Hi,
I am looking at David Mills' code for "Precision timekeeping", which, as
I understand is the base for the design of Linux timekeeping, and I have
a few questions about design of time.c and timer.c:
1) In David Mills' (DM) code the analog of tsc_quotient is recalculated
every second to allow for variations in the size of a tick. In Linux it
is determined once at boot. Why?
2) In DM there is a check to insure that gettimeofday is always
monotone, it is absent in Linux. Why? I don't see how Linux design
enforces monotonicty if there was a change of xtime inbetween two
gettimeofday() calls.
3) Why do we call set_rtc_mmss() in do_timer_interrupt() and not in BH?
Thanks,
Boris
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