid;
|
|
procp->oomadj = params.oomadj;
|
|
proc_insert(procp);
|
|
} else {
|
|
proc_unslot(procp);
|
|
procp->oomadj = params.oomadj;
|
|
proc_slot(procp);
|
|
}
|
|
}
|
|
|
|
static void cmd_procremove(LMKD_CTRL_PACKET packet) {
|
|
struct lmk_procremove params;
|
|
|
|
if (use_inkernel_interface) {
|
|
return;
|
|
}
|
|
|
|
lmkd_pack_get_procremove(packet, ¶ms);
|
|
/*
|
|
* WARNING: After pid_remove() procp is freed and can't be used!
|
|
* Therefore placed at the end of the function.
|
|
*/
|
|
pid_remove(params.pid);
|
|
}
|
|
|
|
static void cmd_procpurge() {
|
|
int i;
|
|
struct proc *procp;
|
|
struct proc *next;
|
|
|
|
if (use_inkernel_interface) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
|
|
procadjslot_list[i].next = &procadjslot_list[i];
|
|
procadjslot_list[i].prev = &procadjslot_list[i];
|
|
}
|
|
|
|
for (i = 0; i < PIDHASH_SZ; i++) {
|
|
procp = pidhash[i];
|
|
while (procp) {
|
|
next = procp->pidhash_next;
|
|
free(procp);
|
|
procp = next;
|
|
}
|
|
}
|
|
memset(&pidhash[0], 0, sizeof(pidhash));
|
|
}
|
|
|
|
static void inc_killcnt(int oomadj) {
|
|
int slot = ADJTOSLOT(oomadj);
|
|
uint8_t idx = killcnt_idx[slot];
|
|
|
|
if (idx == KILLCNT_INVALID_IDX) {
|
|
/* index is not assigned for this oomadj */
|
|
if (killcnt_free_idx < MAX_DISTINCT_OOM_ADJ) {
|
|
killcnt_idx[slot] = killcnt_free_idx;
|
|
killcnt[killcnt_free_idx] = 1;
|
|
killcnt_free_idx++;
|
|
} else {
|
|
ALOGW("Number of distinct oomadj levels exceeds %d",
|
|
MAX_DISTINCT_OOM_ADJ);
|
|
}
|
|
} else {
|
|
/*
|
|
* wraparound is highly unlikely and is detectable using total
|
|
* counter because it has to be equal to the sum of all counters
|
|
*/
|
|
killcnt[idx]++;
|
|
}
|
|
/* increment total kill counter */
|
|
killcnt_total++;
|
|
}
|
|
|
|
static int get_killcnt(int min_oomadj, int max_oomadj) {
|
|
int slot;
|
|
int count = 0;
|
|
|
|
if (min_oomadj > max_oomadj)
|
|
return 0;
|
|
|
|
/* special case to get total kill count */
|
|
if (min_oomadj > OOM_SCORE_ADJ_MAX)
|
|
return killcnt_total;
|
|
|
|
while (min_oomadj <= max_oomadj &&
|
|
(slot = ADJTOSLOT(min_oomadj)) < ADJTOSLOT_COUNT) {
|
|
uint8_t idx = killcnt_idx[slot];
|
|
if (idx != KILLCNT_INVALID_IDX) {
|
|
count += killcnt[idx];
|
|
}
|
|
min_oomadj++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static int cmd_getkillcnt(LMKD_CTRL_PACKET packet) {
|
|
struct lmk_getkillcnt params;
|
|
|
|
if (use_inkernel_interface) {
|
|
/* kernel driver does not expose this information */
|
|
return 0;
|
|
}
|
|
|
|
lmkd_pack_get_getkillcnt(packet, ¶ms);
|
|
|
|
return get_killcnt(params.min_oomadj, params.max_oomadj);
|
|
}
|
|
|
|
static void cmd_target(int ntargets, LMKD_CTRL_PACKET packet) {
|
|
int i;
|
|
struct lmk_target target;
|
|
char minfree_str[PROPERTY_VALUE_MAX];
|
|
char *pstr = minfree_str;
|
|
char *pend = minfree_str + sizeof(minfree_str);
|
|
static struct timespec last_req_tm;
|
|
struct timespec curr_tm;
|
|
|
|
if (ntargets < 1 || ntargets > (int)ARRAY_SIZE(lowmem_adj))
|
|
return;
|
|
|
|
/*
|
|
* Ratelimit minfree updates to once per TARGET_UPDATE_MIN_INTERVAL_MS
|
|
* to prevent DoS attacks
|
|
*/
|
|
if (clock_gettime(CLOCK_MONOTONIC_COARSE, &curr_tm) != 0) {
|
|
ALOGE("Failed to get current time");
|
|
return;
|
|
}
|
|
|
|
if (get_time_diff_ms(&last_req_tm, &curr_tm) <
|
|
TARGET_UPDATE_MIN_INTERVAL_MS) {
|
|
ALOGE("Ignoring frequent updated to lmkd limits");
|
|
return;
|
|
}
|
|
|
|
last_req_tm = curr_tm;
|
|
|
|
for (i = 0; i < ntargets; i++) {
|
|
lmkd_pack_get_target(packet, i, &target);
|
|
lowmem_minfree[i] = target.minfree;
|
|
lowmem_adj[i] = target.oom_adj_score;
|
|
|
|
pstr += snprintf(pstr, pend - pstr, "%d:%d,", target.minfree,
|
|
target.oom_adj_score);
|
|
if (pstr >= pend) {
|
|
/* if no more space in the buffer then terminate the loop */
|
|
pstr = pend;
|
|
break;
|
|
}
|
|
}
|
|
|
|
lowmem_targets_size = ntargets;
|
|
|
|
