Re: [Nouveau] [PATCH] drm/nouveau: wait for the exclusive fence after the shared ones v2

[Thorsten Leemhuis <regressions@leemhuis.info>]

Hi, this is your Linux kernel regression tracker speaking.

On 09.12.21 11:23, Christian König wrote:
> Always waiting for the exclusive fence resulted on some performance
> regressions. So try to wait for the shared fences first, then the
> exclusive fence should always be signaled already.
> 
> v2: fix incorrectly placed "(", add some comment why we do this.
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>

FWIW: In case you need to send an improved patch, could you please add
this (see (¹) below for the reasoning):

Link:
https://lore.kernel.org/dri-devel/da142fb9-07d7-24fe-4533-0247b8d16cdd@sfritsch.de/

And if the patch is already good to go: could the subsystem maintainer
please add it when applying? See (¹) for the reasoning.

BTW, these two lines afaics are missing as well:

Fixes: 3e1ad79bf661 ("drm/nouveau: always wait for the exclusive fence")
Reported-by: Stefan Fritsch <sf@sfritsch.de>

Ciao, Thorsten

(¹) Long story: The commit message would benefit from a link to the
regression report, for reasons explained in
Documentation/process/submitting-patches.rst. To quote:

```
If related discussions or any other background information behind the
change can be found on the web, add 'Link:' tags pointing to it. In case
your patch fixes a bug, for example, add a tag with a URL referencing
the report in the mailing list archives or a bug tracker;
```

This concept is old, but the text was reworked recently to make this use
case for the Link: tag clearer. For details see:
https://git.kernel.org/linus/1f57bd42b77c

Yes, that "Link:" is not really crucial; but it's good to have if
someone needs to look into the backstory of this change sometime in the
future. But I care for a different reason. I'm tracking this regression
(and others) with regzbot, my Linux kernel regression tracking bot. This
bot will notice if a patch with a Link: tag to a tracked regression gets
posted and record that, which allowed anyone looking into the regression
to quickly gasp the current status from regzbot's webui
(https://linux-regtracking.leemhuis.info/regzbot ) or its reports. The
bot will also notice if a commit with a Link: tag to a regression report
is applied by Linus and then automatically mark the regression as
resolved then.

IOW: this tag makes my life a regression tracker a lot easier, as I
otherwise have to tell regzbot manually when the fix lands. :-/

#regzbot ^backmonitor:
https://lore.kernel.org/dri-devel/da142fb9-07d7-24fe-4533-0247b8d16cdd@sfritsch.de/