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SubjectRe: [PATCH 1/2] mm: export find_extend_vma and handle_mm_fault for driver use


On 11/05/2014 11:51 PM, Jesse Barnes wrote:
> On Wed, 5 Nov 2014 13:03:51 +0100
> Joerg Roedel <jroedel@suse.de> wrote:
>
>> Hi Oded, Jesse,
>>
>> On Wed, Oct 29, 2014 at 11:33:38AM +0200, Oded Gabbay wrote:
>>> I tested our amdkfd driver with your patches applied (kernel 3.17.1).
>>> I run OpenCL tests, Aparapi/Sumatra (Java) and OpenMP
>>>
>>> All tests passed and I didn't see any kernel error messages.
>>>
>>> So:
>>>
>>> Tested-by: Oded Gabbay <oded.gabbay@amd.com>
>>
>> Thanks for testing Oded. Jesse, the patch looks good to me, except the
>> task accounting for the page-faults. I'd like to get rid of using
>> task_struct in the IOMMUv2 driver entirely if possible. Also it is not
>> really the CPU task causing the faults, but some non-CPU process.
>
> Hm, but the CPU task initiates the activity on the GPU, so we should
> account for it somewhere, right? I guess I had been thinking of the
> "task" as spanning the CPUs and GPUs and other devices in the system,
> rather than just representing the CPU activity.

Joerg, sorry for the dumb question but what do you mean by "task accounting for
page-faults"? Where is that code in IOMMUv2 driver now ?

>
>> So can you please remove that code and resend the patches with Oded's
>> Tested-by and Andrew Morton on Cc? I think these patches should go
>> through the -mm tree.
>
> Sure, thanks.
>


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