lat (nsec) : 500=0.01%, 750=0.01% lat (usec) : 10=0.01%, 20=98.29%, 50=1.69%, 100=0.01%, 250=0.01% lat (usec) : 500=0.01%, 1000=0.01% lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 100=0.01% cpu : usr=8.33%, sys=27.32%, ctx=1048761, majf=0, minf=13 IO depths :...
cpu_base->max_hang_time = (unsignedint) delta.tv64;/** Limit it to a sensible value as we enforce a longer * delay. Give the CPU at least 100ms to catch up.*/if(delta.tv64 >100*NSEC_PER_MSEC) expires_next= ktime_add_ns(now,100*NSEC_PER_MSEC);elseexpires_next=ktime_add(n...
if (delta.tv64 > 100 * NSEC_PER_MSEC) expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC); else expires_next = ktime_add(now, delta); tick_program_event(expires_next, 1); printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n", ktime_to_ns(delta)); } 如果这时的ti...
*/ if (delta > 100 * NSEC_PER_MSEC) expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC); else expires_next = ktime_add(now, delta); /* 对定时事件设备进行强制编程 */ tick_program_event(expires_next, 1); pr_warn_once("hrtimer: interrupt took %llu ns\n", ktime_to_ns(de...
+ (end.tv_nsec - begin.tv_nsec)) static unsigned long g_load_per_slice; static struct timespec g_time_begin; static unsigned long estimate_loops_per_msec() { struct timespec begin = {0}; struct timespec end = {0}; unsigned long i = 0; ...
if (delta.tv64 > 100 * NSEC_PER_MSEC) expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC); else expires_next = ktime_add(now, delta); tick_program_event(expires_next, 1); printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n", ...
tv.tv_nsec / NSEC_PER_MSEC); icmp_param.data.times[2] = icmp_param.data.times[1]; if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4)) BUG(); 前面已经说过,icmp_param就是要发送ICMP报文的内容,上面设置了内容,接下来设置报头,同样是直接拷贝 了ICMP请求的报头,改变type为ICMP_TIME...
void start_hrtimer_example(void) { hrtimer_start(&my_hrtimer, ktime_set(0, NSEC_PER_MSEC * 1000), HRTIMER_MODE_REL); } 步骤五:取消高精度定时器(可选) c void cancel_hrtimer_example(void) { hrtimer_cancel(&my_hrtimer); } 4. Linux内核高精度定时器的应用场景 高精度定时器在...
NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC)); } ret = do_sys_poll(ufds, nfds, to); …… 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. SYSCALL_DEFINE3是一个宏,它定义于include/linux/syscalls.h,展开后就有sys_poll函数。
NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC)); } ret = do_sys_poll(ufds, nfds, to); if (ret == -EINTR) { struct restart_block *restart_block; restart_block = ¤t->restart_block; restart_block->fn = do_restart_poll; ...