Upstreaming hicache bug fixes (#7267)

python/sglang/srt/mem_cache/hiradix_cache.py

@@ -307,7 +307,9 @@ class HiRadixCache(RadixCache):
         return last_node, prefix_indices
 
     def ready_to_load_cache(self):
+        producer_index = self.cache_controller.layer_done_counter.next_producer()
         self.load_cache_event.set()
+        return producer_index
 
     def match_prefix(self, key: List[int], include_evicted=False, **kwargs):
         empty_value = torch.empty((0,), dtype=torch.int64, device=self.device)
@@ -372,6 +374,7 @@ class HiRadixCache(RadixCache):
         new_node.lock_ref = child.lock_ref
         new_node.key = child.key[:split_len]
         new_node.loading = child.loading
+        new_node.hit_count = child.hit_count
 
         # split value and host value if exists
         if child.evicted: