[PATCH 07/62] drm/i915: Retire oldest completed request before allocating next

[Chris Wilson]

In order to keep the memory allocated for requests reasonably tight, try
to reuse the oldest request (so long as it is completed and has no
external references) for the next allocation.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_request.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index ce5f802e12d8..6ed30f8084ad 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -226,6 +226,13 @@ __i915_gem_request_alloc(struct intel_engine_cs *engine,
 	if (ret)
 		return ret;
 
+	if (!list_empty(&engine->request_list)) {
+		req = list_first_entry(&engine->request_list,
+				       typeof(*req), list);
+		if (i915_gem_request_completed(req))
+			i915_gem_request_retire(req);
+	}
+
 	req = kmem_cache_zalloc(dev_priv->requests, GFP_KERNEL);
 	if (!req)
 		return -ENOMEM;
-- 
2.8.1