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libsuspend: move to exponential backoff

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am: fb896944b6

Change-Id: Ib94c5340ff89a6e2f3823a2eaa2be445e097cfa0
This commit is contained in:
Tim Murray 2016-10-12 18:13:18 +00:00 • committed by android-build-merger
commit cf11830695
1 changed files with 19 additions and 5 deletions
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24
libsuspend/autosuspend_wakeup_count.c
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@ -21,6 +21,7 @@
#include <stddef.h> #include <stddef.h>
#include <stdbool.h> #include <stdbool.h>
#include <string.h> #include <string.h>
#include <sys/param.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h> #include <unistd.h>
@ -34,12 +35,24 @@
#define SYS_POWER_STATE "/sys/power/state" #define SYS_POWER_STATE "/sys/power/state"
#define SYS_POWER_WAKEUP_COUNT "/sys/power/wakeup_count" #define SYS_POWER_WAKEUP_COUNT "/sys/power/wakeup_count"
#define BASE_SLEEP_TIME 100000
static int state_fd; static int state_fd;
static int wakeup_count_fd; static int wakeup_count_fd;
static pthread_t suspend_thread; static pthread_t suspend_thread;
static sem_t suspend_lockout; static sem_t suspend_lockout;
static const char *sleep_state = "mem"; static const char *sleep_state = "mem";
static void (*wakeup_func)(bool success) = NULL; static void (*wakeup_func)(bool success) = NULL;
static int sleep_time = BASE_SLEEP_TIME;
static void update_sleep_time(bool success) {
if (success) {
sleep_time = BASE_SLEEP_TIME;
return;
}
// double sleep time after each failure up to one minute
sleep_time = MIN(sleep_time * 2, 60000000);
}
static void *suspend_thread_func(void *arg __attribute__((unused))) static void *suspend_thread_func(void *arg __attribute__((unused)))
{ {
@ -47,10 +60,12 @@ static void *suspend_thread_func(void *arg __attribute__((unused)))
char wakeup_count[20]; char wakeup_count[20];
int wakeup_count_len; int wakeup_count_len;
int ret; int ret;
bool success; bool success = true;
while (1) { while (1) {
usleep(100000); update_sleep_time(success);
usleep(sleep_time);
success = false;
ALOGV("%s: read wakeup_count\n", __func__); ALOGV("%s: read wakeup_count\n", __func__);
lseek(wakeup_count_fd, 0, SEEK_SET); lseek(wakeup_count_fd, 0, SEEK_SET);
wakeup_count_len = TEMP_FAILURE_RETRY(read(wakeup_count_fd, wakeup_count, wakeup_count_len = TEMP_FAILURE_RETRY(read(wakeup_count_fd, wakeup_count,
@ -74,7 +89,6 @@ static void *suspend_thread_func(void *arg __attribute__((unused)))
continue; continue;
} }
success = true;
ALOGV("%s: write %*s to wakeup_count\n", __func__, wakeup_count_len, wakeup_count); ALOGV("%s: write %*s to wakeup_count\n", __func__, wakeup_count_len, wakeup_count);
ret = TEMP_FAILURE_RETRY(write(wakeup_count_fd, wakeup_count, wakeup_count_len)); ret = TEMP_FAILURE_RETRY(write(wakeup_count_fd, wakeup_count, wakeup_count_len));
if (ret < 0) { if (ret < 0) {
@ -83,8 +97,8 @@ static void *suspend_thread_func(void *arg __attribute__((unused)))
} else { } else {
ALOGV("%s: write %s to %s\n", __func__, sleep_state, SYS_POWER_STATE); ALOGV("%s: write %s to %s\n", __func__, sleep_state, SYS_POWER_STATE);
ret = TEMP_FAILURE_RETRY(write(state_fd, sleep_state, strlen(sleep_state))); ret = TEMP_FAILURE_RETRY(write(state_fd, sleep_state, strlen(sleep_state)));
if (ret < 0) { if (ret >= 0) {
success = false; success = true;
} }
void (*func)(bool success) = wakeup_func; void (*func)(bool success) = wakeup_func;
if (func != NULL) { if (func != NULL) {