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bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architect

From: Paul Eggert
Subject: bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architecture
Date: Wed, 9 Nov 2016 17:40:17 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/09/2016 04:22 PM, Richard Stallman wrote:
The point of memory-limit was to enable features useful for users.
If memory-limit doesn't work any more, those features don't either.

What exactly were those features?  What problems did they help
users deal with?
I assume memory-limit was an attempt to let Lisp code diagnose when memory was getting low in Emacs, circa 1992. The memory-limit function was added in commit 20d2471455526acfd5fe96681ea31f0eac88fae4 by Jim Blandy on 1992-10-03. As far as I can see the function was never successful, in the sense that this part of the code was being developed at the time and that Emacs eventually used other methods (e.g., calls from C to sbrk (0)) to get the information that memory-limit was returning.
Are they completely unnecessary now?  If not, can we make them
function again?  Or provide other features to deal with the same

This particular feature, whatever it was, seems to have become unnecessary in late 1992, soon after it was added.

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