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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2015-05-21 21:01:48 +0100 |
|---|---|---|
| committer |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-05-22 08:59:52 +0200 |
| commit | d0bc54f2f012d8c8c3b4315f51f408ff3d938031 (patch) | |
| tree | 10fb00416f3e71313a1e4092dc89729c2b5287a2 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | drm/i915: Use the correct destructor for freeing requests on error (diff) | |
| download | linux-dev-d0bc54f2f012d8c8c3b4315f51f408ff3d938031.tar.xz linux-dev-d0bc54f2f012d8c8c3b4315f51f408ff3d938031.zip | |
drm/i915: Introduce DRM_I915_THROTTLE_JIFFIES
As Daniel commented on
commit b7ffe1362c5f468b853223acc9268804aa92afc8
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon Apr 27 13:41:24 2015 +0100
drm/i915: Free RPS boosts for all laggards
it is better to be explicit when sharing hardcoded values such as
throttle/boost timeouts. Make it so!
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 44d592f3b67c..1038f5c7f15b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -279,6 +279,12 @@ struct drm_i915_file_private { struct { spinlock_t lock; struct list_head request_list; +/* 20ms is a fairly arbitrary limit (greater than the average frame time) + * chosen to prevent the CPU getting more than a frame ahead of the GPU + * (when using lax throttling for the frontbuffer). We also use it to + * offer free GPU waitboosts for severely congested workloads. + */ +#define DRM_I915_THROTTLE_JIFFIES msecs_to_jiffies(20) } mm; struct idr context_idr; |