On Wed, May 26, 2021 at 05:02:52AM +1000, matthew green wrote: > > > +options HZ=8000 > this can become a problem due to integer division. > > any number of ticks less than hz (8000) will be rounded > down to 0 in a number of places now, where as before it > was only less than 100. i've seen this trip up in the > kernel before, and sometimes that '0' means 'poll', and > sometimes it means 'sleep forever'.
> a lot of places in the kernel *do* avoid (eg, with adding > hz-1 and then dividing by hz) but there are a number that > do not... So, should we introduce a CPP macro or an inline function that abstracts the common code away in a way that avoids such rounding down and produces correct results? --chris
