CIK hangs with kernel 3.15, bisected

[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