[Xenomai-core] XENO_OPT_DEBUG impact (was: exception 768)

[Jan Kiszka <jan.kiszka@domain.hid>]

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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?)
   => CONFIG_XENO_OPT_DEBUG_POSIX

 - CONFIG_XENO_SPINLOCK_DEBUG => 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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