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

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Message-ID: <f8571bb8-2a9a-e7d0-956a-f5fa39d2a14f@daenzer.net>
Date:   Thu, 6 Dec 2018 10:54:32 +0100
From:   Michel Dänzer <michel@...nzer.net>
To:     christian.koenig@....com,
        "Zhang, Jerry(Junwei)" <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

On 2018-12-06 10:49 a.m., Christian König wrote:
> Am 06.12.18 um 10:39 schrieb Zhang, Jerry(Junwei):
>> 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@....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 from cs submit, perhaps it may come from other places by
>> ttm_bo_evict_mm().
>> Is that right? Christian.
> 
> Yeah, exactly my thinking as well. When we silence the TTM messages we
> might miss those cases.
> 
> Additional to that other drivers using TTM might not have those messages
> either.
> 
> If TTM is to noisy we should use ratelimit and/or reduce the number and
> size of the warning messages.
> 
> A simple "Warning, I ran out of memory during eviction!" should do.

Just dropping the last hunk of this patch should do then. I can do that.


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