Commit e60a0b10 authored Oct 13, 2010 by Chris Wilson

drm/i915: Sleep whilst waiting for the ring



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>

parent 7b5337dd

drivers/gpu/drm/i915/intel_ringbuffer.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -707,7 +707,7 @@ int intel_wait_ring_buffer(struct drm_device *dev,
		master_priv->sarea_priv->perf_boxes \|= I915_BOX_WAIT;
		}

		yield();
		msleep(1);
		} while (!time_after(jiffies, end));
		trace_i915_ring_wait_end (dev);
		return -EBUSY;