[Mono-dev] PPC_64K_PAGES (Re: Running Mono on 32bits-big endian PowerPC)

[Alex Rønne Petersen]

Yep, it's certainly not ideal; run-time detection would be, and I
think it should be possible to change SGen to do that. But I wouldn't
mind applying that change to Mono if it helps Debian's builds. It
seems like a reasonable enough workaround in the meantime.

On Mon, Apr 11, 2016 at 10:46 AM, Mathieu Malaterre <malat at debian.org> wrote:
> Actually... that should work. Maybe this will put some more stress on
> some small systems (small memory size).
>
> On Mon, Apr 11, 2016 at 10:32 AM, Alex Rønne Petersen <alex at alexrp.com> wrote:
>> Hi Mathieu,
>>
>> So it would be appropriate to change the #if to
>>
>>     #if defined (TARGET_POWERPC) || defined (TARGET_POWERPC64)
>>
>> if I understand the problem correctly?
>>
>> Regards,
>> Alex
>>
>> On Mon, Apr 11, 2016 at 10:18 AM, Mathieu Malaterre <malat at debian.org> wrote:
>>> # set patch tag at least to get some attention, may need some tweaking
>>> # since pagesize on buildd machine != user installed one
>>> Control: tags -1 patch
>>>
>>> On Thu, Mar 31, 2016 at 2:37 PM, Mathieu Malaterre <malat at debian.org> wrote:
>>>> Dear all,
>>>>
>>>> I am currently trying to resurrect Mono debian package on PowerPC (32bits BE).
>>>>
>>>> I have two questions:
>>>>
>>>> - Is there a released version I should consider to start with if I
>>>> want to make mono work son PowerPC again ?
>>>>
>>>> - I see some big changes here at:
>>>> 99902cec93dfbc9e18e3fb6fa07b8770a3bd9adc so I am wondering if version
>>>> 4.2.1.102 (current debian package) is not a bit too old so get things
>>>> back in shape.
>>>
>>> Answering my own post.
>>>
>>> So the bug was really within sgen implementation details:
>>> ARCH_MIN_MS_BLOCK* definitions.
>>>
>>> Within debian infrstratucture, our buildd machines are setup using
>>> default debian kernel, and the default kernel logical page size was
>>> changed recently:
>>>
>>> [debian/config/kernelarch-powerpc/config-arch-64: Set PPC_64K_PAGES.]
>>> https://anonscm.debian.org/cgit/kernel/linux.git/commit/?id=aed63a56b189d771116f2d4b8fe10bbec528e6a2
>>>
>>> The ppc32 buildd machine is setup on a ppc64 kernel. For some obscure
>>> details (at least to me), one cannot run a debian ppc32 kernel on
>>> ppc64 arch. Which means that the basic `mono` compiler is compiled
>>> using ppc32 user space, but at C# compile time is executed on ppc64
>>> kernel.
>>>
>>> I am guessing another simple patch would be to run the bootstrap
>>> process with gc=none and keep the default sgen 4K setting for ppc32
>>> machine.
>>>
>>> It would be nice that mono detect any incoherence at runtime, this
>>> would make tracking this bug in the future *so* much easier.
>>>
>>> -M
>>>
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