From: Wolfgang Grandegger <wg@domain.hid>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Mode switch when using RT heap on ARM
Date: Mon, 10 Nov 2008 13:32:57 +0100 [thread overview]
Message-ID: <491829F9.2050305@domain.hid> (raw)
In-Reply-To: <52e18582a48da6c08ed88bbce325aed8.squirrel@domain.hid>
Gilles Chanteperdrix wrote:
> Wolfgang Grandegger wrote:
>> Hello,
>>
>> I realized that accessing memory allocated with rt_heap_alloc() causes
>> mode switches on ARM i.mx31. The attached patch provides a demo program
>> to demonstrate the problem, which actually does *not* show up on my
>> PowerPC TQM5200 board.
>
> On ARM, we normally map the heaps uncacheable, this should not be
> necessary on ARMv6, but I am afraid we then get the fault on first access.
Is each cache-line of the heap not touched automatically when the heap
gets created? I thought it's necessary for other archs as well.
Wolfgang.
next prev parent reply other threads:[~2008-11-10 12:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-10 9:58 [Xenomai-help] Mode switch when using RT heap on ARM Wolfgang Grandegger
2008-11-10 11:42 ` Gilles Chanteperdrix
2008-11-10 12:32 ` Wolfgang Grandegger [this message]
2008-11-10 12:35 ` Wolfgang Grandegger
[not found] ` <c54f288fee2b8a5ee68a00c27056c6ed.squirrel@domain.hid>
2008-11-10 18:55 ` Wolfgang Grandegger
2008-11-10 19:02 ` Gilles Chanteperdrix
2008-11-10 20:05 ` Wolfgang Grandegger
2008-11-11 22:46 ` Gilles Chanteperdrix
2008-11-12 8:55 ` Wolfgang Grandegger
2008-11-12 9:12 ` Philippe Gerum
2008-11-12 10:24 ` Gilles Chanteperdrix
2008-11-12 10:50 ` Wolfgang Grandegger
2008-11-12 11:12 ` Philippe Gerum
2008-11-12 11:20 ` Wolfgang Grandegger
2008-11-13 17:57 ` Gilles Chanteperdrix
2008-11-13 18:27 ` Wolfgang Grandegger
2008-11-13 18:23 ` Gilles Chanteperdrix
2008-11-13 18:39 ` Wolfgang Grandegger
2008-11-13 18:15 ` Gilles Chanteperdrix
2008-11-13 20:15 ` Wolfgang Grandegger
2008-11-14 8:22 ` Gilles Chanteperdrix
2008-11-14 9:46 ` Wolfgang Grandegger
2008-11-14 9:45 ` Gilles Chanteperdrix
2008-11-17 13:41 ` Gilles Chanteperdrix
-- strict thread matches above, loose matches on Subject: below --
2008-11-11 11:24 Gilles Chanteperdrix
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