/* Override the last extra comma */
|
|
pstr[-1] = '\0';
|
|
property_set("sys.lmk.minfree_levels", minfree_str);
|
|
|
|
if (has_inkernel_module) {
|
|
char minfreestr[128];
|
|
char killpriostr[128];
|
|
|
|
minfreestr[0] = '\0';
|
|
killpriostr[0] = '\0';
|
|
|
|
for (i = 0; i < lowmem_targets_size; i++) {
|
|
char val[40];
|
|
|
|
if (i) {
|
|
strlcat(minfreestr, ",", sizeof(minfreestr));
|
|
strlcat(killpriostr, ",", sizeof(killpriostr));
|
|
}
|
|
|
|
snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_minfree[i] : 0);
|
|
strlcat(minfreestr, val, sizeof(minfreestr));
|
|
snprintf(val, sizeof(val), "%d", use_inkernel_interface ? lowmem_adj[i] : 0);
|
|
strlcat(killpriostr, val, sizeof(killpriostr));
|
|
}
|
|
|
|
writefilestring(INKERNEL_MINFREE_PATH, minfreestr, true);
|
|
writefilestring(INKERNEL_ADJ_PATH, killpriostr, true);
|
|
}
|
|
}
|
|
|
|
static void ctrl_data_close(int dsock_idx) {
|
|
struct epoll_event epev;
|
|
|
|
ALOGI("closing lmkd data connection");
|
|
if (epoll_ctl(epollfd, EPOLL_CTL_DEL, data_sock[dsock_idx].sock, &epev) == -1) {
|
|
// Log a warning and keep going
|
|
ALOGW("epoll_ctl for data connection socket failed; errno=%d", errno);
|
|
}
|
|
maxevents--;
|
|
|
|
close(data_sock[dsock_idx].sock);
|
|
data_sock[dsock_idx].sock = -1;
|
|
}
|
|
|
|
static int ctrl_data_read(int dsock_idx, char *buf, size_t bufsz) {
|
|
int ret = 0;
|
|
|
|
ret = TEMP_FAILURE_RETRY(read(data_sock[dsock_idx].sock, 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 int ctrl_data_write(int dsock_idx, char *buf, size_t bufsz) {
|
|
int ret = 0;
|
|
|
|
ret = TEMP_FAILURE_RETRY(write(data_sock[dsock_idx].sock, buf, bufsz));
|
|
|
|
if (ret == -1) {
|
|
ALOGE("control data socket write failed; errno=%d", errno);
|
|
} else if (ret == 0) {
|
|
ALOGE("Got EOF on control data socket");
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ctrl_command_handler(int dsock_idx) {
|
|
LMKD_CTRL_PACKET packet;
|
|
int len;
|
|
enum lmk_cmd cmd;
|
|
int nargs;
|
|
int targets;
|
|
int kill_cnt;
|
|
|
|
len = ctrl_data_read(dsock_idx, (char *)packet, CTRL_PACKET_MAX_SIZE);
|
|
if (len <= 0)
|
|
return;
|
|
|
|
if (len < (int)sizeof(int)) {
|
|
ALOGE("Wrong control socket read length len=%d", len);
|
|
return;
|
|
}
|
|
|
|
cmd = lmkd_pack_get_cmd(packet);
|
|
nargs = len / sizeof(int) - 1;
|
|
if (nargs < 0)
|
|
goto wronglen;
|
|
|
|
switch(cmd) {
|
|
case LMK_TARGET:
|
|
targets = nargs / 2;
|
|
if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj))
|
|
goto wronglen;
|
|
cmd_target(targets, packet);
|
|
break;
|
|
case LMK_PROCPRIO:
|
|
if (nargs != 3)
|
|
goto wronglen;
|
|
cmd_procprio(packet);
|
|
break;
|
|
case LMK_PROCREMOVE:
|
|
if (nargs != 1)
|
|
goto wronglen;
|
|
cmd_procremove(packet);
|
|
break;
|
|
case LMK_PROCPURGE:
|
|
if (nargs != 0)
|
|
goto wronglen;
|
|
cmd_procpurge();
|
|
break;
|
|
case LMK_GETKILLCNT:
|
|
if (nargs != 2)
|
|
goto wronglen;
|
|
kill_cnt = cmd_getkillcnt(packet);
|
|
len = lmkd_pack_set_getkillcnt_repl(packet, kill_cnt);
|
|
if (ctrl_data_write(dsock_idx, (char *)packet, len) != len)
|
|
return;
|
|
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(int data, uint32_t events) {
|
|
if (events & EPOLLIN) {
|
|
ctrl_command_handler(data);
|
|
}
|
|
}
|
|
|
|
static int get_free_dsock() {
|
|
for (int i = 0; i < MAX_DATA_CONN; i++) {
|
|
if (data_sock[i].sock < 0) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void ctrl_connect_handler(int data __unused, uint32_t events __unused) {
|
|
struct epoll_event epev;
|
|
int free_dscock_idx = get_free_dsock();
|
|
|
|
if (free_dscock_idx < 0) {
|
|
/*
|
|
* Number of data connections exceeded max supported. This should not
|
|
* happen but if it does we drop all existing connections and accept
|
|
* the new one. This prevents inactive connections from monopolizing
|
|
* data socket and if we drop ActivityManager connection it will
|
|
* immediately reconnect.
