Re: [PATCH] mm: add ratio in slabinfo print

From: David Rientjes
Date: Mon Jan 11 2016 - 19:21:03 EST

On Mon, 11 Jan 2016, Xishi Qiu wrote:

> > On Mon 11-01-16 11:54:57, Xishi Qiu wrote:
> >> Add ratio(active_objs/num_objs) in /proc/slabinfo, it is used to show
> >> the availability factor in each slab.
> >
> > What is the reason to add such a new value when it can be trivially
> > calculated from the userspace?
> >
> > Besides that such a change would break existing parsers no?
> Oh, maybe it is.

If you need the information internally, you could always create a library
around slabinfo and export the information for users who are interested
for your own use. Doing anything other than appending fields to each line
is too dangerous, however, as a general rule.