When we finally decide the gpu is idle, that is a good time to shrink
our kmem_caches.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5ef0a18bf52c..8168c7c242a5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4711,6 +4711,21 @@ i915_gem_retire_work_handler(struct work_struct *work)
}
}
+static void shrink_caches(struct drm_i915_private *i915)
+{
+ /*
+ * kmem_cache_shrink() discards empty slabs and reorders partially
+ * filled slabs to prioritise allocating from the mostly full slabs,
+ * with the aim of reducing fragmentation.
+ */
+ kmem_cache_shrink(i915->priorities);
+ kmem_cache_shrink(i915->dependencies);
+ kmem_cache_shrink(i915->requests);
+ kmem_cache_shrink(i915->luts);
+ kmem_cache_shrink(i915->vmas);
+ kmem_cache_shrink(i915->objects);
+}
+
static inline bool
new_requests_since_last_retire(const struct drm_i915_private *i915)
{
@@ -4798,6 +4813,13 @@ i915_gem_idle_work_handler(struct work_struct *work)
GEM_BUG_ON(!dev_priv->gt.awake);
i915_queue_hangcheck(dev_priv);
}
+
+ rcu_barrier();
+
+ if (!new_requests_since_last_retire(dev_priv)) {
+ __i915_gem_free_work(&dev_priv->mm.free_work);
+ shrink_caches(dev_priv);
+ }
}
int i915_gem_suspend(struct drm_i915_private *dev_priv)
--
2.15.1
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