|
|
*/
|
|
for (int i = 0; i < MAX_DATA_CONN; i++) {
|
|
ctrl_data_close(i);
|
|
}
|
|
free_dscock_idx = 0;
|
|
}
|
|
|
|
data_sock[free_dscock_idx].sock = accept(ctrl_sock.sock, NULL, NULL);
|
|
if (data_sock[free_dscock_idx].sock < 0) {
|
|
ALOGE("lmkd control socket accept failed; errno=%d", errno);
|
|
return;
|
|
}
|
|
|
|
ALOGI("lmkd data connection established");
|
|
/* use data to store data connection idx */
|
|
data_sock[free_dscock_idx].handler_info.data = free_dscock_idx;
|
|
data_sock[free_dscock_idx].handler_info.handler = ctrl_data_handler;
|
|
epev.events = EPOLLIN;
|
|
epev.data.ptr = (void *)&(data_sock[free_dscock_idx].handler_info);
|
|
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, data_sock[free_dscock_idx].sock, &epev) == -1) {
|
|
ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno);
|
|
ctrl_data_close(free_dscock_idx);
|
|
return;
|
|
}
|
|
maxevents++;
|
|
}
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
static void memory_stat_parse_line(char* line, struct memory_stat* mem_st) {
|
|
char key[LINE_MAX + 1];
|
|
int64_t value;
|
|
|
|
sscanf(line, "%" STRINGIFY(LINE_MAX) "s %" SCNd64 "", key, &value);
|
|
|
|
if (strcmp(key, "total_") < 0) {
|
|
return;
|
|
}
|
|
|
|
if (!strcmp(key, "total_pgfault"))
|
|
mem_st->pgfault = value;
|
|
else if (!strcmp(key, "total_pgmajfault"))
|
|
mem_st->pgmajfault = value;
|
|
else if (!strcmp(key, "total_rss"))
|
|
mem_st->rss_in_bytes = value;
|
|
else if (!strcmp(key, "total_cache"))
|
|
mem_st->cache_in_bytes = value;
|
|
else if (!strcmp(key, "total_swap"))
|
|
mem_st->swap_in_bytes = value;
|
|
}
|
|
|
|
static int memory_stat_from_cgroup(struct memory_stat* mem_st, int pid, uid_t uid) {
|
|
FILE *fp;
|
|
char buf[PATH_MAX];
|
|
|
|
snprintf(buf, sizeof(buf), MEMCG_PROCESS_MEMORY_STAT_PATH, uid, pid);
|
|
|
|
fp = fopen(buf, "r");
|
|
|
|
if (fp == NULL) {
|
|
ALOGE("%s open failed: %s", buf, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
while (fgets(buf, PAGE_SIZE, fp) != NULL) {
|
|
memory_stat_parse_line(buf, mem_st);
|
|
}
|
|
fclose(fp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int memory_stat_from_procfs(struct memory_stat* mem_st, int pid) {
|
|
char path[PATH_MAX];
|
|
char buffer[PROC_STAT_BUFFER_SIZE];
|
|
int fd, ret;
|
|
|
|
snprintf(path, sizeof(path), PROC_STAT_FILE_PATH, pid);
|
|
if ((fd = open(path, O_RDONLY | O_CLOEXEC)) < 0) {
|
|
ALOGE("%s open failed: %s", path, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
ret = read(fd, buffer, sizeof(buffer));
|
|
if (ret < 0) {
|
|
ALOGE("%s read failed: %s", path, strerror(errno));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
close(fd);
|
|
|
|
// field 10 is pgfault
|
|
// field 12 is pgmajfault
|
|
// field 24 is rss_in_pages
|
|
int64_t pgfault = 0, pgmajfault = 0, rss_in_pages = 0;
|
|
if (sscanf(buffer,
|
|
"%*u %*s %*s %*d %*d %*d %*d %*d %*d %" SCNd64 " %*d "
|
|
"%" SCNd64 " %*d %*u %*u %*d %*d %*d %*d %*d %*d "
|
|
"%*d %*d %" SCNd64 "",
|
|
&pgfault, &pgmajfault, &rss_in_pages) != 3) {
|
|
return -1;
|
|
}
|
|
mem_st->pgfault = pgfault;
|
|
mem_st->pgmajfault = pgmajfault;
|
|
mem_st->rss_in_bytes = (rss_in_pages * PAGE_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* /prop/zoneinfo parsing routines */
|
|
static int64_t zoneinfo_parse_protection(char *cp) {
|
|
int64_t max = 0;
|
|
long long zoneval;
|
|
char *save_ptr;
|
|
|
|
for (cp = strtok_r(cp, "(), ", &save_ptr); cp;
|
|
cp = strtok_r(NULL, "), ", &save_ptr)) {
|
|
zoneval = strtoll(cp, &cp, 0);
|
|
if (zoneval > max) {
|
|
max = (zoneval > INT64_MAX) ? INT64_MAX : zoneval;
|
|
}
|
|
}
|
|
|
|
return max;
|
|
}
|
|
|
|
static bool zoneinfo_parse_line(char *line, union zoneinfo *zi) {
|
|
char *cp = line;
|
|
char *ap;
|
|
char *save_ptr;
|
|
int64_t val;
|
|
int field_idx;
|
|
|
|
cp = strtok_r(line, " ", &save_ptr);
|
|
if (!cp) {
|
|
return true;
|
|
}
|
|
|
|
if (!strcmp(cp, "protection:")) {
|
|
ap = strtok_r(NULL, ")", &save_ptr);
|
|
} else {
|
|
ap = strtok_r(NULL, " ", &save_ptr);
|
|
}
|
|
|
|
if (!ap) {
|
|
return true;
|
|
}
|
|
|
|
switch (match_field(cp, ap, zoneinfo_field_names,
|
|
ZI_FIELD_COUNT, &val, &field_idx)) {
|
|
case (PARSE_SUCCESS):
|
|
zi->arr[field_idx] += val;
|
|
break;
|
|
case (NO_MATCH):
|
