From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: Xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] I-pipe on ARM platform.
Date: Sun, 07 Apr 2013 17:13:50 +0200 [thread overview]
Message-ID: <51618D2E.6080702@xenomai.org> (raw)
In-Reply-To: <51618C48.7040505@xenomai.org>
On 04/07/2013 05:10 PM, Gilles Chanteperdrix wrote:
> On 04/06/2013 08:32 PM, Jan Kiszka wrote:
>
>> On 2013-04-06 20:27, Gilles Chanteperdrix wrote:
>>>> And it has to map directly to might_fault
>>>> in case CONFIG_IPIPE_DEBUG_CONTEXT is disabled (thus zero overhead).
>>>
>>> That would defeat the purpose of the patch. might_fault can not be
>>> called over non root domains.
>>
>> True. But we should avoid leaving the costly irq-disable/enable and
>> domain checks in production code behind when might_fault actually
>> resolves to a nop. That should be the case for
>> !CONFIG_DEBUG_ATOMIC_SLEEP && !CONFIG_PROVE_LOCKING.
>
>
> I am almost sure I did not have either of these two options enabled when
> I observed the bug.
>
migh_fault also resolves to _cond_resched() when
CONFIG_PREEMPT_VOLUNTARY is enabled.
--
Gilles.
next prev parent reply other threads:[~2013-04-07 15:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 20:58 [Xenomai] I-pipe on ARM platform Gilles Chanteperdrix
2013-04-06 9:48 ` Jan Kiszka
2013-04-06 13:24 ` Philippe Gerum
2013-04-06 18:27 ` Gilles Chanteperdrix
2013-04-06 18:32 ` Jan Kiszka
2013-04-07 15:10 ` Gilles Chanteperdrix
2013-04-07 15:13 ` Gilles Chanteperdrix [this message]
2013-04-07 15:14 ` Jan Kiszka
2013-04-07 15:26 ` Gilles Chanteperdrix
2013-04-07 16:55 ` Gilles Chanteperdrix
2013-04-07 18:47 ` Gilles Chanteperdrix
2013-04-07 19:01 ` Jan Kiszka
2013-04-07 19:16 ` Gilles Chanteperdrix
2013-04-08 21:02 ` Gilles Chanteperdrix
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