CIK hangs with kernel 3.15, bisected

[Christian König]

Couldn't reproduce the issue so far. So the attached patch is just a 
complete shoot into the dark found by rereading the code, but it might 
actually be the problem.

Please give it a try.

Going to keep testing in the meantime,
Christian.

Am 10.05.2014 10:23, schrieb Christian König:
>> I see hangs with kernel 3.15 and SI under memory pressure, e.g. if I 
>> boot with radeon.vramlimit=256 and then run Xonotic timedemo with 
>> high settings. I haven't had a chance to bisect it yet, but it might 
>> be a similar problem.
> Sounds like the same issue to me. Thx for the good test case.
>
>> Any idea what is wrong with it?
> Actually I already wondered that it went so smooth without any 
> regression so far, didn't noticed the bug in bugzilla.kernel.org yet.
>
>> Some of the tests allocate a lot of MSAA textures and the tests also
>> run in parallel, which creates a lot of memory pressure and probably
>> causes buffer evictions.
> Sounds like the underlying problem to me. We probably evict some part 
> of a page table without updating the page directory. Going to dig into 
> it today, it's probably just a one liner missing somewhere in the VM 
> code.
>
> Christian.
>
> Am 09.05.2014 23:39, schrieb Grigori Goronzy:
>> On 09.05.2014 20:03, Marek Olšák wrote:
>>>
>>> This commit which first appeared in 3.15-rc1 causes hangs on Bonaire:
>>> [...]
>>>
>>> The simplest way to reproduce the hangs is to run piglit with these 
>>> parameters:
>>> -t texelFetch.fs
>>>
>>> Some of the tests allocate a lot of MSAA textures and the tests also
>>> run in parallel, which creates a lot of memory pressure and probably
>>> causes buffer evictions.
>>>
>>
>> I see hangs with kernel 3.15 and SI under memory pressure, e.g. if I 
>> boot with radeon.vramlimit=256 and then run Xonotic timedemo with 
>> high settings. I haven't had a chance to bisect it yet, but it might 
>> be a similar problem.
>>
>> Grigori
>

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