Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1637498

Re: [PATCH] drm/i915: Make vblank evade warnings optional

Show all headers | View raw

On 05/08/2017 01:25 AM, Daniel Vetter wrote:
> On Sun, May 07, 2017 at 07:52:14PM -0600, Jens Axboe wrote:
>> On 05/07/2017 11:56 AM, Daniel Vetter wrote:
>>> On Sun, May 7, 2017 at 7:46 PM, Jens Axboe <axboe@kernel.dk> wrote:
>>>> On 05/07/2017 11:12 AM, ville.syrjala@linux.intel.com wrote:
>>>>> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>>>>>
>>>>> Add a new Kconfig option to enable/disable the extra warnings
>>>>> from the vblank evade code. For now we'll keep the warning
>>>>> about an actually missed vblank always enabled as that can have
>>>>> an actual user visible impact. But if we miss the deadline
>>>>> othrwise there's no real need to bother the user with that.
>>>>> We'll want these warnings enabled during development however
>>>>> so that we can catch regressions.
>>>>>
>>>>> Based on the reports it looks like this is still very easy
>>>>> to hit on SKL, so we have more work ahead of us to optimize
>>>>> the crtiical section further.
>>>>
>>>> Shouldn't it just be a debug printk or something instead, so that normal
>>>> people don't see it, but the folks that turn on debugging can get the
>>>> info they need? Seems silly to add a kconfig option for this.
>>>
>>> I guess we could keep it as debug for users, but we want to make this
>>> a hard failure on our CI machines. Kconfig knob is the easiest to roll
>>> out to all machines.
>>
>> Wouldn't a module parameter be more useful then, as an opt-in
>> to catch these violations.
>>
>> Nobody is going to know wtf to set this kconfig option to.
> 
> They're all hidden behind an overall i915 debugging option which tells you
> not to enable it. You won't see this.

OK, that does improve things a bit.

-- 
Jens Axboe

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [git pull] drm pull for v4.12 Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-06 22:10 +0200
  Re: [PATCH] drm/i915: Make vblank evade warnings optional Jens Axboe <axboe@kernel.dk> - 2017-05-08 00:00 +0200
    Re: [PATCH] drm/i915: Make vblank evade warnings optional Daniel Vetter <daniel@ffwll.ch> - 2017-05-08 01:10 +0200
      Re: [PATCH] drm/i915: Make vblank evade warnings optional Jens Axboe <axboe@kernel.dk> - 2017-05-08 04:00 +0200
        Re: [PATCH] drm/i915: Make vblank evade warnings optional Daniel Vetter <daniel@ffwll.ch> - 2017-05-08 09:30 +0200
          Re: [PATCH] drm/i915: Make vblank evade warnings optional Jens Axboe <axboe@kernel.dk> - 2017-05-08 17:20 +0200
  [PATCH] drm/i915: Make vblank evade warnings optional ville.syrjala@linux.intel.com - 2017-05-08 00:30 +0200
    Re: [PATCH] drm/i915: Make vblank evade warnings optional Daniel Vetter <daniel@ffwll.ch> - 2017-05-08 09:30 +0200
  Re: [git pull] drm pull for v4.12 Daniel Vetter <daniel@ffwll.ch> - 2017-05-08 01:00 +0200

csiph-web