[uml-devel] how to "freeze" user mode linux

[uml-devel] how to "freeze" user mode linux

[siegfried]

hello everyone:

I am a new coder of embed linux app development .I use "User Mode Linux "
as host stimulator environment where our applications running  .now I have
a big problem !
I debug my code which are some processes/threads living in UML with gdb .
First, I make a break point on a process living in UML .Once I touch the
break point (this process/thread will be suspended)---BUT,other
process/thread are still in normal status .Soon ,these process/threads will
be suspended one after another because they are  waiting the feedback come
from the process/thread which are bing debugged .Unfortunately,when I
continue the process/threads, the process/thread can't return to the
orginial status because other processes /threads are in error status (time
out etc.)
How to "freeze" the whole "user mode linux" --all processes/threads in
"UML"and "UML" kernel even "UML" system timer!!!
and, how to recover it???




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Re: [uml-devel] how to "freeze" user mode linux

[Rob Landley]

On Tuesday 08 March 2005 02:45 am, siegfried@cosmobic.com wrote:
> hello everyone:
>
> I am a new coder of embed linux app development .I use "User Mode Linux "
> as host stimulator environment where our applications running  .now I have
> a big problem !
> I debug my code which are some processes/threads living in UML with gdb .
> First, I make a break point on a process living in UML .Once I touch the
> break point (this process/thread will be suspended)---BUT,other
> process/thread are still in normal status .Soon ,these process/threads will
> be suspended one after another because they are  waiting the feedback come
> from the process/thread which are bing debugged .Unfortunately,when I
> continue the process/threads, the process/thread can't return to the
> orginial status because other processes /threads are in error status (time
> out etc.)
> How to "freeze" the whole "user mode linux" --all processes/threads in
> "UML"and "UML" kernel even "UML" system timer!!!
> and, how to recover it???

Does swsusp work under UML? :)

Rob


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Re: [uml-devel] how to "freeze" user mode linux

[Blaisorblade]

On Tuesday 08 March 2005 17:13, Rob Landley wrote:
> On Tuesday 08 March 2005 02:45 am, siegfried@cosmobic.com wrote:
> > hello everyone:
> >
> > I am a new coder of embed linux app development .I use "User Mode Linux "
> > as host stimulator environment where our applications running  .now I
> > have a big problem !
> > I debug my code which are some processes/threads living in UML with gdb .
> > First, I make a break point on a process living in UML .Once I touch the
> > break point (this process/thread will be suspended)---BUT,other
> > process/thread are still in normal status .Soon ,these process/threads
> > will be suspended one after another because they are  waiting the
> > feedback come from the process/thread which are bing debugged
> > .Unfortunately,when I continue the process/threads, the process/thread
> > can't return to the orginial status because other processes /threads are
> > in error status (time out etc.)
> > How to "freeze" the whole "user mode linux" --all processes/threads in
> > "UML"and "UML" kernel even "UML" system timer!!!
> > and, how to recover it???
uml_mconsole <the umid of the instance>

To suspend a UML instance, at the prompt use "stop" and "go". I'm not at all 
sure you can gdb the UML instance meanwhile... but especially it will suspend 
any I/O you can do, and I think every process inside the UML instance, 
including gdb.

> Does swsusp work under UML? :)
Maybe, Nigel Cunningham, the developer of Swsusp 2 come by sometimes on this 
list.

For swsusp, I don't know at all what would be needed.
In the archives there was also an announce for a separate project for UML only 
to implement suspending in a UML-specific way (it was meaningful, but I don't 
remember about it, even because they wanted to run their own mainling list).
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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Re: [uml-devel] how to "freeze" user mode linux

[Erik Paulson]

On Wed, Mar 09, 2005 at 08:24:26PM +0100, Blaisorblade wrote:
>
> In the archives there was also an announce for a separate project for UML only 
> to implement suspending in a UML-specific way (it was meaningful, but I don't 
> remember about it, even because they wanted to run their own mainling list).
>

http://sbuml.sourceforge.net/

-Erik



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