Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH 2/2] drm/ttm: Use pr_debug for all output from
 ttm_bo_evict
From:   =?UTF-8?Q?Michel_D=c3=a4nzer?= <michel@daenzer.net>
To:     "Koenig, Christian" <Christian.Koenig@amd.com>,
        "Zhang, Jerry" <Jerry.Zhang@amd.com>,
        "Huang, Ray" <Ray.Huang@amd.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
References: <20181205165621.5805-1-michel@daenzer.net>
 <20181205165621.5805-2-michel@daenzer.net>
 <b0b57acb-7152-ab1a-855a-3de8c77fa425@amd.com>
 <3198051c-c09d-5bf9-e177-3a90b10b4149@daenzer.net>
 <d0990059-24bb-3f21-8b9d-85761f0be409@amd.com>
 <29939fbd-939e-ca66-b355-d85b51c5a3ae@daenzer.net>
Openpgp: preference=signencrypt
Autocrypt: addr=michel@daenzer.net; prefer-encrypt=mutual; keydata=
 mQGiBDsehS8RBACbsIQEX31aYSIuEKxEnEX82ezMR8z3LG8ktv1KjyNErUX9Pt7AUC7W3W0b
 LUhu8Le8S2va6hi7GfSAifl0ih3k6Bv1Itzgnd+7ZmSrvCN8yGJaHNQfAevAuEboIb+MaVHo
 9EMJj4ikOcRZCmQWw7evu/D9uQdtkCnRY9iJiAGxbwCguBHtpoGMxDOINCr5UU6qt+m4O+UD
 /355ohBBzzyh49lTj0kTFKr0Ozd20G2FbcqHgfFL1dc1MPyigej2gLga2osu2QY0ObvAGkOu
 WBi3LTY8Zs8uqFGDC4ZAwMPoFy3yzu3ne6T7d/68rJil0QcdQjzzHi6ekqHuhst4a+/+D23h
 Za8MJBEcdOhRhsaDVGAJSFEQB1qLBACOs0xN+XblejO35gsDSVVk8s+FUUw3TSWJBfZa3Imp
 V2U2tBO4qck+wqbHNfdnU/crrsHahjzBjvk8Up7VoY8oT+z03sal2vXEonS279xN2B92Tttr
 AgwosujguFO/7tvzymWC76rDEwue8TsADE11ErjwaBTs8ZXfnN/uAANgPLQjTWljaGVsIERh
 ZW56ZXIgPG1pY2hlbEBkYWVuemVyLm5ldD6IXgQTEQIAHgUCQFXxJgIbAwYLCQgHAwIDFQID
 AxYCAQIeAQIXgAAKCRBaga+OatuyAIrPAJ9ykonXI3oQcX83N2qzCEStLNW47gCeLWm/QiPY
 jqtGUnnSbyuTQfIySkK5AQ0EOx6FRRAEAJZkcvklPwJCgNiw37p0GShKmFGGqf/a3xZZEpjI
 qNxzshFRFneZze4f5LhzbX1/vIm5+ZXsEWympJfZzyCmYPw86QcFxyZflkAxHx9LeD+89Elx
 bw6wT0CcLvSv8ROfU1m8YhGbV6g2zWyLD0/naQGVb8e4FhVKGNY2EEbHgFBrAAMGA/0VktFO
 CxFBdzLQ17RCTwCJ3xpyP4qsLJH0yCoA26rH2zE2RzByhrTFTYZzbFEid3ddGiHOBEL+bO+2
 GNtfiYKmbTkj1tMZJ8L6huKONaVrASFzLvZa2dlc2zja9ZSksKmge5BOTKWgbyepEc5qxSju
 YsYrX5xfLgTZC5abhhztpYhGBBgRAgAGBQI7HoVFAAoJEFqBr45q27IAlscAn2Ufk2d6/3p4
 Cuyz/NX7KpL2dQ8WAJ9UD5JEakhfofed8PSqOM7jOO3LCA==
Message-ID: <d1262420-7e36-07dc-ffa2-cc4492fa4097@daenzer.net>
Date:   Thu, 6 Dec 2018 10:50:29 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.3.1
MIME-Version: 1.0
In-Reply-To: <29939fbd-939e-ca66-b355-d85b51c5a3ae@daenzer.net>
Content-Type: text/plain; charset=utf-8
Content-Language: en-CA
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 2018-12-06 10:38 a.m., Michel Dänzer wrote:
> On 2018-12-06 10:33 a.m., 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!
>>>
>>> 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.
> 
> That makes no sense to me.
> 
> The amdgpu messages have some value for normal users / bug reports,
> indicating that something isn't going quite as planned.
> 
> The TTM messages are orders of magnitude longer, and are basically noise
> for a normal user.
> 
> Seems like a no-brainer to me which of these should be visible by default.

Moreover, not every case producing the driver output also produces the
TTM output, so it could make it difficult to realize that there's a
memory pressure situation.


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