pass data size to copy policy function too

offloading-cacher/cache.hpp

@@ -191,7 +191,7 @@ namespace dsacache {
         // copy policy specifies the copy-executing nodes for a given task
         // which allows flexibility in assignment for optimizing raw throughput
         // or choosing a conservative usage policy
-        typedef std::vector<int> (CopyPolicy)(const int numa_dst_node, const int numa_src_node);
+        typedef std::vector<int> (CopyPolicy)(const int numa_dst_node, const int numa_src_node, const size_t data_size);
 
     private:
         // mutex for accessing the cache state map
@@ -396,7 +396,7 @@ inline void dsacache::Cache::SubmitTask(CacheData* task, const int dst_node, con
 
     // querry copy policy function for the nodes to use for the copy
 
-    const std::vector<int> executing_nodes = copy_policy_function_(dst_node, src_node);
+    const std::vector<int> executing_nodes = copy_policy_function_(dst_node, src_node, task->size_);
     const size_t task_count = executing_nodes.size();
 
     // each task will copy one fair part of the total size