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statslog.cpp
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statslog.cpp
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/*
* Copyright 2018 Google, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <log/log.h>
#include <log/log_id.h>
#include <statslog.h>
#include <stdlib.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <time.h>
#include <unistd.h>
#include <string>
#include <processgroup/processgroup.h>
#ifdef LMKD_LOG_STATS
#define STRINGIFY(x) STRINGIFY_INTERNAL(x)
#define STRINGIFY_INTERNAL(x) #x
/**
* Used to make sure that the payload is always smaller than LMKD_REPLY_MAX_SIZE
*/
#define BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
static bool enable_stats_log = property_get_bool("ro.lmk.log_stats", true);
struct proc {
int pid;
char taskname[MAX_TASKNAME_LEN];
struct proc* pidhash_next;
};
#define PIDHASH_SZ 1024
static struct proc** pidhash = NULL;
#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
static struct proc* pid_lookup(int pid) {
struct proc* procp;
if (!pidhash) return NULL;
for (procp = pidhash[pid_hashfn(pid)]; procp && procp->pid != pid; procp = procp->pidhash_next)
;
return procp;
}
static void memory_stat_parse_line(char* line, struct memory_stat* mem_st) {
char key[MAX_TASKNAME_LEN + 1];
int64_t value;
sscanf(line, "%" STRINGIFY(MAX_TASKNAME_LEN) "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 __unused) {
std::string path;
if (!CgroupGetAttributePathForTask("MemStats", pid, &path)) {
ALOGE("Querying MemStats path failed");
return -1;
}
FILE* fp = fopen(path.c_str(), "r");
if (fp == NULL) {
return -1;
}
char buf[PAGE_SIZE];
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) {
return -1;
}
ret = read(fd, buffer, sizeof(buffer));
if (ret < 0) {
close(fd);
return -1;
}
close(fd);
// field 10 is pgfault
// field 12 is pgmajfault
// field 22 is starttime
int64_t pgfault = 0, pgmajfault = 0, starttime = 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 "
"%" SCNd64 "",
&pgfault, &pgmajfault, &starttime) != 3) {
return -1;
}
mem_st->pgfault = pgfault;
mem_st->pgmajfault = pgmajfault;
mem_st->process_start_time_ns = starttime * (NS_PER_SEC / sysconf(_SC_CLK_TCK));
return 0;
}
struct memory_stat *stats_read_memory_stat(bool per_app_memcg, int pid, uid_t uid,
int64_t rss_bytes, int64_t swap_bytes) {
static struct memory_stat mem_st = {};
if (!enable_stats_log) {
return NULL;
}
if (per_app_memcg) {
if (memory_stat_from_cgroup(&mem_st, pid, uid) == 0) {
return &mem_st;
}
} else {
if (memory_stat_from_procfs(&mem_st, pid) == 0) {
mem_st.rss_in_bytes = rss_bytes;
mem_st.swap_in_bytes = swap_bytes;
return &mem_st;
}
}
return NULL;
}
static void proc_insert(struct proc* procp) {
if (!pidhash) {
pidhash = static_cast<struct proc**>(calloc(PIDHASH_SZ, sizeof(*pidhash)));
}
int hval = pid_hashfn(procp->pid);
procp->pidhash_next = pidhash[hval];
pidhash[hval] = procp;
}
void stats_remove_taskname(int pid) {
if (!enable_stats_log || !pidhash) {
return;
}
int hval = pid_hashfn(pid);
struct proc* procp;
struct proc* prevp;
for (procp = pidhash[hval], prevp = NULL; procp && procp->pid != pid;
procp = procp->pidhash_next)
prevp = procp;
if (!procp)
return;
if (!prevp)
pidhash[hval] = procp->pidhash_next;
else
prevp->pidhash_next = procp->pidhash_next;
free(procp);
}
void stats_store_taskname(int pid, const char* taskname) {
if (!enable_stats_log || !taskname) {
return;
}
struct proc* procp = pid_lookup(pid);
if (procp != NULL) {
if (strcmp(procp->taskname, taskname) == 0) {
return;
}
stats_remove_taskname(pid);
}
procp = static_cast<struct proc*>(malloc(sizeof(struct proc)));
procp->pid = pid;
strncpy(procp->taskname, taskname, MAX_TASKNAME_LEN - 1);
