[Plugin] Make plugin group clear (#26757)

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm/platforms/__init__.py

@@ -6,7 +6,7 @@ from itertools import chain
 from typing import TYPE_CHECKING
 
 from vllm import envs
-from vllm.plugins import load_plugins_by_group
+from vllm.plugins import PLATFORM_PLUGINS_GROUP, load_plugins_by_group
 from vllm.utils import resolve_obj_by_qualname, supports_xccl
 
 from .interface import CpuArchEnum, Platform, PlatformEnum
@@ -188,7 +188,7 @@ builtin_platform_plugins = {
 
 
 def resolve_current_platform_cls_qualname() -> str:
-    platform_plugins = load_plugins_by_group("vllm.platform_plugins")
+    platform_plugins = load_plugins_by_group(PLATFORM_PLUGINS_GROUP)
 
     activated_plugins = []
 

vllm/plugins/__init__.py

@@ -9,7 +9,14 @@ import vllm.envs as envs
 
 logger = logging.getLogger(__name__)
 
+# Default plugins group will be loaded in all processes(process0, engine core
+# process and worker processes)
 DEFAULT_PLUGINS_GROUP = "vllm.general_plugins"
+# IO processor plugins group will be loaded in process0 only
+IO_PROCESSOR_PLUGINS_GROUP = "vllm.io_processor_plugins"
+# Platform plugins group will be loaded in all processes when
+# `vllm.platforms.current_platform` is called and the value not initialized,
+PLATFORM_PLUGINS_GROUP = "vllm.platform_plugins"
 
 # make sure one process only loads plugins once
 plugins_loaded = False

vllm/plugins/io_processors/__init__.py

@@ -4,7 +4,7 @@
 import logging
 
 from vllm.config import VllmConfig
-from vllm.plugins import load_plugins_by_group
+from vllm.plugins import IO_PROCESSOR_PLUGINS_GROUP, load_plugins_by_group
 from vllm.plugins.io_processors.interface import IOProcessor
 from vllm.utils import resolve_obj_by_qualname
 
@@ -37,7 +37,7 @@ def get_io_processor(
 
     # Load all installed plugin in the group
     multimodal_data_processor_plugins = load_plugins_by_group(
-        "vllm.io_processor_plugins"
+        IO_PROCESSOR_PLUGINS_GROUP
     )
 
     loadable_plugins = {}