From: Chris Wilson Date: Wed, 13 Oct 2010 09:09:14 +0000 (+0100) Subject: drm/i915: Sleep whilst waiting for the ring X-Git-Tag: firefly_0821_release~7613^2~3600^2~14^2~32 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e60a0b107b3df072e23cb6d68510aa2615b059ce;p=firefly-linux-kernel-4.4.55.git 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 --- diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index d89b88791aac..89004a622f49 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -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;