diff --git a/include/gui/IGraphicBufferConsumer.h b/include/gui/IGraphicBufferConsumer.h
index 4915478..3b10d78 100644
--- a/include/gui/IGraphicBufferConsumer.h
+++ b/include/gui/IGraphicBufferConsumer.h
@@ -272,6 +272,11 @@
     virtual status_t getOccupancyHistory(bool forceFlush,
             std::vector<OccupancyTracker::Segment>* outHistory) = 0;
 
+    // discardFreeBuffers releases all currently-free buffers held by the queue,
+    // in order to reduce the memory consumption of the queue to the minimum
+    // possible without discarding data.
+    virtual status_t discardFreeBuffers() = 0;
+
     // dump state into a string
     virtual void dump(String8& result, const char* prefix) const = 0;