|
if (!strcmp(cp, "protection:")) {
|
|
zi->field.totalreserve_pages +=
|
|
zoneinfo_parse_protection(ap);
|
|
}
|
|
break;
|
|
case (PARSE_FAIL):
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int zoneinfo_parse(union zoneinfo *zi) {
|
|
static struct reread_data file_data = {
|
|
.filename = ZONEINFO_PATH,
|
|
.fd = -1,
|
|
};
|
|
char buf[PAGE_SIZE];
|
|
char *save_ptr;
|
|
char *line;
|
|
|
|
memset(zi, 0, sizeof(union zoneinfo));
|
|
|
|
if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
for (line = strtok_r(buf, "\n", &save_ptr); line;
|
|
line = strtok_r(NULL, "\n", &save_ptr)) {
|
|
if (!zoneinfo_parse_line(line, zi)) {
|
|
ALOGE("%s parse error", file_data.filename);
|
|
return -1;
|
|
}
|
|
}
|
|
zi->field.totalreserve_pages += zi->field.high;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* /prop/meminfo parsing routines */
|
|
static bool meminfo_parse_line(char *line, union meminfo *mi) {
|
|
char *cp = line;
|
|
char *ap;
|
|
char *save_ptr;
|
|
int64_t val;
|
|
int field_idx;
|
|
enum field_match_result match_res;
|
|
|
|
cp = strtok_r(line, " ", &save_ptr);
|
|
if (!cp) {
|
|
return false;
|
|
}
|
|
|
|
ap = strtok_r(NULL, " ", &save_ptr);
|
|
if (!ap) {
|
|
return false;
|
|
}
|
|
|
|
match_res = match_field(cp, ap, meminfo_field_names, MI_FIELD_COUNT,
|
|
&val, &field_idx);
|
|
if (match_res == PARSE_SUCCESS) {
|
|
mi->arr[field_idx] = val / page_k;
|
|
}
|
|
return (match_res != PARSE_FAIL);
|
|
}
|
|
|
|
static int meminfo_parse(union meminfo *mi) {
|
|
static struct reread_data file_data = {
|
|
.filename = MEMINFO_PATH,
|
|
.fd = -1,
|
|
};
|
|
char buf[PAGE_SIZE];
|
|
char *save_ptr;
|
|
char *line;
|
|
|
|
memset(mi, 0, sizeof(union meminfo));
|
|
|
|
if (reread_file(&file_data, buf, sizeof(buf)) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
for (line = strtok_r(buf, "\n", &save_ptr); line;
|
|
line = strtok_r(NULL, "\n", &save_ptr)) {
|
|
if (!meminfo_parse_line(line, mi)) {
|
|
ALOGE("%s parse error", file_data.filename);
|
|
return -1;
|
|
}
|
|
}
|
|
mi->field.nr_file_pages = mi->field.cached + mi->field.swap_cached +
|
|
mi->field.buffers;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void meminfo_log(union meminfo *mi) {
|
|
for (int field_idx = 0; field_idx < MI_FIELD_COUNT; field_idx++) {
|
|
android_log_write_int32(ctx, (int32_t)min(mi->arr[field_idx] * page_k, INT32_MAX));
|
|
}
|
|
|
|
android_log_write_list(ctx, LOG_ID_EVENTS);
|
|
android_log_reset(ctx);
|
|
}
|
|
|
|
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;
|
|
|
|
/* gid containing AID_READPROC required */
|
|
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;
|
|
|
|
/* gid containing AID_READPROC required */
|
|
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)]);
|
|
}
|
|
|
|
static struct proc *proc_get_heaviest(int oomadj) {
|
|
struct adjslot_list *head = &procadjslot_list[ADJTOSLOT(oomadj)];
|
|
struct adjslot_list *curr = head->next;
|
|
struct proc *maxprocp = NULL;
|
|
int maxsize = 0;
|
|
while (curr != head) {
|
|
int pid = ((struct proc *)curr)->pid;
|
|
int tasksize = proc_get_size(pid);
|
|
if (tasksize <= 0) {
|
|
struct adjslot_list *next = curr->next;
|
|
pid_remove(pid);
|
|
curr = next;
|
|
} else {
|
|
if (tasksize > maxsize) {
|
|
maxsize = tasksize;
|
|
maxprocp = (struct proc *)curr;
|
|
}
|
|
curr = curr->next;
|
|
}
|
|
}
|
|
return maxprocp;
|
|
}
|
|
|
|
static int last_killed_pid = -1;
|
|
|
|
/* Kill one process specified by procp. Returns the size of the process killed */
|
|
static int kill_one_process(struct proc* procp) {
|
|
int pid = procp->pid;
|
|
uid_t uid = procp->uid;
|
|
char *taskname;
|
|
int tasksize;
|
|
int r;
|
|
int result = -1;
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
struct memory_stat mem_st = {};
|
|
int memory_stat_parse_result = -1;
|
|
#endif
|
|
|
|
taskname = proc_get_name(pid);
|
|
if (!taskname) {
|
|
goto out;
|
|
}
|
|
|
|
tasksize = proc_get_size(pid);
|
|
if (tasksize <= 0) {
|
|
goto out;
|
|
}
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
if (enable_stats_log) {
|
|
if (per_app_memcg) {
|
|
memory_stat_parse_result = memory_stat_from_cgroup(&mem_st, pid, uid);
|
|
} else {
|
|
memory_stat_parse_result = memory_stat_from_procfs(&mem_st, pid);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
