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bug#31852: Make memory-limit obsolete

From: Paul Eggert
Subject: bug#31852: Make memory-limit obsolete
Date: Sat, 16 Jun 2018 09:27:30 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

Daniel Colascione wrote:
I agree with obsoleting memory-limit. I don't like the vsize patch you
installed though: what does the amount of address space reserved actually
tell anyone? There's no relationship to actual resource consumption.

It's not that good a number, true; but it's better than the number we were returning, which was typically nonsense.

One of the benefits of moving memory-limit to Lisp was the removal of the bogus call to sbrk. Emacs should never call sbrk, and once the portable dumper code is merged, Emacs won't ever need to call sbrk again. Yay!

All things considered, I'd rather not go down the rabbit hole of trying to improve memory-limit further, because memory-limit was a mistake in the first place and nobody uses it (and rightly so) and we should be deprecating it rather than trying to improve it. That being said, if you'd like to make it better please feel free.

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