[Intel-gfx] [PATCH] [RFC] drm/i915: Generate a hang error code

[Daniel Vetter]

On Tue, Feb 4, 2014 at 1:18 PM, Ben Widawsky
<benjamin.widawsky at intel.com> wrote:
> We get a large number of bugs which have a, "hey I have that too"
> because they see a GPU hang in dmesg. While two machines of the same
> model having a GPU hang is indeed a coincidence, it is far from enough
> evidence to suggest they are the same.
>
> In order to reduce this effect, and hopefully get people to file new bug
> reports, clearly the error message itself has been insufficient (see ref
> at the bottom for a new bug report with this characteristic).
>
> The algorithm is purposely pretty naive. I don't think we need much in
> order to avoid the problem I am trying to solve, and keeping it naive
> gives us some ability to make a decent test case.
>
> Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=73276

I think most of this can be avoided by actually renaming bugs to have
sane summaries - of course people will go "me, too" if the summary is
"ubuntu gpu hangs". For everything else I think if users aren't
capable of the rather verbose "pls file new bug report, don't me-too"
we dump into dmesg nothing else will help. And for developers it's imo
better to smash such things into our error state decoder, similar to
some of the other analysis steps we already do (like decoding the HEAD
pointer).

So not convinced really.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch