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drm/i915: Sleep whilst waiting for the ring

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If userspace is submitting so many long running batches that the ring
becomes full, throttle by sleeping for a 1ms before checking for free
space. Simply yielding was causing excessive scheduler overhead whilst
making no progress.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-10-13 10:09:14 +01:00
parent 7b5337ddba
commit e60a0b107b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -707,7 +707,7 @@ int intel_wait_ring_buffer(struct drm_device *dev,
master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
} }
yield(); msleep(1);
} while (!time_after(jiffies, end)); } while (!time_after(jiffies, end));
trace_i915_ring_wait_end (dev); trace_i915_ring_wait_end (dev);
return -EBUSY; return -EBUSY;