[PATCH] drm/amd/amdgpu: Add tracepoint for DMA page mapping

[Christian König]

Am 01.08.2017 um 19:00 schrieb Tom St Denis:
> On 01/08/17 11:41 AM, Christian König wrote:
>> We can turn of the trace subsystem during compile time already.
>>
>> Additional to that the trace points use self modifying code to make 
>> sure that they don't have any overhead as long as they are turned 
>> off. But I don't think this works with the "if (trace_*_enabled()" as 
>> well.
>>
>> Anyway, not a performance critical code path so I don't really bother.
>
> Well aside from that this will only really be useful in upstream 
> kernels where we don't control the configuration.
>
> Eventually if we come up with a better solution (tm) then we can 
> revert this cleanly.

Actually even if we come up with some other approach to access the GPU 
VM of a process I would rather like to keep that trace point because it 
is rather useful for some userptr debugging as well.

Christian.

>
> Tom
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