TRACE_KILL_START(pid);
|
|
|
|
/* CAP_KILL required */
|
|
r = kill(pid, SIGKILL);
|
|
inc_killcnt(procp->oomadj);
|
|
ALOGI("Kill '%s' (%d), uid %d, oom_adj %d to free %ldkB",
|
|
taskname, pid, uid, procp->oomadj, tasksize * page_k);
|
|
|
|
TRACE_KILL_END();
|
|
|
|
last_killed_pid = pid;
|
|
|
|
if (r) {
|
|
ALOGE("kill(%d): errno=%d", pid, errno);
|
|
goto out;
|
|
} else {
|
|
#ifdef LMKD_LOG_STATS
|
|
if (memory_stat_parse_result == 0) {
|
|
stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname,
|
|
procp->oomadj, mem_st.pgfault, mem_st.pgmajfault, mem_st.rss_in_bytes,
|
|
mem_st.cache_in_bytes, mem_st.swap_in_bytes);
|
|
} else if (enable_stats_log) {
|
|
stats_write_lmk_kill_occurred(log_ctx, LMK_KILL_OCCURRED, uid, taskname, procp->oomadj,
|
|
-1, -1, tasksize * BYTES_IN_KILOBYTE, -1, -1);
|
|
}
|
|
#endif
|
|
result = tasksize;
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* WARNING: After pid_remove() procp is freed and can't be used!
|
|
* Therefore placed at the end of the function.
|
|
*/
|
|
pid_remove(pid);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find one process to kill at or above the given oom_adj level.
|
|
* Returns size of the killed process.
|
|
*/
|
|
static int find_and_kill_process(int min_score_adj) {
|
|
int i;
|
|
int killed_size = 0;
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
bool lmk_state_change_start = false;
|
|
#endif
|
|
|
|
for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
|
|
struct proc *procp;
|
|
|
|
while (true) {
|
|
procp = kill_heaviest_task ?
|
|
proc_get_heaviest(i) : proc_adj_lru(i);
|
|
|
|
if (!procp)
|
|
break;
|
|
|
|
killed_size = kill_one_process(procp);
|
|
if (killed_size >= 0) {
|
|
#ifdef LMKD_LOG_STATS
|
|
if (enable_stats_log && !lmk_state_change_start) {
|
|
lmk_state_change_start = true;
|
|
stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED,
|
|
LMK_STATE_CHANGE_START);
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
if (killed_size) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
if (enable_stats_log && lmk_state_change_start) {
|
|
stats_write_lmk_state_changed(log_ctx, LMK_STATE_CHANGED, LMK_STATE_CHANGE_STOP);
|
|
}
|
|
#endif
|
|
|
|
return killed_size;
|
|
}
|
|
|
|
static int64_t get_memory_usage(struct reread_data *file_data) {
|
|
int ret;
|
|
int64_t mem_usage;
|
|
char buf[32];
|
|
|
|
if (reread_file(file_data, buf, sizeof(buf)) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (!parse_int64(buf, &mem_usage)) {
|
|
ALOGE("%s parse error", file_data->filename);
|
|
return -1;
|
|
}
|
|
if (mem_usage == 0) {
|
|
ALOGE("No memory!");
|
|
return -1;
|
|
}
|
|
return mem_usage;
|
|
}
|
|
|
|
void record_low_pressure_levels(union meminfo *mi) {
|
|
if (low_pressure_mem.min_nr_free_pages == -1 ||
|
|
low_pressure_mem.min_nr_free_pages > mi->field.nr_free_pages) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Low pressure min memory update from %" PRId64 " to %" PRId64,
|
|
low_pressure_mem.min_nr_free_pages, mi->field.nr_free_pages);
|
|
}
|
|
low_pressure_mem.min_nr_free_pages = mi->field.nr_free_pages;
|
|
}
|
|
/*
|
|
* Free memory at low vmpressure events occasionally gets spikes,
|
|
* possibly a stale low vmpressure event with memory already
|
|
* freed up (no memory pressure should have been reported).
|
|
* Ignore large jumps in max_nr_free_pages that would mess up our stats.
|
|
*/
|
|
if (low_pressure_mem.max_nr_free_pages == -1 ||
|
|
(low_pressure_mem.max_nr_free_pages < mi->field.nr_free_pages &&
|
|
mi->field.nr_free_pages - low_pressure_mem.max_nr_free_pages <
|
|
low_pressure_mem.max_nr_free_pages * 0.1)) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Low pressure max memory update from %" PRId64 " to %" PRId64,
|
|
low_pressure_mem.max_nr_free_pages, mi->field.nr_free_pages);
|
|
}
|
|
low_pressure_mem.max_nr_free_pages = mi->field.nr_free_pages;
|
|
}
|
|
}
|
|
|
|
enum vmpressure_level upgrade_level(enum vmpressure_level level) {
|
|
return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ?
|
|
level + 1 : level);
|
|
}
|
|
|
|
enum vmpressure_level downgrade_level(enum vmpressure_level level) {
|
|
return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ?
