[PATCH 04/10] drm/i915: Shrink the request kmem_cache on allocation error

From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 04/10] drm/i915: Shrink the request kmem_cache on allocation error
Date: Mon, 15 Jan 2018 21:24:49 +0000	[thread overview]
Message-ID: <20180115212455.24046-5-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20180115212455.24046-1-chris@chris-wilson.co.uk>

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@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 72bdc203716f..e6d4857b1f78 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -696,6 +696,9 @@ 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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