On Fri, Sep 29, 2006 at 06:43:04AM -0700, John Zavgren wrote:
> Now, I understand that its good to make the date command cheat, because
> then, each UML host will know the correct time of day. This is good
> because it eliminates the hassle of setting the clock offset in each
> UML host. In my case, this convenience is a big problem.
>
> So, how does one disable this cheating?
I described how to do this already. Here's one way to do it:
Make um_timer() remember the last time it was called and set
local_offset as follows:
unsigned long long last_time;
irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
{
...
current = get_time();
local_offset -= 9 * (current - last_time) / 10;
last_time = current;
...
}
If my thinking is correct, this will make the timer subtract off 90%
of the time since the last tick.
This won't affect what you've already done to jiffies, since timer_irq
calls os_nsecs directly (and thus its elapsed time doesn't take
local_offset into account, as it shouldn't).
Jeff
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