Process record and replay checked in to main trunk

Process record and replay checked in to main trunk

[Hui Zhu]

Hi guys,

Process record and replay make gdb can record inferior execute log and
replay (include reverse debug).
Now, it support I386-Linux single-thread single-inferior native debug.


It was checked in today.
Thanks for evey people that spent time on process record.  Precord
can't be a part of gdb without your help.  Thank you very much.  :)


And precord still has a long way to go.  There have a lot of thing need to do:

1. Support i386 more better.  Now, precord doesn't support mmx insns,
support fp insns not very well and doesn't support a lot of insns.

2. Support more arches.  X86-64 is the first one (linux-record.c).
MIPS, ARM and so on.

3. Support memory free better.  Now, precord just can output a warning
for memumap.  It can do nothing when there is a sys_brk to free the
memory.
I had make a patch to output a warning when there is a sys_brk to free
the memory and make a plan to make precord can support free memory.
I will keep work on it.

4. Support multi-thread and multi-inferior.
I remember Pedro make a patch for reverse debug resume.  I think we
need this patch when multi-inferior check in.

5. Make record speed up and need less memory.
I have made a plan to make p record doesn't record execution log of
some functions (It can set), for example some functions in glibc.

6. Make execution log can dump out to be a file and can replay for next time.
Maybe it can make together with coredump support.  It must be a cool
function.  :)

Guys, please work on it if you interesting with some of them.  And
feel free tell me your ideas and comments.  It will help precord a
lot.


Thanks,
Hui

Re: Process record and replay checked in to main trunk

[Thiago Jung Bauermann]

Hi Hui,

El jue, 30-04-2009 a las 16:02 +0800, Hui Zhu escribió:
> It was checked in today.
> Thanks for evey people that spent time on process record.  Precord
> can't be a part of gdb without your help.  Thank you very much.  :)

Congratulations! And thanks for your perseverance in getting this
functionality accepted! It was certainly no easy task, unfortunately.

My only regret is not having helped you more with this (in fact, I only
helped a little bit). For better or worse, all my GDB-related energy has
been directed to getting the Python branch merged in...

> And precord still has a long way to go.  There have a lot of thing need to do:

Thanks for this road map. IMHO this is the kind of thing that could go
on the wiki. In fact, I just added it under:

http://sourceware.org/gdb/wiki/ReversibleDebugging
-- 
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center

Re: Process record and replay checked in to main trunk

[Hui Zhu]

>
>> And precord still has a long way to go.  There have a lot of thing need to do:
>
> Thanks for this road map. IMHO this is the kind of thing that could go
> on the wiki. In fact, I just added it under:
>
> http://sourceware.org/gdb/wiki/ReversibleDebugging

Thanks Thiago.

I added 2 items to this wiki.  There are about doc and testsuite.

Thanks,
Hui

Re: Process record and replay checked in to main trunk

[paawan oza]

Hi Hui,
As we have already discussed,
I would like to contribute in improving point 1 for reversible debugging.
1) bringing in mmx instruction support.
2) floating point insn improvement/support.
In addition to that, I will further analyze how we can improve on any other
insn suport which are not good enough.
Thank you,
Oza.

--- On Sun, 5/3/09, Hui Zhu <teawater@gmail.com> wrote:

From: Hui Zhu <teawater@gmail.com>
Subject: Re: Process record and replay checked in to main trunk
To: "Thiago Jung Bauermann" <bauerman@br.ibm.com>
Cc: "gdb ml" <gdb@sourceware.org>, "Pedro Alves" <pedro@codesourcery.com>, "Marc Khouzam" <marc.khouzam@ericsson.com>, "Michael Snyder" <msnyder@vmware.com>, "Eli Zaretskii" <eliz@gnu.org>, "Mark Kettenis" <mark.kettenis@xs4all.nl>
Date: Sunday, May 3, 2009, 9:24 PM

>
>> And precord still has a long way to go.  There have a lot of thing need to do:
>
> Thanks for this road map. IMHO this is the kind of thing that could go
> on the wiki. In fact, I just added it under:
>
> http://sourceware.org/gdb/wiki/ReversibleDebugging

Thanks Thiago.

I added 2 items to this wiki.  There are about doc and testsuite.

Thanks,
Hui