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Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109111: Simple free memory accou

From: Dmitry Antipov
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109111: Simple free memory accounting feature.
Date: Tue, 17 Jul 2012 17:40:39 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120614 Thunderbird/13.0.1

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.


Attachment: gc.patch
Description: Text document

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