From: bqt@update.uu.se (Johnny Billquist)
Subject: [TUHS] Emacs and undump
Date: Mon, 27 Feb 2017 22:06:10 +0100 [thread overview]
Message-ID: <d3652fe6-7e96-c97f-629a-b43ffbeee592@update.uu.se> (raw)
In-Reply-To: <86efyjpehy.fsf@molnjunk.nocrew.org>
On 2017-02-27 21:26, Lars Brinkhoff wrote:
> Johnny Billquist wrote:
>> But having the memory around for a program, even if it is not running,
>> is actually sometimes very useful. If ITS could handle that, while
>> treating them as separate processes, all associated to one terminal,
>> and let you select which one you were currently fooling around in,
>> while the others stayed around, that is something I don't think I've
>> seen elsewhere.
>
> And it's not just a list structure, but a tree. You can e.g. start a
> new DDT, which itself can have inferior jobs (subprocesses).
Hmm. That sounds similar to TOPS-20 then maybe.
>> So, Emacs does it once, and then saves the state at the point where
>> you can start editing. But it does not mean that the memory is
>> shareable. It's full of various data structures, and code, and that
>> will change as you go along editing things as well.
>
> Much is sharable. There's a concept of purification (which also comes
> from ITS). A purecopy() function is used in temacs to put read-only
> data in a special memory area. That area will become sharable in the
> dumped Emacs.
There are definitely some shareable things, but you need to remember
that even some pure, read-only data can be problematic in a shared
segment, as not all people might even have that data loaded, even if the
data itself is readonly.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
next prev parent reply other threads:[~2017-02-27 21:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.346.1488208394.3779.tuhs@minnie.tuhs.org>
2017-02-27 20:09 ` Johnny Billquist
2017-02-27 20:26 ` Lars Brinkhoff
2017-02-27 21:06 ` Johnny Billquist [this message]
[not found] <mailman.342.1488180370.3779.tuhs@minnie.tuhs.org>
2017-02-27 10:24 ` Johnny Billquist
2017-02-27 10:30 ` Lars Brinkhoff
2017-02-27 10:47 ` Johnny Billquist
2017-02-27 14:04 ` Arthur Krewat
2017-02-28 11:55 ` Ronald Natalie
[not found] <mailman.334.1488132096.3779.tuhs@minnie.tuhs.org>
2017-02-26 19:16 ` David
2017-02-26 19:28 ` Mantas Mikulėnas
2017-02-27 6:41 ` Tim Bradshaw
2017-02-27 7:19 ` Lars Brinkhoff
2017-02-27 7:26 ` Warner Losh
2017-02-27 8:12 ` Nick Downing
2017-02-27 14:33 ` Derek Fawcus
2017-02-27 14:50 ` Nick Downing
2017-02-27 15:43 ` Derek Fawcus
2017-02-27 16:43 ` Joerg Schilling
[not found] ` <CAH1jEzZjvOhHnbvsWcw8gbx9d_W47DbBidYd_tteCr5dC6H2ng@mail.gmail.com>
2017-02-28 0:02 ` Nick Downing
2017-02-27 12:59 ` tfb
2017-02-27 10:35 ` Joerg Schilling
2017-02-27 15:13 ` Tony Finch
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