linux-kernel - Re: [PATCH 2/2] drm/ttm: Use pr_debug for all output from ttm_bo

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Date:   Thu, 6 Dec 2018 09:33:40 +0000
From:   "Koenig, Christian" <Christian.Koenig@....com>
To:     Michel Dänzer <michel@...nzer.net>,
        "Zhang, Jerry" <Jerry.Zhang@....com>,
        "Huang, Ray" <Ray.Huang@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 2/2] drm/ttm: Use pr_debug for all output from
 ttm_bo_evict

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@....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@....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!
>
> That's plenty as far as I'm concerned. :)

Yeah, but in this case I would rather make the amdgpu messages debug 
level and leave the TTM meassages on error level.

Christian.