[okl4-developer] What's Wombat priority?

[Jorge Torres]

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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