[Intel-gfx] [PATCH 00/15] [RFC] Forced throttling/scheduling

[Eugeni Dodonov]

On Sat, Nov 19, 2011 at 00:24, Ben Widawsky <ben at bwidawsk.net> wrote:

> This code is currently living on my personal git repo:
> git://people.freedesktop.org/~bwidawsk/drm-intel<http://people.freedesktop.org/%7Ebwidawsk/drm-intel>forced_throttling
>
> Since these are RFC, I haven't spent too much time cleaning things up.
> Feel free to comment on typos, comments you feel are missing, etc. I
> also haven't spent any time running the standard kernel tests, kmemleak
> and such - I intend to do so while these are reviewed here.
>
> There are two main "scheduler" types implemented in this patch. What I
> refer to as a fairness scheduler, and a batch scheduler. The fairness
> scheduler is currently implemented on batch granularity but that is not
> guaranteed going forward. The batch scheduler is a way to set batch
> limits per pid. Refer to the relevant patch for more details.
>
> It is my opinion that the fairness scheduler isn't terribly interesting
> except to prevent badly written, or malicious apps. For example, a 3d
> app which queues up a ton of work but never calls glxSwapBuffer.
>
> The batch scheduler is also somewhat uninteresting as the values it uses
> require proper tuning and will vary from system to system, and even then
> depending on what's currently running. But like the fairness one, this
> too has its applications.
>
> Most comments and feedback are welcome.
>

I am not that expert about how GPU scheduling works, but all the patches
make sense to me and I haven't found anything apparently wrong.

I have one feature request for patch 11, which is to list available
schedulers via a debugfs entry. For example:
# cat /sys/kernel/debug/dri/0/i915_available_schedulers
none *fair batch

or list them in the output of i915_scheduler, like:
# cat /sys/kernel/debug/dri/0/i915_scheduler
...
Scheduler: batch
Available schedulers: none fair batch

To see what schedulers are available for usage.

But besides this, for the series:
Tested-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20111129/a018931b/attachment.html>