Extract release_req and retract_all as module-level free functions (#26548)

python/sglang/srt/managers/schedule_batch.py

@@ -1492,6 +1492,53 @@ def set_mamba_track_indices_from_reqs(batch):
     )
 
 
+def release_req(
+    *,
+    req: Req,
+    remaing_req_count: int,
+    server_args: ServerArgs,
+    req_to_token_pool: ReqToTokenPool,
+    token_to_kv_pool_allocator: BaseTokenToKVPoolAllocator,
+    tree_cache: BasePrefixCache,
+    hisparse_coordinator: Optional[HiSparseCoordinator],
+) -> None:
+    if hisparse_coordinator is not None and not req.finished():
+        hisparse_coordinator.retract_req(req)
+
+    if server_args.disaggregation_mode == "decode":
+        req.offload_kv_cache(req_to_token_pool, token_to_kv_pool_allocator)
+    # TODO (csy): for preempted requests, we may want to insert into the tree
+    release_kv_cache(req, tree_cache, is_insert=False)
+    # NOTE(lsyin): we should use the newly evictable memory instantly.
+    num_tokens = remaing_req_count * envs.SGLANG_RETRACT_DECODE_STEPS.get()
+    evict_from_tree_cache(tree_cache, num_tokens)
+
+    req.reset_for_retract()
+
+
+def retract_all(
+    *,
+    reqs: List[Req],
+    server_args: ServerArgs,
+    req_to_token_pool: ReqToTokenPool,
+    token_to_kv_pool_allocator: BaseTokenToKVPoolAllocator,
+    tree_cache: BasePrefixCache,
+    hisparse_coordinator: Optional[HiSparseCoordinator],
+) -> List[Req]:
+    retracted_reqs = reqs
+    for idx in range(len(reqs)):
+        release_req(
+            req=reqs[idx],
+            remaing_req_count=len(reqs) - idx,
+            server_args=server_args,
+            req_to_token_pool=req_to_token_pool,
+            token_to_kv_pool_allocator=token_to_kv_pool_allocator,
+            tree_cache=tree_cache,
+            hisparse_coordinator=hisparse_coordinator,
+        )
+    return retracted_reqs
+
+
 def _compute_chunked_req_next_prompt_token(
     chunked_req: Optional[Req],
 ) -> Optional[int]:
@@ -2292,10 +2339,14 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
         return self.token_to_kv_pool_allocator.available_size() >= num_tokens
 
     def retract_all(self, server_args: ServerArgs):
-        retracted_reqs = self.reqs
-        for idx in range(len(self.reqs)):
-            self.release_req(idx, len(self.reqs) - idx, server_args)
-
+        retracted_reqs = retract_all(
+            reqs=self.reqs,
+            server_args=server_args,
+            req_to_token_pool=self.req_to_token_pool,
+            token_to_kv_pool_allocator=self.token_to_kv_pool_allocator,
+            tree_cache=self.tree_cache,
+            hisparse_coordinator=self.hisparse_coordinator,
+        )
         self.reqs = []
         return retracted_reqs
 
@@ -2364,22 +2415,15 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
         return retracted_reqs, new_estimate_ratio, reqs_to_abort
 
     def release_req(self, idx: int, remaing_req_count: int, server_args: ServerArgs):
-        req = self.reqs[idx]
-
-        if self.hisparse_coordinator is not None and not req.finished():
-            self.hisparse_coordinator.retract_req(req)
-
-        if server_args.disaggregation_mode == "decode":
-            req.offload_kv_cache(
-                self.req_to_token_pool, self.token_to_kv_pool_allocator
-            )
-        # TODO (csy): for preempted requests, we may want to insert into the tree
-        release_kv_cache(req, self.tree_cache, is_insert=False)
-        # NOTE(lsyin): we should use the newly evictable memory instantly.
-        num_tokens = remaing_req_count * envs.SGLANG_RETRACT_DECODE_STEPS.get()
-        evict_from_tree_cache(self.tree_cache, num_tokens)
-
-        req.reset_for_retract()
+        release_req(
+            req=self.reqs[idx],
+            remaing_req_count=remaing_req_count,
+            server_args=server_args,
+            req_to_token_pool=self.req_to_token_pool,
+            token_to_kv_pool_allocator=self.token_to_kv_pool_allocator,
+            tree_cache=self.tree_cache,
+            hisparse_coordinator=self.hisparse_coordinator,
+        )
 
     def prepare_encoder_info_decode(self):
         # Reset the encoder cached status