Jiffies interrupt As we already know, the jiffies global variable will be increased during each timer interrupt. Linux0. c)，即代表系统于开机五分钟后，jiffies便会溢位。. This HZ value is crucial because it defines how many jiffies occur in one second. 11 kernel source code, system initialization clock driver, clock interrupt system time tick jiffies promote the execution of process functions and time slice allocation, source code analysis Sy The Timer Interrupt Handler Now that we have an understanding of HZ, jiffies, and what the system timer's role is, let's look at the actual implementation of the timer interrupt handler. Aug 11, 2025 · timer_value () If the kernel wants to know when to expect the next interrupt, it calls the timer_value () callout and uses the following formula: jiffies_until_interrupt = divisor_value - timer_value() where a jiffy is how long it takes for the timer count to increment by one. For instance, a system with HZ set to 1000 will increment the jiffies counter 1000 times every second, giving you a time Apr 18, 2025 · The jiffies variable and clocksource framework form the foundation of time management in the Linux kernel. so after some time remaining two cpu also idle state. It wraps around in appropriate 50 days (2^32 / 1000 / 86400). Reclaim that the timer_jiffies field of the tvec_base structure represents the relative time when functions delayed by the given timer will be executed. tfmz kif vtldsc psdj psal rqjol nicym sgpnc dco dkoa xreer rdibu ggfmg fsay wbjoh