From: Daniel Colascione <dancol@dancol.org>
To: Philipp Stephani <p.stephani2@gmail.com>,
Eli Zaretskii <eliz@gnu.org>, Paul Eggert <eggert@cs.ucla.edu>
Cc: fweimer@redhat.com, Emacs-devel@gnu.org
Subject: Re: Removal of unexec support from glibc malloc
Date: Mon, 18 Jan 2016 14:12:21 -0800 [thread overview]
Message-ID: <569D6345.1090805@dancol.org> (raw)
In-Reply-To: <CAArVCkRK-V33kbSYjtGCRRUYzNX5QHz3=M=pU-wkVrBquZBgLA@mail.gmail.com>
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On 01/18/2016 02:10 PM, Philipp Stephani wrote:
>
>
> Daniel Colascione <dancol@dancol.org <mailto:dancol@dancol.org>> schrieb
> am Mo., 18. Jan. 2016 um 21:05 Uhr:
>
> On 01/18/2016 12:02 PM, Eli Zaretskii wrote:
> >> From: Paul Eggert <eggert@cs.ucla.edu <mailto:eggert@cs.ucla.edu>>
> >> Date: Mon, 18 Jan 2016 11:50:31 -0800
> >>
> >> Emacs could live without the current unexec in a semi-portable
> way by doing what
> >> XEmacs does, which is to write out data and mmap it in later
> (sorry, don't know
> >> the details). There are other possibilities, e.g., have unexec
> write out the
> >> state in the form of C files that are compiled and linked in the
> usual way to
> >> build a faster-starting executable (this would be an Emacs API
> change, though).
> >> Any such changes would take some time to hack into something
> reliable and
> >> portable, and so will have to wait until after Emacs 25 is out.
> >
> > There's also what the MS-Windows port does (temacs allocates off a
> > static array), which AFAIK is entirely portable, and doesn't require
> > mmap. See w32heap.c.
> >
>
> It's a portable stopgap, maybe, but a real portable dumper would be
> _much_ better, since then Emacs could be a much safer
> position-independnent executable (as a portable dumper would relocate
> the dump as it loads, since it knows where all the pointers are).
>
>
> I completely agree. Also see the existing bugs
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20215 and
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20868.
> Does anybody have a rough estimate what would be required to make the
> dumper really portable?
I think it depends on how much we depend on non-lisp malloc-sourced
memory allocations. I honestly don't know.
As long as we're talking about work to do: I'd love for the new portable
dumper to support dumping Emacs multiple times. I've had to put a lot of
effort into my configuration to get Emacs to start in an acceptable
time, and a lot of people tolerate multi-second Emacs startup times.
It'd be nice if we could dump Emacs after loading user customizations.
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next prev parent reply other threads:[~2016-01-18 22:12 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-18 12:33 Removal of unexec support from glibc malloc Florian Weimer
2016-01-18 19:20 ` John Wiegley
2016-01-18 20:27 ` Florian Weimer
2016-01-19 13:52 ` Should Glibc API be changed? Richard Stallman
2016-01-19 16:40 ` Florian Weimer
2016-01-20 2:56 ` Richard Stallman
2016-01-20 17:07 ` Florian Weimer
2016-01-23 5:56 ` Removal of unexec support from glibc malloc Stefan Monnier
2016-01-26 22:08 ` Florian Weimer
2016-01-18 22:45 ` Ali Bahrami
2016-01-18 23:45 ` John Wiegley
2016-01-19 0:45 ` Wolfgang Jenkner
2016-01-19 0:56 ` Ali Bahrami
2016-01-19 1:14 ` Dmitry Gutov
2016-01-19 1:44 ` Ken Raeburn
2016-01-19 1:59 ` Dmitry Gutov
2016-01-19 3:10 ` Ken Raeburn
2016-01-19 3:17 ` Dmitry Gutov
2016-01-19 7:03 ` Florian Weimer
2016-01-19 8:36 ` Ken Raeburn
2016-01-19 16:42 ` Eli Zaretskii
2016-01-19 1:45 ` Ali Bahrami
2016-01-19 2:03 ` Dmitry Gutov
2016-01-19 16:04 ` Eli Zaretskii
2016-01-20 2:57 ` Richard Stallman
2016-01-20 7:43 ` David Caldwell
2016-01-20 9:35 ` Eli Zaretskii
2016-01-21 3:01 ` Richard Stallman
2016-01-21 3:00 ` Richard Stallman
2016-01-19 15:58 ` Eli Zaretskii
2016-01-19 20:37 ` Fabrice Popineau
2016-01-20 2:56 ` Richard Stallman
2016-01-23 13:51 ` Michael Sperber
2016-01-23 20:36 ` Marcus Crestani
2016-01-19 23:53 ` Sam Steingold
2016-01-18 19:24 ` Paul Eggert
2016-01-18 19:30 ` John Wiegley
2016-01-18 19:47 ` Daniel Colascione
2016-01-18 19:54 ` Zack Weinberg
2016-01-18 19:55 ` Daniel Colascione
2016-01-18 22:27 ` Joseph Myers
2016-01-18 23:16 ` Florian Weimer
2016-01-18 19:50 ` Paul Eggert
2016-01-18 19:54 ` Daniel Colascione
2016-01-18 20:02 ` Eli Zaretskii
2016-01-18 20:05 ` Daniel Colascione
2016-01-18 22:10 ` Philipp Stephani
2016-01-18 22:12 ` Daniel Colascione [this message]
2016-01-18 22:36 ` Óscar Fuentes
2016-01-23 5:50 ` Stefan Monnier
2016-01-18 20:24 ` Wolfgang Jenkner
2016-01-18 20:29 ` Eli Zaretskii
2016-01-18 20:36 ` Wolfgang Jenkner
2016-01-18 22:42 ` Paul Eggert
2016-01-18 23:23 ` Florian Weimer
2016-01-19 6:31 ` Paul Eggert
2016-01-19 9:27 ` Florian Weimer
2016-01-19 10:14 ` Florian Weimer
2016-01-19 13:27 ` Wolfgang Jenkner
2016-01-19 16:58 ` Eli Zaretskii
2016-01-30 9:38 ` Paul Eggert
2016-01-18 22:44 ` Florian Weimer
2016-01-19 3:48 ` Eli Zaretskii
2016-01-23 5:49 ` Stefan Monnier
2016-01-23 7:00 ` Eli Zaretskii
2016-01-23 15:29 ` Stefan Monnier
2016-01-23 15:50 ` Eli Zaretskii
2016-01-23 22:19 ` Stefan Monnier
2016-01-23 22:52 ` Richard Stallman
2016-01-26 22:17 ` Florian Weimer
2016-01-27 1:32 ` Stefan Monnier
2016-01-27 3:38 ` Eli Zaretskii
2016-01-27 9:04 ` Florian Weimer
2016-01-27 16:02 ` Eli Zaretskii
2016-01-27 22:54 ` Richard Stallman
2016-01-27 22:52 ` Richard Stallman
2016-01-18 23:15 ` Florian Weimer
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