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

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Message-ID: <3c44fef6-751a-b322-3b84-eef192012606@kernel.dk>
Date:   Sun, 7 May 2017 11:46:07 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     ville.syrjala@...ux.intel.com, intel-gfx@...ts.freedesktop.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Dave Airlie <airlied@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: Re: [PATCH] drm/i915: Make vblank evade warnings optional

On 05/07/2017 11:12 AM, ville.syrjala@...ux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@...ux.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.

-- 
Jens Axboe