On 07/17/2012 01:45 PM, Stefan Monnier wrote:

> There are two problems, here:
> - if the data is unavailable, better return nil than 0.
> - we now have 2 ways to get the data, neither of which gives it all:
>    garbage-collect returns details data but misses the new vector-bytes
>    and bytes-free, whereas memory-free includes those 2 but only provides
>    the combined value.
>
> The first problem is obviously a detail, but the second problem needs to
> be fixed.  The way I see it, it should be fixed by improving
> garbage-collect's return value.  The only problem with that is backward
> compatibility, but AFAIK there are only 2 users of that data:
> memory-usage and chart.el, which we can both fix easily.
> I suggest we make garbage-collect return its data in a new format
> that is more self-descriptive, like an alist where each entry takes the
> form (CATEGORY SIZE USED FREE), where CATEGORY would be a symbol (like
> `cons') and SIZE is the size of each element in bytes.

OK, look at this.

Dmitry