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Date: Fri, 17 Nov 2006 19:41:31 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: [Xenomai-core] XENO_OPT_DEBUG impact (was: exception 768)
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To: rpm@xenomai.org, Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>

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Philippe Gerum wrote:
> ...
> Disable CONFIG_XENO_OPT_DEBUG from your kernel configuration, this is
> the source of the PTE misses you are seeing now on ppc. This is not to
> say that those errors are normal, and this issue still remains to be
> fixed, but unless you want to debug the Xenomai nucleus, you don't need=

> this option on (additionally, it adds a large overhead which translates=

> in significantly augmented jitter).

CONFIG_XENO_OPT_DEBUG should not add large jitters - that's what e.g.
CONFIG_XENO_OPT_DEBUG_QUEUES is now for.

I'm currently seeing two potential "misuses" of the common switch:

 - the posix skin (Gilles, how heavy-weighted are those checks?)
   =3D> CONFIG_XENO_OPT_DEBUG_POSIX

 - CONFIG_XENO_SPINLOCK_DEBUG =3D> CONFIG_XENO_OPT_DEBUG_SPINLOCK

Both should be explicitly controllable in Kconfig.

Gilles, is CONFIG_XENO_OPT_DEBUG_BHEAP used in any way? Doesn't seem so.

Jan


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