Re: [PATCH] Fix jiffies_to_time[spec | val] and converse to use actual
george anzinger (george@mvista.com)
Tue, 15 Apr 2003 02:25:12 -0700
Russell King wrote:
> On Tue, Apr 15, 2003 at 01:36:46AM -0700, george anzinger wrote:
>
>>In the current system (2.5.67) time_spec to jiffies, time_val to
>>jiffies and the converse (jiffies to time_val and jiffies to
>>time_spec) all use 1/HZ as the measure of a jiffie. Because of the
>>inability of the PIT to actually generate an accurate 1/HZ interrupt,
>>the wall clock is updated with a more accurate value (999848
>>nanoseconds per jiffie for HZ = 1000).
>
>
> There's an increasing amount of 64-bit math appearing here, which gcc
> has been historically bad with. Is there any chance that all this
> extra complexity can vanish for architectures which do not have this
> problem?
I suppose that is possible. On the other hand, the only 64-bit things
we leave to C are the "+" and shift.
>
--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
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