Re: [uml-devel] Problem with Real-Time Scheduling

[Nuno Silva <nuno.silva@vgertech.com>]

Hello!

BlaisorBlade wrote:
> Alle 22:23, domenica 26 ottobre 2003, Nuno Silva ha scritto:
> 
>>Hi!
>>
>>Wouldn't it be nice if the threads updated their argv[0] to something like
>>"argv[0]-kernel"
>>"argv[0]-userspace"
>>"argv[0]-sigio"
>>"argv[0]-sigwinch"?
>>
>>I would send a patch but my first attempt didn't work... Can this be
>>done?
>>Maybe renicing the threads could help in environments where you
>>have lots of UMLs running? Like having the kernel runnig at -10 and
>>userspace at 19 and sigio at 19?
> 
> Avoid nice=19 since there have been some notable patches in 2.5(even present 
> in 2.4-ck tree) to make such task run only in place of the idle task. And 
> having the kernel running at -10 means having high permissions.
> Adding an option to make UML switch to some UID after startup is not 
> difficult. But first we need to know until which point it needs root 


I wasn't talking about running UML as root. Just an easy way to identify 
each thread.

After a script (maybe run by root, maybe not) can easily spot which 
thread does what we could renice the process, remove linux capabilities, 
killall -STOP linux-sigio, etc... ;)


> priviledges. And probably, capabilities are just enough. And at some point, 
> in 2.6 there will be setcapability extended attributes(it's not hard now that 
> extended attrs work).
> 
>>Maybe this could make the "time" inside
>>UML more consistent in high loads?
>>

This would be really good! :)

Regards,
Nuno Silva



>>Comments?
>>
>>Regards,
>>Nuno Silva



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