On Tue, 2004-08-31 at 12:27, George Anzinger wrote:
Tim Schmielau wrote:
On Mon, 30 Aug 2004, john stultz wrote:
On Mon, 2004-08-30 at 16:00, Tim Schmielau wrote:
George, please excuse my lack of understanding. What again where the
precise reasons to have an ntp-corrected uptime?
Ah, here's the thread with the first mention of it that I could find.
http://www.uwsg.iu.edu/hypermail/linux/kernel/0306.1/1471.html
As I recall the problem was that jiffies since boot was being converted to get uptime base on 1/HZ = 1 jiffie. Since it is really not quite that, there was an error. Using clock_monotonic seemed like the right answer as it eliminated the error AND made the result consistant with get_clock(CLOCK_MONOTONIC,..).
The alternate answer is, of course, to directly convert the elapsed jiffies. The main problem with this is that this can be a BIG number and, therefor, the math needs to be carefully. And, of course, it is inconsistant with get_clock(), but that is a new interface...
Hmmm. Well, I may be starting to lean in Tim's direction of pulling the
clock_monotonic based uptime and going back to the jiffies based uptime.
Atleast until we can make all the /proc/ output consistent.
I just worry that it actually fixed a problem for someone, and backing
it out would just reopen that.
Thoughts?