[Intel-gfx] [PATCH] drm/i915: Compute a loadavg as the number of pending requests

Eugeni Dodonov eugeni at dodonov.net
Sat Jan 7 23:47:49 CET 2012

On Sat, Jan 7, 2012 at 19:03, Chris Wilson <chris at chris-wilson.co.uk> wrote:

> The number of pending requests correlates to the number of batches
> queued and so with the amount of work being performed by the GPU. We
> borrow the concept of loadavg from the scheduler, using the count of
> batches as the count of runnables, and simply adjust the timescales for
> a 60x higher sample rate, i.e. the three values are the load average for
> approximately the last 1s, 5s and 15 respectively. The counter is
> started only once GPU activity is detected, and is then sampled at 60 Hz
> until 10s after the GPU goes idle before the counters are reset and
> sampling ceases.
> Sample output for running aa10text under gnome-shell:
>  Total: 55.29 57.54 61.14
>  render ring: 54.80 57.17 60.76
>  gen6 bsd ring: 0.00 0.00 0.00
>  blt ring: 0.48 0.37 0.37
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Eugeni Dodonov <eugeni.dodonov at intel.com>

Very nice one!

Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
Acked-by: Eugeni Dodonov <eugeni.dodonov at intel.com>

Eugeni Dodonov
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