|
|
level - 1 : level);
|
|
}
|
|
|
|
static bool is_kill_pending(void) {
|
|
char buf[24];
|
|
|
|
if (last_killed_pid < 0) {
|
|
return false;
|
|
}
|
|
|
|
snprintf(buf, sizeof(buf), "/proc/%d/", last_killed_pid);
|
|
if (access(buf, F_OK) == 0) {
|
|
return true;
|
|
}
|
|
|
|
// reset last killed PID because there's nothing pending
|
|
last_killed_pid = -1;
|
|
return false;
|
|
}
|
|
|
|
static void mp_event_common(int data, uint32_t events __unused) {
|
|
int ret;
|
|
unsigned long long evcount;
|
|
int64_t mem_usage, memsw_usage;
|
|
int64_t mem_pressure;
|
|
enum vmpressure_level lvl;
|
|
union meminfo mi;
|
|
union zoneinfo zi;
|
|
struct timespec curr_tm;
|
|
static struct timespec last_kill_tm;
|
|
static unsigned long kill_skip_count = 0;
|
|
enum vmpressure_level level = (enum vmpressure_level)data;
|
|
long other_free = 0, other_file = 0;
|
|
int min_score_adj;
|
|
int minfree = 0;
|
|
static struct reread_data mem_usage_file_data = {
|
|
.filename = MEMCG_MEMORY_USAGE,
|
|
.fd = -1,
|
|
};
|
|
static struct reread_data memsw_usage_file_data = {
|
|
.filename = MEMCG_MEMORYSW_USAGE,
|
|
.fd = -1,
|
|
};
|
|
|
|
/*
|
|
* Check all event counters from low to critical
|
|
* and upgrade to the highest priority one. By reading
|
|
* eventfd we also reset the event counters.
|
|
*/
|
|
for (lvl = VMPRESS_LEVEL_LOW; lvl < VMPRESS_LEVEL_COUNT; lvl++) {
|
|
if (mpevfd[lvl] != -1 &&
|
|
TEMP_FAILURE_RETRY(read(mpevfd[lvl],
|
|
&evcount, sizeof(evcount))) > 0 &&
|
|
evcount > 0 && lvl > level) {
|
|
level = lvl;
|
|
}
|
|
}
|
|
|
|
if (clock_gettime(CLOCK_MONOTONIC_COARSE, &curr_tm) != 0) {
|
|
ALOGE("Failed to get current time");
|
|
return;
|
|
}
|
|
|
|
if (kill_timeout_ms) {
|
|
// If we're within the timeout, see if there's pending reclaim work
|
|
// from the last killed process. If there is (as evidenced by
|
|
// /proc/<pid> continuing to exist), skip killing for now.
|
|
if ((get_time_diff_ms(&last_kill_tm, &curr_tm) < kill_timeout_ms) &&
|
|
(low_ram_device || is_kill_pending())) {
|
|
kill_skip_count++;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (kill_skip_count > 0) {
|
|
ALOGI("%lu memory pressure events were skipped after a kill!",
|
|
kill_skip_count);
|
|
kill_skip_count = 0;
|
|
}
|
|
|
|
if (meminfo_parse(&mi) < 0 || zoneinfo_parse(&zi) < 0) {
|
|
ALOGE("Failed to get free memory!");
|
|
return;
|
|
}
|
|
|
|
if (use_minfree_levels) {
|
|
int i;
|
|
|
|
other_free = mi.field.nr_free_pages - zi.field.totalreserve_pages;
|
|
if (mi.field.nr_file_pages > (mi.field.shmem + mi.field.unevictable + mi.field.swap_cached)) {
|
|
other_file = (mi.field.nr_file_pages - mi.field.shmem -
|
|
mi.field.unevictable - mi.field.swap_cached);
|
|
} else {
|
|
other_file = 0;
|
|
}
|
|
|
|
min_score_adj = OOM_SCORE_ADJ_MAX + 1;
|
|
for (i = 0; i < lowmem_targets_size; i++) {
|
|
minfree = lowmem_minfree[i];
|
|
if (other_free < minfree && other_file < minfree) {
|
|
min_score_adj = lowmem_adj[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Ignore %s memory pressure event "
|
|
"(free memory=%ldkB, cache=%ldkB, limit=%ldkB)",
|
|
level_name[level], other_free * page_k, other_file * page_k,
|
|
(long)lowmem_minfree[lowmem_targets_size - 1] * page_k);
|
|
}
|
|
return;
|
|
}
|
|
|
|
goto do_kill;
|
|
}
|
|
|
|
if (level == VMPRESS_LEVEL_LOW) {
|
|
record_low_pressure_levels(&mi);
|
|
}
|
|
|
|
if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) {
|
|
/* Do not monitor this pressure level */
|
|
return;
|
|
}
|
|
|
|
if ((mem_usage = get_memory_usage(&mem_usage_file_data)) < 0) {
|
|
goto do_kill;
|
|
}
|
|
if ((memsw_usage = get_memory_usage(&memsw_usage_file_data)) < 0) {
|
|
goto do_kill;
|
|
}
|
|
|
|
// Calculate percent for swappinness.
|
|
mem_pressure = (mem_usage * 100) / memsw_usage;
|
|
|
|
if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) {
|
|
// We are swapping too much.
|
|
if (mem_pressure < upgrade_pressure) {
|
|
level = upgrade_level(level);
|
|
if (debug_process_killing) {
|
|
ALOGI("Event upgraded to %s", level_name[level]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we still have enough swap space available, check if we want to
|
|
// ignore/downgrade pressure events.
