Re: MSEC_TO_JIFFIES is messed up...

[Paul Wagland]

On May 13, 2004, at 21:11, Andrew Morton wrote:

> Paul Wagland <paul@xxxxxxxxxxx> wrote:
> >  This changes behaviour when HZ==(z)000
> >
> >  JIFFIES_TO_MSECS  goes from
> >  ((x) * 1000) / (z)000  to (((x) + (z) - 1)/(z))
> >
> >  i.e. for x=1, z=2 this goes from ((1)*1000)/2000)=0 to 
> > (((1)+(2)-1)/2)=1
>
> hm, so you're saying that we now round 0.5 up to 1 rather than down to 
> zero?

More precisely, we round .x up, where before it was rounded down, but 
yeah, _and_ only when HZ is a multiple of 1000, and greater than 1000. 
This is also only the case for the patch as proposed by wli, currently 
I don't know of any architectures that have a HZ of 2000 or more... but 
I just note that it _is_ a behaviour change in those cases, whether or 
not it is important is for other people to decide :-)

Cheers,
Paul

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