vmstat's entries type

[sthaug at nethelp.no]

> > One approach that we could use for 64-bit counters would be to just
> > use 32-bits one, and poll them for overflow and bump an overflow
> > count.  This assumes that the 32-bit counters overflow much less often
> > than the polling interval, and easily triples the amount of storage
> > for each of them...  It is ugly :-(
> > 
> 
> What's wrong with the add+adc (asm) approach found on any i386?

Presumably the fact that add + adc isn't an atomic operation. So if
you want to guarantee 64 bit consistency, you need locking or similar.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no