3948f80f2a
Move kernel low memory killer logic to new daemon lmkd. ActivityManager communicates with this daemon over a named socket. Change-Id: Ie957da7e9b1f7150e23c689fdadf23ff260b47be
735 lines
18 KiB
C
735 lines
18 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 <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/epoll.h>
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#include <sys/eventfd.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <cutils/log.h>
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#include <cutils/sockets.h>
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#define MEMCG_SYSFS_PATH "/dev/memcg/"
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#define MEMPRESSURE_WATCH_LEVEL "medium"
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#define ZONEINFO_PATH "/proc/zoneinfo"
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#define LINE_MAX 128
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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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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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};
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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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/* 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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/* memory pressure level medium event */
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static int mpevfd;
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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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/* 1 memory pressure level, 1 ctrl listen socket, 1 ctrl data socket */
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#define MAX_EPOLL_EVENTS 3
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static int epollfd;
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static int maxevents;
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#define OOM_DISABLE (-17)
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/* inclusive */
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#define OOM_ADJUST_MIN (-16)
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#define OOM_ADJUST_MAX 15
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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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struct sysmeminfo {
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int nr_free_pages;
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int nr_file_pages;
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int nr_shmem;
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int totalreserve_pages;
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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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int oomadj;
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struct proc *pidhash_next;
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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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#define ADJTOSLOT(adj) (adj + -OOM_ADJUST_MIN)
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static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_ADJUST_MAX) + 1];
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/*
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* Wait 1-2 seconds for the death report of a killed process prior to
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* considering killing more processes.
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*/
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#define KILL_TIMEOUT 2
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/* Time of last process kill we initiated, stop me before I kill again */
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static time_t kill_lasttime;
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/* PAGE_SIZE / 1024 */
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static long page_k;
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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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static void writefilestring(char *path, char *s) {
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int fd = open(path, O_WRONLY);
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int len = strlen(s);
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int ret;
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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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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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close(fd);
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}
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static void cmd_procprio(int pid, 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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if (oomadj < OOM_DISABLE || oomadj > OOM_ADJUST_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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snprintf(path, sizeof(path), "/proc/%d/oom_adj", pid);
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snprintf(val, sizeof(val), "%d", oomadj);
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writefilestring(path, val);
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if (use_inkernel_interface)
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return;
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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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procp->pid = pid;
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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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static void cmd_procremove(int pid) {
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struct proc *procp;
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if (use_inkernel_interface)
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return;
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pid_remove(pid);
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kill_lasttime = 0;
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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++) {
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lowmem_minfree[i] = ntohl(*params++);
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lowmem_adj[i] = ntohl(*params++);
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}
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lowmem_targets_size = ntargets;
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if (use_inkernel_interface) {
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char minfreestr[128];
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char killpriostr[128];
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minfreestr[0] = '\0';
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killpriostr[0] = '\0';
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for (i = 0; i < lowmem_targets_size; i++) {
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char val[40];
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if (i) {
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strlcat(minfreestr, ",", sizeof(minfreestr));
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strlcat(killpriostr, ",", sizeof(killpriostr));
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}
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snprintf(val, sizeof(val), "%d", lowmem_minfree[i]);
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strlcat(minfreestr, val, sizeof(minfreestr));
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snprintf(val, sizeof(val), "%d", lowmem_adj[i]);
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strlcat(killpriostr, val, sizeof(killpriostr));
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}
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writefilestring(INKERNEL_MINFREE_PATH, minfreestr);
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writefilestring(INKERNEL_ADJ_PATH, killpriostr);
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}
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}
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static void ctrl_data_close(void) {
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ALOGI("Closing Activity Manager data connection");
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close(ctrl_dfd);
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ctrl_dfd = -1;
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maxevents--;
