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Date: Fri, 22 Dec 2006 10:38:27 +0100 (CET)
From: "M. Koehrer" <mathias_koehrer@domain.hid>
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Subject: [Xenomai-help] Re: Re: A fairly small rtnet/Xenomai...
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To: gilles.chanteperdrix@xenomai.org, mathias_koehrer@domain.hid
Cc: xenomai@xenomai.org

Hi Gilles and Dmitry,

I actually prefer Gilles proposal to add the fault_vm() function after call=
ing
a forking function.=20
Dmitry's idea with a different context and inter process communication will=
 surely
work but it makes the code less transparent as when using the fault_vm() fu=
nction.
Are there situations where the fault_vm() could fail or is this fine in all=
 situations?

Regards

Mathias
> M. Koehrer wrote:
> > Good morning everybody,
> >=20
> > here are some more news concerning the Xenomai crash issue.=20
> > 1) I have tried to enable the CONFIG_DEBUG_SPINLOCK and
> CONFIG_DEBUG_SPINLOCK_SLEEP
> > kernel config parameters. But I did not get any messages before the ker=
nel
> freezes.
> >=20
> > 2) I have tried to link a static application (using -lstatic). When I
> pass
> > the -L/usr/lib/nptl  option to force the linker to use the nptl libs, t=
he
> effect is the same.
> > Well, I have now a static binary that freezes the system.
> > I can mails you the binary file (about 280kByte bz2 file) if you like.
> > I think this file is too large to be posted to the list.
> >=20
> > One additional question comes in my mind:
> > As I learned from all that things that are related to the issue, it see=
ms
> to be fairly
> > critical to fork out of a real time task or to create new processes out=
 of
> it.
>=20
> In absence of a better solution, I would recommend to use the "fault_vm"
>  function after each fork.
>=20


--=20
Mathias Koehrer
mathias_koehrer@domain.hid


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