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

[Mathieu Malaterre]

No. This should be -ideally- a runtime configuration. pagesize
setting(s) during compilation is not the pagesize setting(s) during
execution.

I am hoping someone with better understanding of sgen implementation
could comment on a better runtime patch.

-M

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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