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}
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static int ctrl_data_read(char *buf, size_t bufsz) {
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int ret = 0;
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ret = read(ctrl_dfd, buf, bufsz);
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if (ret == -1) {
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ALOGE("control data socket read failed; errno=%d", errno);
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} else if (ret == 0) {
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ALOGE("Got EOF on control data socket");
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ret = -1;
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}
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return ret;
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}
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static void ctrl_command_handler(void) {
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int ibuf[CTRL_PACKET_MAX / sizeof(int)];
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int len;
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int cmd = -1;
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int nargs;
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int targets;
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len = ctrl_data_read((char *)ibuf, CTRL_PACKET_MAX);
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if (len <= 0)
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return;
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nargs = len / sizeof(int) - 1;
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if (nargs < 0)
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goto wronglen;
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cmd = ntohl(ibuf[0]);
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switch(cmd) {
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case LMK_TARGET:
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targets = nargs / 2;
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if (nargs & 0x1 || targets > (int)ARRAY_SIZE(lowmem_adj))
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goto wronglen;
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cmd_target(targets, &ibuf[1]);
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break;
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case LMK_PROCPRIO:
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if (nargs != 2)
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goto wronglen;
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cmd_procprio(ntohl(ibuf[1]), ntohl(ibuf[2]));
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break;
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case LMK_PROCREMOVE:
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if (nargs != 1)
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goto wronglen;
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cmd_procremove(ntohl(ibuf[1]));
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break;
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default:
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ALOGE("Received unknown command code %d", cmd);
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return;
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}
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return;
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wronglen:
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ALOGE("Wrong control socket read length cmd=%d len=%d", cmd, len);
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}
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static void ctrl_data_handler(uint32_t events) {
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if (events & EPOLLHUP) {
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ALOGI("ActivityManager disconnected");
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if (!ctrl_dfd_reopened)
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ctrl_data_close();
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} else if (events & EPOLLIN) {
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ctrl_command_handler();
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}
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}
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static void ctrl_connect_handler(uint32_t events) {
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struct sockaddr addr;
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socklen_t alen;
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struct epoll_event epev;
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if (ctrl_dfd >= 0) {
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ctrl_data_close();
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ctrl_dfd_reopened = 1;
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}
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alen = sizeof(addr);
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ctrl_dfd = accept(ctrl_lfd, &addr, &alen);
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if (ctrl_dfd < 0) {
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ALOGE("lmkd control socket accept failed; errno=%d", errno);
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return;
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}
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ALOGI("ActivityManager connected");
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maxevents++;
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epev.events = EPOLLIN;
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epev.data.ptr = (void *)ctrl_data_handler;
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if (epoll_ctl(epollfd, EPOLL_CTL_ADD, ctrl_dfd, &epev) == -1) {
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ALOGE("epoll_ctl for data connection socket failed; errno=%d", errno);
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ctrl_data_close();
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return;
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}
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}
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static int zoneinfo_parse_protection(char *cp) {
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int max = 0;
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int zoneval;
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if (*cp++ != '(')
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return 0;
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do {
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zoneval = strtol(cp, &cp, 0);
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if ((*cp != ',') && (*cp != ')'))
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return 0;
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if (zoneval > max)
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max = zoneval;
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} while (cp = strtok(NULL, " "));
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return max;
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}
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static void zoneinfo_parse_line(char *line, struct sysmeminfo *mip) {
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char *cp = line;
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char *ap;
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cp = strtok(line, " ");
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if (!cp)
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return;
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ap = strtok(NULL, " ");
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if (!ap)
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return;
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if (!strcmp(cp, "nr_free_pages"))
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mip->nr_free_pages += strtol(ap, NULL, 0);
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else if (!strcmp(cp, "nr_file_pages"))
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mip->nr_file_pages += strtol(ap, NULL, 0);
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else if (!strcmp(cp, "nr_shmem"))
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mip->nr_shmem += strtol(ap, NULL, 0);
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else if (!strcmp(cp, "high"))
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mip->totalreserve_pages += strtol(ap, NULL, 0);
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else if (!strcmp(cp, "protection:"))
