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SubjectRe: [PATCH 1/2] mm: export find_extend_vma and handle_mm_fault for driver use
On Wed, 5 Nov 2014 13:03:51 +0100
Joerg Roedel <> 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 <>
> 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.

> 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.

Jesse Barnes, Intel Open Source Technology Center

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