|
|
if (mi.field.free_swap >=
|
|
mi.field.total_swap * swap_free_low_percentage / 100) {
|
|
// 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", level_name[level]);
|
|
}
|
|
return;
|
|
} else if (level == VMPRESS_LEVEL_CRITICAL && mem_pressure > upgrade_pressure) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Downgrade critical memory pressure");
|
|
}
|
|
// Downgrade event, since enough memory available.
|
|
level = downgrade_level(level);
|
|
}
|
|
}
|
|
|
|
do_kill:
|
|
if (low_ram_device) {
|
|
/* For Go devices kill only one task */
|
|
if (find_and_kill_process(level_oomadj[level]) == 0) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Nothing to kill");
|
|
}
|
|
} else {
|
|
meminfo_log(&mi);
|
|
}
|
|
} else {
|
|
int pages_freed;
|
|
static struct timespec last_report_tm;
|
|
static unsigned long report_skip_count = 0;
|
|
|
|
if (!use_minfree_levels) {
|
|
/* If pressure level is less than critical and enough free swap then ignore */
|
|
if (level < VMPRESS_LEVEL_CRITICAL &&
|
|
mi.field.free_swap > low_pressure_mem.max_nr_free_pages) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Ignoring pressure since %" PRId64
|
|
" swap pages are available ",
|
|
mi.field.free_swap);
|
|
}
|
|
return;
|
|
}
|
|
/* Free up enough memory to downgrate the memory pressure to low level */
|
|
if (mi.field.nr_free_pages >= low_pressure_mem.max_nr_free_pages) {
|
|
if (debug_process_killing) {
|
|
ALOGI("Ignoring pressure since more memory is "
|
|
"available (%" PRId64 ") than watermark (%" PRId64 ")",
|
|
mi.field.nr_free_pages, low_pressure_mem.max_nr_free_pages);
|
|
}
|
|
return;
|
|
}
|
|
min_score_adj = level_oomadj[level];
|
|
}
|
|
|
|
pages_freed = find_and_kill_process(min_score_adj);
|
|
|
|
if (pages_freed == 0) {
|
|
/* Rate limit kill reports when nothing was reclaimed */
|
|
if (get_time_diff_ms(&last_report_tm, &curr_tm) < FAIL_REPORT_RLIMIT_MS) {
|
|
report_skip_count++;
|
|
return;
|
|
}
|
|
} else {
|
|
/* If we killed anything, update the last killed timestamp. */
|
|
last_kill_tm = curr_tm;
|
|
}
|
|
|
|
/* Log meminfo whenever we kill or when report rate limit allows */
|
|
meminfo_log(&mi);
|
|
|
|
if (use_minfree_levels) {
|
|
ALOGI("Reclaimed %ldkB, cache(%ldkB) and "
|
|
"free(%" PRId64 "kB)-reserved(%" PRId64 "kB) below min(%ldkB) for oom_adj %d",
|
|
pages_freed * page_k,
|
|
other_file * page_k, mi.field.nr_free_pages * page_k,
|
|
zi.field.totalreserve_pages * page_k,
|
|
minfree * page_k, min_score_adj);
|
|
} else {
|
|
ALOGI("Reclaimed %ldkB at oom_adj %d",
|
|
pages_freed * page_k, min_score_adj);
|
|
}
|
|
|
|
if (report_skip_count > 0) {
|
|
ALOGI("Suppressed %lu failed kill reports", report_skip_count);
|
|
report_skip_count = 0;
|
|
}
|
|
|
|
last_report_tm = curr_tm;
|
|
}
|
|
}
|
|
|
|
static bool init_mp_common(enum vmpressure_level level) {
|
|
int mpfd;
|
|
int evfd;
|
|
int evctlfd;
|
|
char buf[256];
|
|
struct epoll_event epev;
|
|
int ret;
|
|
int level_idx = (int)level;
|
|
const char *levelstr = level_name[level_idx];
|
|
|
|
/* gid containing AID_SYSTEM required */
|
|
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 = TEMP_FAILURE_RETRY(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;
|
|
/* use data to store event level */
|
|
vmpressure_hinfo[level_idx].data = level_idx;
|
|
vmpressure_hinfo[level_idx].handler = mp_event_common;
|
|
epev.data.ptr = (void *)&vmpressure_hinfo[level_idx];
|
|
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[level] = evfd;
|
|
close(evctlfd);
|
|
return true;
|
|
|
|
err:
|
|
close(evfd);
|
|
err_eventfd:
|
|
close(evctlfd);
|
|
err_open_evctlfd:
|
|
close(mpfd);
|
|
err_open_mpfd:
|
|
return false;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
// mark data connections as not connected
|
|
for (int i = 0; i < MAX_DATA_CONN; i++) {
|
|
data_sock[i].sock = -1;
|
|
}
|
|
|
|
ctrl_sock.sock = android_get_control_socket("lmkd");
|
|
if (ctrl_sock.sock < 0) {
|
|
ALOGE("get lmkd control socket failed");
|
|
return -1;
|
|
}
|
|
|
|
ret = listen(ctrl_sock.sock, MAX_DATA_CONN);
|
|
if (ret < 0) {
|
|
ALOGE("lmkd control socket listen failed (errno=%d)", errno);
|
|
return -1;
|
|
}
|
|
|
|
epev.events = EPOLLIN;
|
|
ctrl_sock.handler_info.handler = ctrl_connect_handler;
|
|
epev.data.ptr = (void *)&(ctrl_sock.handler_info);
|
|
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_sock.sock, &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;
|
|
|
|
if (use_inkernel_interface) {
|
|
ALOGI("Using in-kernel low memory killer interface");
|
|
} else {
|
|
if (!init_mp_common(VMPRESS_LEVEL_LOW) ||
|
|
!init_mp_common(VMPRESS_LEVEL_MEDIUM) ||
|
|
!init_mp_common(VMPRESS_LEVEL_CRITICAL)) {
|
|
ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
|
|
procadjslot_list[i].next = &procadjslot_list[i];
|
|
procadjslot_list[i].prev = &procadjslot_list[i];
|
|
}
|
|
|
|
memset(killcnt_idx, KILLCNT_INVALID_IDX, sizeof(killcnt_idx));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mainloop(void) {
|
|
struct event_handler_info* handler_info;
|
|
struct epoll_event *evt;
|
|
|
|
while (1) {
|
|
struct epoll_event events[maxevents];
|
|
int nevents;
|
|
int i;
|
|
|
|
nevents = epoll_wait(epollfd, events, maxevents, -1);
|
|
|
|
if (nevents == -1) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
ALOGE("epoll_wait failed (errno=%d)", errno);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* First pass to see if any data socket connections were dropped.
