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

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

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 
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?
>
> Comments?
>
> Regards,
> Nuno Silva
-- 
cat <<EOSIGN
Paolo Giarrusso, aka Blaisorblade
Linux Kernel 2.4.21/2.6.0-test on an i686; Linux registered user n. 292729
EOSIGN



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