Oh, I missed this thread...
>>>>> On Fri, 17 Feb 2006 10:46:53 -0800, john stultz <[email protected]> said:
>> In other places there is code that uses (jiffies - wall_jiffies).
>> However I can't see any way that jiffies and wall_jiffies could
>> ever be different (except for a few nanoseconds while executing the
>> code above). I also can't see any way that `ticks' could ever be
>> anything other than 1.
>>
>> Is the wall_jiffies stuff just a leftover from days when we used to
>> do timekeeping from a softirq? Or am I missing something
>> fundamental?
john> Its only use right now is that on some arches we increment
john> jiffies when we detect lost ticks. This then forces xtime to be
john> updated the appropriate number of times.
Currently, jiffies and wall_jiffies is _really_ different most of
time. The jiffies is almost always one bigger than wall_jiffies (at
least on i386 and MIPS). Please refer my yesterday's mail (subject:
jiffies_64 vs. jiffies) for the reason.
john> It probably could be killed and the arches can just call
john> do_timer() the appropriate number of times. That might clean
john> some things up. My TOD work would also make it unnecessary.
I just posted a patch to doing this (subject: [PATCH] simplify
update_times ...). I thought only x86_64 is doing such thing, right?
Also, I suppose then we can get rid of wall_jiffies completely.
---
Atsushi Nemoto
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