|
|
* Dropped connection should be handled before any other events
|
|
* to deallocate data connection and correctly handle cases when
|
|
* connection gets dropped and reestablished in the same epoll cycle.
|
|
* In such cases it's essential to handle connection closures first.
|
|
*/
|
|
for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
|
|
if ((evt->events & EPOLLHUP) && evt->data.ptr) {
|
|
ALOGI("lmkd data connection dropped");
|
|
handler_info = (struct event_handler_info*)evt->data.ptr;
|
|
ctrl_data_close(handler_info->data);
|
|
}
|
|
}
|
|
|
|
/* Second pass to handle all other events */
|
|
for (i = 0, evt = &events[0]; i < nevents; ++i, evt++) {
|
|
if (evt->events & EPOLLERR)
|
|
ALOGD("EPOLLERR on event #%d", i);
|
|
if (evt->events & EPOLLHUP) {
|
|
/* This case was handled in the first pass */
|
|
continue;
|
|
}
|
|
if (evt->data.ptr) {
|
|
handler_info = (struct event_handler_info*)evt->data.ptr;
|
|
handler_info->handler(handler_info->data, evt->events);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int main(int argc __unused, char **argv __unused) {
|
|
struct sched_param param = {
|
|
.sched_priority = 1,
|
|
};
|
|
|
|
/* By default disable low level vmpressure events */
|
|
level_oomadj[VMPRESS_LEVEL_LOW] =
|
|
property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1);
|
|
level_oomadj[VMPRESS_LEVEL_MEDIUM] =
|
|
property_get_int32("ro.lmk.medium", 800);
|
|
level_oomadj[VMPRESS_LEVEL_CRITICAL] =
|
|
property_get_int32("ro.lmk.critical", 0);
|
|
debug_process_killing = property_get_bool("ro.lmk.debug", false);
|
|
|
|
/* By default disable upgrade/downgrade logic */
|
|
enable_pressure_upgrade =
|
|
property_get_bool("ro.lmk.critical_upgrade", false);
|
|
upgrade_pressure =
|
|
(int64_t)property_get_int32("ro.lmk.upgrade_pressure", 100);
|
|
downgrade_pressure =
|
|
(int64_t)property_get_int32("ro.lmk.downgrade_pressure", 100);
|
|
kill_heaviest_task =
|
|
property_get_bool("ro.lmk.kill_heaviest_task", false);
|
|
low_ram_device = property_get_bool("ro.config.low_ram", false);
|
|
kill_timeout_ms =
|
|
(unsigned long)property_get_int32("ro.lmk.kill_timeout_ms", 0);
|
|
use_minfree_levels =
|
|
property_get_bool("ro.lmk.use_minfree_levels", false);
|
|
per_app_memcg =
|
|
property_get_bool("ro.config.per_app_memcg", low_ram_device);
|
|
swap_free_low_percentage =
|
|
property_get_int32("ro.lmk.swap_free_low_percentage", 10);
|
|
|
|
ctx = create_android_logger(MEMINFO_LOG_TAG);
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
statslog_init(&log_ctx, &enable_stats_log);
|
|
#endif
|
|
|
|
if (!init()) {
|
|
if (!use_inkernel_interface) {
|
|
/*
|
|
* MCL_ONFAULT pins pages as they fault instead of loading
|
|
* everything immediately all at once. (Which would be bad,
|
|
* because as of this writing, we have a lot of mapped pages we
|
|
* never use.) Old kernels will see MCL_ONFAULT and fail with
|
|
* EINVAL; we ignore this failure.
|
|
*
|
|
* N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT
|
|
* pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault
|
|
* in pages.
|
|
*/
|
|
/* CAP_IPC_LOCK required */
|
|
if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && (errno != EINVAL)) {
|
|
ALOGW("mlockall failed %s", strerror(errno));
|
|
}
|
|
|
|
/* CAP_NICE required */
|
|
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
|
|
ALOGW("set SCHED_FIFO failed %s", strerror(errno));
|
|
}
|
|
}
|
|
|
|
mainloop();
|
|
}
|
|
|
|
#ifdef LMKD_LOG_STATS
|
|
statslog_destroy(&log_ctx);
|
|
#endif
|
|
|
|
android_log_destroy(&ctx);
|
|
|
|
ALOGI("exiting");
|
|
return 0;
|
|
}
|