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Re: Preview: portable dumper

From: Daniel Colascione
Subject: Re: Preview: portable dumper
Date: Thu, 1 Dec 2016 09:35:29 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 12/01/2016 09:26 AM, Eli Zaretskii wrote:
Cc: address@hidden, address@hidden, address@hidden
From: Paul Eggert <address@hidden>
Date: Thu, 1 Dec 2016 01:16:17 -0800

    Emacs never worked on that platform

Sure it did. Emacs worked until FreeBSD 11, when the arm64 port modernized its 
memory-management implementation.

From https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24892#104

  Ed Maste wrote:
  > arm64 support was first available in a release in FreeBSD 11.0, without 
sbrk, and sbrk never existed on the stable/11 branch.

  Thanks, I didn't know that. So Emacs has never worked in this environment.

Doesn't that mean Emacs on arm64 was never available before FreeBSD
11, and sbrk never existed on FreeBSD/arm64?

    they removed a certain library function, which happens to be called by 

This was no accident. They removed it because it was producing bogus values, 
and it didn't reflect how FreeBSD actually allocates memory.

And they are thinking on bringing it back, see

They shouldn't bring it back. Reserving a single region in a process as "the heap" and doling out parts of it via mmap is an inflexible allocation policy. mmap ought to be the only way to get memory from the system.

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