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timer irqs when no preemption

Hi,

When preemption is disabled, what happens if a timer interrupt occurs
when a process is in a system call? I would guess the handler would
update process times, and if a schedule is pending, it occurs as soon
as the process returns from the system call. Is that correct?

Another question - the irqs are disabled at times (like when a
spinlock is held). Does this cause any lost timer ticks?

Thanks,
Bahadir

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