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Re: GC and stack marking
From: |
Eli Zaretskii |
Subject: |
Re: GC and stack marking |
Date: |
Wed, 21 May 2014 19:53:30 +0300 |
> Date: Wed, 21 May 2014 19:57:42 +0400
> From: Dmitry Antipov <address@hidden>
> CC: Stefan Monnier <address@hidden>,
> address@hidden, address@hidden
>
> On 05/21/2014 07:39 PM, Eli Zaretskii wrote:
>
> > Now, I have a question: mark_stack stops examining the stack when it
> > gets to its own stack frame. That is certainly safe, but it sounds
> > too conservative: it should stop at the stack frame of
> > Fgarbage_collect, I think, because no live Lisp object can appear
> > while Fgarbage_collect runs, right?
>
> 1) Yes, but you need ABI- and machine-specific tricks to find the stack frame
> boundaries. I.e.
> while in mark_stack, there is no easy way to find start and end of
> Fgarbage_collect's stack frame.
I thought of passing that to mark_stack as argument when
Fgarbage_collect calls it. That should work as well as what we do in
mark_stack to find its own stack frame, no?
> 3) But even if 2) works on all platforms we have to support, I don't see a
> reasons to complicate
> GC just to avoid scanning a few tens of bytes of an extra stack frame.
The issue discussed in this thread _is_ that reason: we are dumping
Emacs with a dead object, for no good reason, and that object is quite
large (around 1MB).
- Re: GC and stack marking, (continued)
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
- Re: GC and stack marking, Stefan Monnier, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
- Re: GC and stack marking, Stefan Monnier, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
- Re: GC and stack marking, Stefan Monnier, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/21
- Re: GC and stack marking, Dmitry Antipov, 2014/05/21
- Re: GC and stack marking, Dmitry Antipov, 2014/05/21
- Re: GC and stack marking, Eli Zaretskii, 2014/05/21
- Re: GC and stack marking,
Eli Zaretskii <=
- Re: GC and stack marking, Stefan Monnier, 2014/05/21
- Re: GC and stack marking, Eli Zaretskii, 2014/05/21
- Re: GC and stack marking, Eli Zaretskii, 2014/05/22
- Re: GC and stack marking, Stefan Monnier, 2014/05/22
- Re: GC and stack marking, Eli Zaretskii, 2014/05/24
- Re: GC and stack marking, Daniel Colascione, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
- Re: GC and stack marking, Stefan Monnier, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
Re: GC and stack marking, Florian Weimer, 2014/05/31