[okl4-developer] What's Wombat priority?

[Jorge Torres]

Antonin,

Also, If you want to check out by code following what happens, the linux
entry point is at: linux/kernel/arch/l4/kernel/main.c,

There you'll understand it clear,

Cheers,

Jorge


On Tue, Apr 1, 2008 at 11:10 AM, Jorge Torres <
jorge.torres.maldonado at gmail.com> wrote:

> Hi Antonin,
>
> You'll get a nicer look of priorities at any stage if you use the KDB, you
> can enter there at any time under wombat execution with Ctrl+k, you'll get
> KDB terminal output, then choose 'q' option, and you'll see whats going on,
> the two usermode Linux kernel  threads are, L_timer and L_syscall. you can
> also tag your threads for the KDB env if you:
> L4_KDB_SetThreadName(L4_Myself(), "yourname");
>
> All the best,
>
> Jorge
>
>
> On Tue, Apr 1, 2008 at 10:48 AM, Abi Nourai <anourai at ok-labs.com> wrote:
>
> > Hi Antonin,
> >
> > I've noticed you're digging deeper into the belly of the beast that is
> > OKL4 every day.  Keep it up !
> >
> > I'll answer the easy questions for you immediately, and leave the more
> > tricky ones for tomorrow.
> >
> > 255 is highest priority.  0 is the lowest priority.
> >
> > Wombat actually consists of two threads, a thread that receives device
> > interrupts (including timer ticks), and another thread that
> > effectively does 99% of the work (sometimes called the worker thread
> > or the syscall thread).
> >
> > FYI one reason for the existence of threads is so that the syscall
> > thread (think of it as *the* linux kernel thread) can simulate
> > disabling interrupts by telling the interrupt thread 'hey, when you
> > get an interrupt, I don't want to know about it - so keep track of it
> > internally, and deliver it to me by exreg only when I 'enable'
> > interrupts' .
> >
> > In this model, the interrupt thread effectively servers fulfills the
> > function of the hardware in a non-virtualized environment.  It takes
> > the interrupt trap, and delivers it to the OS (syscall thread) when
> > interrupts are enabled.  Hence the interrupt thread runs at a higher
> > priority (100) than the syscall thread (99).
> >
> > Regards
> > Abi
> >
> > On 02/04/2008, at 1:34 AM, Antonin SUBTIL wrote:
> > > Hello,
> > >
> > >
> > > I had a look to Sconscript in Iguana, and here is my question :
> > > "weaver = env.WeaverIguanaProgramServer(server_name =
> > > "OKL4_HELLO_SERVER", priority=50)"
> > > Are priorities on 0-255 ? Is 255 big or low priority?
> > > What's Wombat priority? (If I'm trying to put some real-time server,
> > > I should know it... yet I was able too find it)
> > >
> > > Do anyone have a doc of this function? There's other arguments for
> > > Linux I would like to understand...
> > >
> > >
> > > Thanks
> > >
> > >
> > > --
> > > Antonin Subtil,
> > > 35 rue Donissan
> > > FR-33000 Bordeaux
> > > +33 (0)6.77.40.17.69
> > > _______________________________________________
> > > Developer mailing list
> > > Developer at okl4.org
> > > https://lists.okl4.org/mailman/listinfo/developer
> >
> >
> > _______________________________________________
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> >
>
>
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