Re: Jiffy based timers/timeouts can expire too soon.

[Chris Friesen]

David Vrabel wrote:
> Hi,
>
> Jiffy based timers and timeouts can expire too soon because the timer 
> interrupt accounts for lost ticks and can increment jiffies by more than 1.

On the other hand, you also need to account for lost ticks for timers that 
started before interrupts were turned off, otherwise they could run for extra time.

It would be nice to have some kind of constant frequency timestamp that 
increments regardless of sleep state or interrupt status, so that sleep periods 
and such are based on timestamps rather than ticks (the period of which can vary).

Chris

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/