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    SubjectRe: [PATCH] Re: boot time, process start time, and NOW time
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    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?

    -john


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