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Re: Removal of unexec support from glibc malloc
From: |
Eli Zaretskii |
Subject: |
Re: Removal of unexec support from glibc malloc |
Date: |
Sat, 23 Jan 2016 09:00:56 +0200 |
> From: Stefan Monnier <address@hidden>
> Date: Sat, 23 Jan 2016 00:49:02 -0500
> Cc: address@hidden
>
> >> This is less of a problem if Emacs never frees a pointer after dump that
> >> it has allocated before dump. But I think this can happen (otherwise,
> >> all this would be quite easy to address).
> > Yes, it can and does happen, although not much.
>
> Indeed. This said, it'd make sense to try and avoid doing it.
AFAICS, it happens due to the following:
. We call regex.c functions, which reuse an allocated buffer,
extending it (via realloc) as needed; that buffer gets frozen with
malloc arena used during dumping
. We delete the terminal frame used by temacs and free its resources
. Not 100% sure, but I think we also release/reallocate some
font-related stuff
It's easy to catch all those cases by setting a breakpoint on realloc
and free during startup.
- Re: Removal of unexec support from glibc malloc, (continued)
- Re: Removal of unexec support from glibc malloc, Paul Eggert, 2016/01/18
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/18
- Re: Removal of unexec support from glibc malloc, Paul Eggert, 2016/01/19
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/19
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/19
- Re: Removal of unexec support from glibc malloc, Wolfgang Jenkner, 2016/01/19
- Re: Removal of unexec support from glibc malloc, Eli Zaretskii, 2016/01/19
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/18
- Re: Removal of unexec support from glibc malloc, Eli Zaretskii, 2016/01/18
- Re: Removal of unexec support from glibc malloc, Stefan Monnier, 2016/01/23
- Re: Removal of unexec support from glibc malloc,
Eli Zaretskii <=
- Re: Removal of unexec support from glibc malloc, Stefan Monnier, 2016/01/23
- Re: Removal of unexec support from glibc malloc, Eli Zaretskii, 2016/01/23
- Re: Removal of unexec support from glibc malloc, Stefan Monnier, 2016/01/23
- Re: Removal of unexec support from glibc malloc, Richard Stallman, 2016/01/23
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/26
- Re: Removal of unexec support from glibc malloc, Stefan Monnier, 2016/01/26
- Re: Removal of unexec support from glibc malloc, Eli Zaretskii, 2016/01/26
- Re: Removal of unexec support from glibc malloc, Florian Weimer, 2016/01/27
- Re: Removal of unexec support from glibc malloc, Eli Zaretskii, 2016/01/27
- Re: Removal of unexec support from glibc malloc, Richard Stallman, 2016/01/27