I mean, a couple paragraphs down, the article says: > The solution here is to have a dynamic tick so that when the CPU is idle, the timer interrupt is either d

I mean, a couple paragraphs down, the article says: > The solution here is to have a dynamic tick so that when the CPU is idle, the timer interrupt is either deactivated or reprogrammed to happen at a point where the kernel knows there will be work to do (for example, a process might have a timer expiring in 5 seconds, so we must not sleep past that). This is also called tickless mode.