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mip->totalreserve_pages += zoneinfo_parse_protection(ap);
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}
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static int zoneinfo_parse(struct sysmeminfo *mip) {
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FILE *f;
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char *cp;
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char line[LINE_MAX];
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memset(mip, 0, sizeof(struct sysmeminfo));
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f = fopen(ZONEINFO_PATH, "r");
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if (!f) {
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ALOGE("%s open: errno=%d", ZONEINFO_PATH, errno);
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return -1;
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}
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while (fgets(line, LINE_MAX, f))
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zoneinfo_parse_line(line, mip);
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fclose(f);
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return 0;
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}
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static int proc_get_size(int pid) {
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char path[PATH_MAX];
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char line[LINE_MAX];
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FILE *f;
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int rss = 0;
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int total;
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snprintf(path, PATH_MAX, "/proc/%d/statm", pid);
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f = fopen(path, "r");
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if (!f)
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return -1;
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if (!fgets(line, LINE_MAX, f)) {
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fclose(f);
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return -1;
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}
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sscanf(line, "%d %d ", &total, &rss);
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fclose(f);
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return rss;
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}
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static char *proc_get_name(int pid) {
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char path[PATH_MAX];
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static char line[LINE_MAX];
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FILE *f;
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char *cp;
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snprintf(path, PATH_MAX, "/proc/%d/cmdline", pid);
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f = fopen(path, "r");
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if (!f)
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return NULL;
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if (!fgets(line, LINE_MAX, f)) {
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fclose(f);
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return NULL;
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}
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cp = strchr(line, ' ');
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if (cp)
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*cp = '\0';
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return line;
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}
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static struct proc *proc_adj_lru(int oomadj) {
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return (struct proc *)adjslot_tail(&procadjslot_list[ADJTOSLOT(oomadj)]);
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}
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static void mp_event(uint32_t events) {
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int i;
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int ret;
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unsigned long long evcount;
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struct sysmeminfo mi;
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int other_free;
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int other_file;
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int minfree = 0;
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int min_score_adj = OOM_ADJUST_MAX + 1;
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ret = read(mpevfd, &evcount, sizeof(evcount));
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if (ret < 0)
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ALOGE("Error reading memory pressure event fd; errno=%d",
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errno);
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if (time(NULL) - kill_lasttime < KILL_TIMEOUT)
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return;
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if (zoneinfo_parse(&mi) < 0)
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return;
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other_free = mi.nr_free_pages - mi.totalreserve_pages;
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other_file = mi.nr_file_pages - mi.nr_shmem;
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for (i = 0; i < lowmem_targets_size; i++) {
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minfree = lowmem_minfree[i];
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if (other_free < minfree && other_file < minfree) {
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min_score_adj = lowmem_adj[i];
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break;
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}
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}
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if (min_score_adj == OOM_ADJUST_MAX + 1)
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return;
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for (i = OOM_ADJUST_MAX; i >= min_score_adj; i--) {
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struct proc *procp;
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retry:
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procp = proc_adj_lru(i);
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if (procp) {
|
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int pid = procp->pid;
|
|
char *taskname;
|
|
int tasksize;
|
|
int r;
|
|
|
|
taskname = proc_get_name(pid);
|
|
if (!taskname) {
|
|
pid_remove(pid);
|
|
goto retry;
|
|
}
|
|
|
|
tasksize = proc_get_size(pid);
|
|
if (tasksize < 0) {
|
|
pid_remove(pid);
|
|
goto retry;
|
|
}
|
|
|
|
ALOGI("Killing '%s' (%d), adj %d\n"
|
|
" to free %ldkB because cache %ldkB is below limit %ldkB for oom_adj %d\n"
|
|
" Free memory is %ldkB %s reserved",
|
|
taskname, pid, procp->oomadj, tasksize * page_k,
|
|
other_file * page_k, minfree * page_k, min_score_adj,
|
|
other_free * page_k, other_free >= 0 ? "above" : "below");
|
|
r = kill(pid, SIGKILL);
|
|
pid_remove(pid);
|
|
|
|
if (r) {
|
|
ALOGE("kill(%d): errno=%d", procp->pid, errno);
|
|
goto retry;
|
|
} else {
|
|
time(&kill_lasttime);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int init_mp(char *levelstr, void *event_handler)
|
|
{
|
|
int mpfd;
|
|
int evfd;
|
|
int evctlfd;
|
|
char buf[256];
|
|
struct epoll_event epev;
|
|
int ret;
|
|
|
|
mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY);
|
|
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);
|
|
if (evctlfd < 0) {
|
|
ALOGI("No kernel memory cgroup event control (errno=%d)", errno);
|
|
goto err_open_evctlfd;
|
|
}
|
|
|
|
evfd = eventfd(0, EFD_NONBLOCK);
|
|
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 = evfd;
|
|
return 0;
|
|
|
|
err:
|
|
close(evfd);
|
|
err_eventfd:
|
|
close(evctlfd);
|
|
err_open_evctlfd:
|
|
close(mpfd);
|
|
err_open_mpfd:
|
|
return -1;
|
|
}
|
|
|
|
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++;
|
|
|
|
use_inkernel_interface = !access(INKERNEL_MINFREE_PATH, W_OK);
|
|
|
|
if (use_inkernel_interface) {
|
|
ALOGI("Using in-kernel low memory killer interface");
|
|
} else {
|
|
ret = init_mp(MEMPRESSURE_WATCH_LEVEL, (void *)&mp_event);
|
|
if (ret)
|
|
ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
|
|
}
|
|
|
|
for (i = 0; i <= ADJTOSLOT(OOM_ADJUST_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, char **argv) {
|
|
if (!init())
|
|
mainloop();
|
|
|
|
ALOGI("exiting");
|
|
return 0;
|
|
}
|