Re: Linux Realtime Scheduling Option

[David Steven Trollope <trollope@lucent.com>]

Hi Daniel,

Our application does change its own priority, but I was concerned with 
the priority of gdbserver/gdb. Which Linux tools are you referring to? 
I'll go take a look at them.

In our environment gdb/gdbserver should always run realtime at a set 
priority. Help me understand why is it not a good idea to have 
gdb/gdbserver set its own priority based on an option in .gdbinit?

Thanks much!
Dave

Daniel Jacobowitz wrote:

>On Fri, Mar 18, 2005 at 10:29:32AM -0600, David Steven Trollope wrote:
>  
>
>>Hello!
>>
>>I'm working on a project that uses Linux 2.4 on a PowerPC processor with 
>>real time scheduling.
>>
>>One of the issues we've encountered is that when the application being 
>>debugged is running real time and gdb/gdbserver is not, scheduling 
>>problems occur.
>>
>>I'm wondering if its possible to have an option added to gdb and the 
>>.gdbinit file which specifies the realtime priority which gdb/gdbserver 
>>should run at.
>>
>>I searched the mailing list and do not find anything related to this in 
>>the past.
>>
>>Has anyone got experience in this area? Do patches already exist?
>>    
>>
>
>This is not a good idea.  There are existing Linux tools to change the
>realtime priority of a process; why can't you use them to change the
>priority of the debugger?  You can even do this after starting the
>inferior process if it isn't smart enough to reset its own priority.
>
>  
>

-- 
                 Dave Trollope
            Tel/Fax: +1 630 713 9110
           mailto:trollope@lucent.com
     http://nwswww.ih.lucent.com/~dtrollop/
  http://www.geocities.com/SiliconValley/7499/