From: Florian Weimer <fw@deneb.enyo.de>
To: Gary Benson <gbenson@redhat.com>
Cc: Mark Kettenis <mark.kettenis@xs4all.nl>, gdb-patches@sourceware.org
Subject: Re: [PATCH 0/2] Demangler crash handler
Date: Tue, 13 May 2014 18:22:00 -0000 [thread overview]
Message-ID: <87ppjhilni.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <20140513102223.GC17805@blade.nx> (Gary Benson's message of "Tue, 13 May 2014 11:22:23 +0100")
* Gary Benson:
>> It would be more reliable to run the demangler in a separate
>> process.
>
> Agreed. There are two issues though. First is performance:
> GDB can demangle a lot of symbols--starting GDB on LibreOffice
> demangles more than 369,000 symbols on my machine, and typing
> "b <Tab><Tab>" demangles 2,740,000 more--so the IPC overhead
> has to be seriously low.
Is most of the demangling of the bulk kind? These cases are easy in
the sense that a ping-pong between the two processes is avoidable.
More worrisome would be the occasional demangling as part of other
tasks, where the context switches might become very visible.
>> What's so difficult about fixing the demangler?
>
> It's not so difficult really, but fixes take time to diagnose,
> reproduce, fix, test, review, etc.
I was referring to a more permanent fix, not just patching the bug of
the day as users encounter it.
> During that interval the user cannot use GDB to debug their program.
> This patch is about allowing the user the possibility of getting
> their work done.
I suppose I could run the demangler on all symbols in Fedora and
downstream and see what breaks. Would that help?
next prev parent reply other threads:[~2014-05-13 18:22 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 10:07 Gary Benson
2014-05-09 10:09 ` [PATCH 1/2] " Gary Benson
2014-05-09 10:10 ` [PATCH 2/2] " Gary Benson
2014-05-09 11:20 ` [PATCH 0/2] " Mark Kettenis
2014-05-09 15:33 ` Gary Benson
2014-05-11 5:17 ` Doug Evans
2014-05-13 10:20 ` Gary Benson
2014-05-13 19:29 ` Tom Tromey
2014-05-14 13:07 ` Gary Benson
2014-05-13 19:39 ` Tom Tromey
2014-05-14 9:15 ` Gary Benson
2014-05-11 20:23 ` Mark Kettenis
2014-05-13 10:21 ` Gary Benson
2014-05-13 16:05 ` Pedro Alves
2014-05-15 13:24 ` Gary Benson
2014-05-15 14:07 ` Pedro Alves
2014-05-15 14:28 ` Gary Benson
2014-05-15 15:25 ` Pedro Alves
2014-05-16 11:06 ` Pedro Alves
2014-05-10 20:55 ` Florian Weimer
2014-05-11 5:10 ` Doug Evans
2014-05-13 10:22 ` Gary Benson
2014-05-13 18:22 ` Florian Weimer [this message]
2014-05-13 18:42 ` Pedro Alves
2014-05-13 19:16 ` Gary Benson
2014-05-13 19:19 ` Pedro Alves
2014-05-14 9:11 ` Gary Benson
2014-05-13 19:20 ` Florian Weimer
2014-05-13 19:22 ` Pedro Alves
2014-05-13 19:22 ` Gary Benson
2014-05-13 19:36 ` Tom Tromey
2014-05-14 9:13 ` Gary Benson
2014-05-14 14:18 ` Pedro Alves
2014-05-14 16:08 ` Andrew Burgess
2014-05-14 18:32 ` Pedro Alves
2014-05-15 13:25 ` Gary Benson
2014-05-15 16:01 ` Pedro Alves
2014-05-15 13:27 ` Gary Benson
2014-05-20 17:05 ` Tom Tromey
2014-05-20 18:40 ` Stan Shebs
2014-05-20 19:36 ` Tom Tromey
2014-05-20 20:23 ` Joel Brobecker
2014-05-22 12:56 ` Gary Benson
2014-05-22 13:09 ` Joel Brobecker
2014-05-22 14:13 ` Pedro Alves
2014-05-22 15:57 ` Gary Benson
2014-05-22 13:18 ` Gary Benson
2014-05-22 14:09 ` Gary Benson
2014-05-22 14:40 ` Mark Kettenis
2014-05-22 20:42 ` Gary Benson
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