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proc/stat.c // 整个CPU所有的进程占用率分析
proc/array.c // CPU进程占用率Jiffies = Ns / (10^9 / HZ)
int do_task_stat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task, int whole){ thread_group_times(task, &utime, &stime); =>void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st) { thread_group_cputime(p, &cputime); total = cputime_add(cputime.utime, cputime.stime); rtime = nsecs_to_cputime(cputime.sum_exec_runtime); =># define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs) unsigned long nsecs_to_jiffies(u64 n) { return (unsigned long)nsecs_to_jiffies64(n); =>u64 nsecs_to_jiffies64(u64 n) { #if (NSEC_PER_SEC % HZ) == 0 /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */ return div_u64(n, NSEC_PER_SEC / HZ); #else #endif } }} Linux下如何查看高CPU占用率线程 LINUX CPU利用率计算
https://www.cnblogs.com/lidabo/p/4738113.htmllinux内核中的HZ介绍
https://blog.csdn.net/hzrandd/article/details/10850043