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SubjectRe: [PATCH 2/2] drm/ttm: Use pr_debug for all output from ttm_bo_evict
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On 2018-12-06 5:46 p.m., Joe Perches wrote:
> On Thu, 2018-12-06 at 17:39 +0800, Zhang, Jerry(Junwei) wrote:
>> On 12/6/18 5:33 PM, Koenig, Christian wrote:
>>> Am 06.12.18 um 10:09 schrieb Michel Dänzer:
>>>> On 2018-12-06 3:43 a.m., Zhang, Jerry(Junwei) wrote:
>>>>> On 12/6/18 12:56 AM, Michel Dänzer wrote:
>>>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>>>
>>>>>> All the output is related, so it should all be printed the same way.
>>>>>> Some of it was using pr_debug, but some of it appeared in dmesg by
>>>>>> default. The caller should handle failure, so there's no need to spam
>>>>>> dmesg with potentially quite a lot of output by default.
>>>>>>
>>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>>> Sounds reasonable, but personally prefer to show error when some
>>>>> vital incident happens, e.g. no memory on eviction.
>>>> The amdgpu driver still prints these in that case:
>>>>
>>>> [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* amdgpu_cs_list_validate(validated) failed.
>>>> [drm:amdgpu_cs_ioctl [amdgpu]] *ERROR* Not enough memory for command submission!
>
> Aren't dump_stack()s already done on all these allocation failures?
> I don't notice any use of __GFP_NOWARN on generic allocations in drm.

Most of the time, these messages are due to being unable to allocate a
TTM BO or move it where it needs to go, not due to the kernel failing to
allocate memory in general.


--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer

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