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Date: Tue, 05 Dec 2006 15:40:29 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Adeos-main] [PATCH] I-pipe tracer for ARM
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: adeos-main@gna.org

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>> Sebastian Smolorz wrote:
>>
>>> Jan Kiszka wrote:
>>>> Are you tracing into vmalloc'ed memory?
>>> Yes, without CONFIG_IPIPE_TRACE_VMALLOC the system does not boot.
>>
>> Hmm, makes me wonder of some laziness of the page mapping or a missing=

>> lock-against-swapping causes this. Could you have a closer look at the=

>> tracer code if we are lacking some magic for the vmalloc trace buffer
>> (compare to the xnheap code, e.g.)?
>=20
> This is a known issue, the ARM architecture lacks the set_pgdir
> function, needed in mm/vmalloc.c to workaround the lazy page mapping of=

> vmalloced areas.
>=20

Would vmalloc+memset help to be safe for the remaining system runtime?


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