[PATCH 08/13] drm/i915: Shrink the request kmem_cache on allocation error

Chris Wilson chris at chris-wilson.co.uk
Tue Jan 2 13:57:57 UTC 2018


If we fail to allocate a new request, make sure we recover the pages
that are in the process of being freed by inserting an RCU barrier.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_request.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index d575109f7a7f..b5213a926ced 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -689,6 +689,9 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
 		if (ret)
 			goto err_unreserve;
 
+		kmem_cache_shrink(dev_priv->requests);
+		rcu_barrier();
+
 		req = kmem_cache_alloc(dev_priv->requests, GFP_KERNEL);
 		if (!req) {
 			ret = -ENOMEM;
-- 
2.15.1



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