Re: [Adeos-main] [PATCH] I-pipe tracer for ARM

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

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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.)?
> 
> 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.
> 

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


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