procp->taskname[MAX_TASKNAME_LEN - 1] = '\0';
proc_insert(procp);
}
void stats_purge_tasknames() {
if (!enable_stats_log || !pidhash) {
return;
}
struct proc* procp;
struct proc* next;
int i;
for (i = 0; i < PIDHASH_SZ; i++) {
procp = pidhash[i];
while (procp) {
next = procp->pidhash_next;
free(procp);
procp = next;
}
}
memset(pidhash, 0, PIDHASH_SZ * sizeof(*pidhash));
}
const char* stats_get_task_name(int pid) {
struct proc* proc = pid_lookup(pid);
return proc ? proc->taskname : NULL;
}
/**
* Writes int32 in a machine independent way
* https://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html#writeInt(int)
*/
static inline size_t pack_int32(LMK_KILL_OCCURRED_PACKET packet,
size_t index,
int32_t value) {
int32_t* int_buffer = (int32_t*)(packet + index);
*int_buffer = htonl(value);
return index + sizeof(int32_t);
}
/**
* Writes int64 in a machine independent way
* https://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html#writeLong(long)
*/
static inline size_t pack_int64(LMK_KILL_OCCURRED_PACKET packet,
size_t index,
int64_t value) {
int64_t* int64_buffer = (int64_t*)(packet + index);
*int64_buffer = htonq(value);
return index + sizeof(int64_t);
}
/**
* Writes ANSI string in a machine independent way
* https://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html#writeShort(int)
* 2 bytes str len following n chars
* to be read on the Java side with
* https://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html#readUTF()
* Truncates the value string & packs up to MAX_TASKNAME_LEN - 1 chars
*/
static inline size_t pack_string(LMK_KILL_OCCURRED_PACKET packet,
size_t index,
const char* value) {
const size_t len_proc_name = MIN(strlen(value), MAX_TASKNAME_LEN - 1);
int16_t* short_buffer = (int16_t*)(packet + index);
*short_buffer = htons((int16_t)len_proc_name);
char* byte_buffer = (char*)(short_buffer + 1);
strncpy(byte_buffer, value, MAX_TASKNAME_LEN - 1);
byte_buffer[MAX_TASKNAME_LEN - 1] = '\0';
return index + sizeof(int16_t) + len_proc_name + 1;
}
size_t lmkd_pack_set_kill_occurred(LMK_KILL_OCCURRED_PACKET packet,
struct kill_stat *kill_stat,
struct memory_stat *mem_stat) {
BUILD_BUG_ON(sizeof(LMK_KILL_OCCURRED_PACKET) > LMKD_REPLY_MAX_SIZE);
if (!enable_stats_log) {
return 0;
}
int32_t index = 0;
index = pack_int32(packet, index, LMK_STAT_KILL_OCCURRED);
if (mem_stat) {
index = pack_int64(packet, index, mem_stat->pgfault);
index = pack_int64(packet, index, mem_stat->pgmajfault);
index = pack_int64(packet, index, mem_stat->rss_in_bytes);
index = pack_int64(packet, index, mem_stat->cache_in_bytes);
index = pack_int64(packet, index, mem_stat->swap_in_bytes);
index = pack_int64(packet, index, mem_stat->process_start_time_ns);
} else {
index = pack_int64(packet, index, -1);
index = pack_int64(packet, index, -1);
index = pack_int64(packet, index, -1);
index = pack_int64(packet, index, -1);
index = pack_int64(packet, index, -1);
index = pack_int64(packet, index, -1);
}
index = pack_int32(packet, index, kill_stat->uid);
index = pack_int32(packet, index, kill_stat->oom_score);
index = pack_int32(packet, index, kill_stat->min_oom_score);
index = pack_int32(packet, index, (int)kill_stat->free_mem_kb);
index = pack_int32(packet, index, (int)kill_stat->free_swap_kb);
index = pack_int32(packet, index, (int)kill_stat->kill_reason);
index = pack_int32(packet, index, kill_stat->thrashing);
index = pack_int32(packet, index, kill_stat->max_thrashing);
index = pack_string(packet, index, kill_stat->taskname);
return index;
}
size_t lmkd_pack_set_state_changed(LMKD_CTRL_PACKET packet,
enum lmk_state state) {
if (!enable_stats_log) {
return 0;
}
packet[0] = htonl(LMK_STAT_STATE_CHANGED);
packet[1] = htonl(state);
return 2 * sizeof(int);
}
#endif /* LMKD_LOG_STATS */