diff options
Diffstat (limited to 'source/module/monitor_timer.c')
| -rw-r--r-- | source/module/monitor_timer.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/source/module/monitor_timer.c b/source/module/monitor_timer.c new file mode 100644 index 0000000..ef40d94 --- /dev/null +++ b/source/module/monitor_timer.c @@ -0,0 +1,195 @@ +#include "monitor_timer.h" + +#define TIMER_FILLED(timer) ((timer)->sentinel >= TIMER_MAX_WATCH_NUM) +#define TIMER_EMPTY(timer) (!((timer)->time_ns | (timer)->sentinel)) +#define TIMER_NO_KWARG(timer) ((timer)->sentinel == 0) + +unsigned char del_all_kwarg_by_pid(pid_t pid) { + int i = 0; + kernel_watch_timer *timer = NULL; + + printk(KERN_INFO "del kwarg..."); + + for (i = 0; i < kernel_wtimer_num; i++) { + timer = &(kernel_wtimer_list[i]); + timer_del_watch_by_pid(timer, pid); + } + for (i = 0; i < kernel_wtimer_num; i++) { + timer = &(kernel_wtimer_list[i]); + if (TIMER_NO_KWARG(timer)) // no available kwarg + { + if (i != kernel_wtimer_num - 1) { + memcpy(timer, &kernel_wtimer_list[kernel_wtimer_num - 1], + sizeof(kernel_watch_timer)); + } + kernel_wtimer_num--; + i--; + } + } + return 0; +} + +/// @brief get a valuable timer +/// @param time_ns +/// @return kernel_watch_timer *, NULL means fail +kernel_watch_timer *get_timer(unsigned long long time_ns) { + int i = 0; + kernel_watch_timer *timer = NULL; + // chose a timer + for (i = 0; i < kernel_wtimer_num; i++) { + timer = &kernel_wtimer_list[i]; + + if (TIMER_EMPTY(timer)) { + break; + } + if ((timer->time_ns == time_ns) && (!TIMER_FILLED(timer))) { + break; + } + } + // if all timer is full + if (i >= MAX_TIMER_NUM) { + printk(KERN_ERR "No timer available\n"); + return NULL; + } + // if a new timer, init it + if (i > kernel_wtimer_num - 1) { + printk(KERN_INFO "New timer\n"); + + kernel_wtimer_list[i].time_ns = time_ns; + kernel_wtimer_list[i].sentinel = 0; + + kernel_wtimer_list[i].kt = ktime_set(0, (unsigned long)time_ns); // ns + // CLOCK_MONOTONIC: time since boot | HRTIMER_MODE_REL : relative time + hrtimer_init(&(kernel_wtimer_list[i].hr_timer), CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + kernel_wtimer_list[i].hr_timer.function = + check_variable_cb; // callback function + + kernel_wtimer_num = i + 1; + } + printk(KERN_INFO "now, we have %d timers\n", kernel_wtimer_num); + return &kernel_wtimer_list[i]; +} + +/// @brief hrTimer add watch +/// @param timer +/// @param k_watch_arg +/// @return 0 is success +unsigned char timer_add_watch(kernel_watch_timer *timer, + kernel_watch_arg k_watch_arg) { + if (TIMER_FILLED(timer)) { + printk(KERN_ERR "Timer is full\n"); + return -1; + } + memcpy(&timer->k_watch_args[timer->sentinel], &k_watch_arg, + sizeof(k_watch_arg)); + // timer->k_watch_args[timer->sentinel] = k_watch_arg; + timer->sentinel++; + return 0; +} + +unsigned char timer_del_watch_by_pid(kernel_watch_timer *timer, pid_t pid) { + int i = 0; + for (i = 0; i < timer->sentinel; i++) { + // if pid match, delete it and move the last one to this position, check + // again + if (timer->k_watch_args[i].task_id == pid) { + if (i != timer->sentinel - 1) { + memcpy(&timer->k_watch_args[i], + &timer->k_watch_args[timer->sentinel - 1], + sizeof(kernel_watch_arg)); + } + timer->sentinel--; + i--; + } + } + return 0; +} + +/// @brief hrTimer handler +enum hrtimer_restart check_variable_cb(struct hrtimer *timer) { + kernel_watch_timer *k_watch_timer = + container_of(timer, kernel_watch_timer, hr_timer); + int i = 0, j = 0; + int buffer[TIMER_MAX_WATCH_NUM]; // Buffer to store the messages + + // check all watched kernel_watch_arg + for (i = 0; i < k_watch_timer->sentinel; i++) { + if (read_and_compare(&k_watch_timer->k_watch_args[i])) { + // snprintf(buffer + strlen(buffer), sizeof(buffer) - strlen(buffer), " + // name: %s, threshold: %lld, pid: %d\n", + // k_watch_timer->k_watch_args[i].name, + // k_watch_timer->k_watch_args[i].threshold, + // k_watch_timer->k_watch_args[i].task_id); + buffer[j] = i; + j++; + + // printk(KERN_INFO "j: name %s, threshold: %lld\n", + // k_watch_timer->k_watch_args[i].name, + // k_watch_timer->k_watch_args[i].threshold); + // printk(KERN_INFO "j: %d\n", j); + } + } + if (j > 0) // if any threshold reached + { + printk("-------------------------------------\n"); + printk("-------------watch monitor-----------\n"); + printk("Threshold reached:\n"); + + for (i = 0; i < j; i++) { + printk(" name: %s, threshold: %lld, pid: %d\n", + k_watch_timer->k_watch_args[buffer[i]].name, //! todo + k_watch_timer->k_watch_args[buffer[i]].threshold, + k_watch_timer->k_watch_args[buffer[i]].task_id); + } + print_task_stack(); + // restart timer after 1s + hrtimer_forward(timer, timer->base->get_time(), ktime_set(1, 0)); //! todo + printk("-------------------------------------\n"); + } else { + // keep frequency + hrtimer_forward(timer, timer->base->get_time(), k_watch_timer->kt); + } + return HRTIMER_RESTART; // restart timer +} + +/// @brief start hrTimer +/// @param timeout: timeout in us +/// @return 0 is success +// int start_hrTimer(unsigned long timeout) +// { +// printk("HrTimer Start\n"); + +// kt = ktime_set(0, (unsigned long)timeout); // us -> ns +// // CLOCK_MONOTONIC: time since boot | HRTIMER_MODE_REL : relative time +// hrtimer_init(&hr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); +// hr_timer.function = check_variable_cb; +// // mode the same as hrtimer_init +// hrtimer_start(&hr_timer, kt, HRTIMER_MODE_REL); +// return 0; +// } + +/// @brief start all hrTimer +/// @param +void start_all_hrTimer(void) { + int i = 0; + kernel_watch_timer *timer = NULL; + for (i = 0; i < kernel_wtimer_num; i++) { + timer = &(kernel_wtimer_list[i]); + TIMER_START(timer); + } + printk("HrTimer start,module keep %d hrtimer for now\n", kernel_wtimer_num); +} + +/// @brief cancel hrTimer +/// @param +void cancel_all_hrTimer(void) { + int i = 0; + kernel_watch_timer *timer = NULL; + for (i = 0; i < kernel_wtimer_num; i++) { + timer = &(kernel_wtimer_list[i]); + TIMER_CANCEL(timer); + } + + printk("HrTimer cancel,module keep %d hrtimer for now\n", kernel_wtimer_num); +}
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