Hello. Thomas Gleixner wrote:
The PIT can only be used as a clock source, when it is in periodic mode, but it is never continuous. If we miss one PIT interrupt the time keeping is hosed.
OK, thank you and Daniel for the explanations about the flag, but now to the problem. Before hrtimer_switch_to_hres() is called, the check for timekeeping_is_continuous() is performed in tick_ckeck_oneshot_change(), and that check fails (by adding a flag I compel it to succeed). With that check failing, hrtimer_switch_to_hres() is never called, and the hrtimers do not work. That's why I posted that patch, but what would be the right way of getting the hrtimers to work? /proc/timer_list lists only the pit timesource. If I enable lapic then it is also listed, yet it doesn't help at all.
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