diff --git a/comfy_execution/caching.py b/comfy_execution/caching.py
index 5a8856aba..bbfbd2ce8 100644
--- a/comfy_execution/caching.py
+++ b/comfy_execution/caching.py
@@ -1,4 +1,5 @@
 import bisect
+import os
 import gc
 import itertools
 import psutil
@@ -382,45 +383,47 @@ class RAMPressureCache(LRUCache):
         return super().get(node_id)
 
     def poll(self, ram_headroom):
-        def _ram_gb():
-            """读取容器可用内存（GB），优先从 cgroup v2/v1 读取"""
-            # === 容器内存检测核心逻辑 ===
-            # 1. 尝试读取 cgroup v2 内存限制（Docker/K8s 主流）
-            cgroup_mem_limit_path = "/sys/fs/cgroup/memory.max"
-            cgroup_mem_usage_path = "/sys/fs/cgroup/memory.current"
-            
-            # 兼容 cgroup v1
-            if not os.path.exists(cgroup_mem_limit_path):
-                cgroup_mem_limit_path = "/sys/fs/cgroup/memory/memory.limit_in_bytes"
-                cgroup_mem_usage_path = "/sys/fs/cgroup/memory/memory.usage_in_bytes"
-
-            # 读取内存限制（字节）
-            try:
-                with open(cgroup_mem_limit_path, "r") as f:
-                    mem_limit = int(f.read().strip())
-                    # cgroup v1 中 limit_in_bytes 为 9223372036854771712 表示无限制， fallback 到系统内存
-                    if mem_limit == 9223372036854771712:
-                        mem_limit = psutil.virtual_memory().total
-            except (FileNotFoundError, ValueError):
-                mem_limit = psutil.virtual_memory().total
-
-            # 读取已使用内存（字节）
-            try:
-                with open(cgroup_mem_usage_path, "r") as f:
-                    mem_used = int(f.read().strip())
-            except (FileNotFoundError, ValueError):
-                mem_used = psutil.virtual_memory().total - psutil.virtual_memory().available
-
-            # 计算可用内存（GB）
-            mem_available = mem_limit - mem_used
-            return mem_available / (1024**3)
-        # === 替换结束 ===
-
-        if _ram_gb() > ram_headroom:
-            return
-        gc.collect()
-        if _ram_gb() > ram_headroom:
-            return
+	def _ram_gb():
+		fallback_to_host_available = False
+		cgroup_mem_limit_path = "/sys/fs/cgroup/memory.max"
+		cgroup_mem_usage_path = "/sys/fs/cgroup/memory.current"
+		
+		if not os.path.exists(cgroup_mem_limit_path):
+			cgroup_mem_limit_path = "/sys/fs/cgroup/memory/memory.limit_in_bytes"
+			cgroup_mem_usage_path = "/sys/fs/cgroup/memory/memory.usage_in_bytes"
+	
+		try:
+			with open(cgroup_mem_limit_path, "r") as f:
+				raw_limit = f.read().strip()
+				if raw_limit == "max":
+					fallback_to_host_available = True
+					mem_limit = psutil.virtual_memory().total
+				else:
+					mem_limit = int(raw_limit)
+					if mem_limit == 9223372036854771712:
+						fallback_to_host_available = True
+						mem_limit = psutil.virtual_memory().total
+		except (FileNotFoundError, ValueError):
+			fallback_to_host_available = True
+			mem_limit = psutil.virtual_memory().total
+	
+		if fallback_to_host_available:
+			return psutil.virtual_memory().available / (1024**3)
+	
+		try:
+			with open(cgroup_mem_usage_path, "r") as f:
+				mem_used = int(f.read().strip())
+		except (FileNotFoundError, ValueError):
+			mem_used = psutil.virtual_memory().total - psutil.virtual_memory().available
+	
+		mem_available = max(0, mem_limit - mem_used)
+		return mem_available / (1024**3)
+	
+	if _ram_gb() > ram_headroom:
+		return
+	gc.collect()
+	if _ram_gb() > ram_headroom:
+		return
 
         clean_list = []