Jan Kiszka wrote:
> 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?
Probably not, the vmalloced area is added only to the page table of the
process that calls vmalloc, it is added to other processes table page
only once they use it.
--
Gilles Chanteperdrix
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