[torch.compile] Passing only necessary compilation config to inductor pass config (#27041)

Signed-off-by: Lu Fang <fanglu@fb.com>
Co-authored-by: Lucia (Lu) Fang <fanglu@meta.com>

tests/compile/test_config.py

@@ -1,8 +1,11 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import copy
+
 import pytest
 
 from vllm.compilation.counter import compilation_counter
+from vllm.compilation.fix_functionalization import FixFunctionalizationPass
 from vllm.config import CompilationConfig, CUDAGraphMode, VllmConfig
 from vllm.config.compilation import CompilationMode
 from vllm.utils import _is_torch_equal_or_newer, is_torch_equal_or_newer
@@ -25,6 +28,20 @@ def test_use_cudagraphs_dynamic():
     assert vllm_config.compilation_config.use_cudagraph
 
 
+def test_copy_pass():
+    vllm_config = VllmConfig()
+    inductor_pass = FixFunctionalizationPass(vllm_config)
+    copied_inductor_pass = copy.deepcopy(inductor_pass)
+    assert (
+        copied_inductor_pass.compilation_config.use_inductor_graph_partition
+        == vllm_config.compilation_config.use_inductor_graph_partition
+    )
+    assert (
+        copied_inductor_pass.compilation_config.splitting_ops
+        == vllm_config.compilation_config.splitting_ops
+    )
+
+
 def test_custom_op():
     # proper syntax
     _ = CompilationConfig(custom_ops=["+quant_fp8", "-silu_and_mul"])