diff --git a/dnn/src/naive/pooling/opr_impl.cpp b/dnn/src/naive/pooling/opr_impl.cpp
index b0a5222d3a9d95bcc9137f6acef780aed6e53aea..c2d7d8e752c13d0ec70e792d7269cf2ef851b87e 100644
--- a/dnn/src/naive/pooling/opr_impl.cpp
+++ b/dnn/src/naive/pooling/opr_impl.cpp
@@ -370,65 +370,67 @@ void pooling_backward_max_impl(const ctype* __restrict src,
     }
 }
 
-}  // anonymous namespace
+}  // namespace
 
 namespace megdnn {
 namespace naive {
 
 void PoolingForwardImpl::exec(_megdnn_tensor_in src, _megdnn_tensor_out dst,
                               _megdnn_workspace workspace) {
-    MIDOUT_BEGIN(megdnn_naive_pooling) {
-        check_exec(src.layout, dst.layout, workspace.size);
-        size_t c_pos, spatial_pos, batch_pos = 0;
-        if (param().format == Param::Format::NCHW ||
-            param().format == Param::Format::NCHW4 ||
-            param().format == Param::Format::NCHW88 ||
-            param().format == Param::Format::NCHW44 ||
-            param().format == Param::Format::NCHW32) {
-            c_pos = 1;
-            spatial_pos = 2;
-        } else if (param().format == Param::Format::NHWC) {
-            c_pos = 3;
-            spatial_pos = 1;
-        } else if (param().format == Param::Format::CHWN4) {
-            c_pos = 0;
-            spatial_pos = 1;
-            batch_pos = 3;
-        } else {
-            megdnn_assert(param().format == Param::Format::NHWCD4);
-            c_pos = 2;
-            spatial_pos = 1;
-        }
-        size_t N = src.layout.shape[batch_pos], C = src.layout.shape[c_pos],
-               IH = src.layout.shape[spatial_pos + 0],
-               IW = src.layout.shape[spatial_pos + 1];
-        size_t OH = dst.layout.shape[spatial_pos + 0],
-               OW = dst.layout.shape[spatial_pos + 1];
-        if (param().format == Param::Format::NHWCD4) {
-            C *= 4;
-            IW = src.layout.shape[spatial_pos + 2];
-            OW = dst.layout.shape[spatial_pos + 2];
-        }
-        if (param().format == Param::Format::NCHW4 ||
-            param().format == Param::Format::NCHW44 ||
-            param().format == Param::Format::CHWN4) {
-            C *= 4;
-        }
-        if (param().format == Param::Format::NCHW88) {
-            C *= 8;
-        }
-        if (param().format == Param::Format::NCHW32) {
-            C *= 32;
-        }
-        size_t PH = param().pad_h, PW = param().pad_w;
-        size_t FH = param().window_h, FW = param().window_w;
-        size_t SH = param().stride_h, SW = param().stride_w;
-#define DISPATCH_WITH_POOLER_AND_IDX_GETTER(Pooler, IdxGetter)              \
-    MEGDNN_DISPATCH_CPU_KERN(                                               \
-            static_cast<naive::HandleImpl*>(handle()),                      \
-            pooling_forward_impl<Pooler MEGDNN_COMMA IdxGetter>(            \
-                    sptr, dptr, src.layout.dtype, N, C, IH, IW, OH, OW, PH, \
-                    PW, SH, SW, FH, FW));
+    check_exec(src.layout, dst.layout, workspace.size);
+    size_t c_pos, spatial_pos, batch_pos = 0;
+    if (param().format == Param::Format::NCHW ||
+        param().format == Param::Format::NCHW4 ||
+        param().format == Param::Format::NCHW88 ||
+        param().format == Param::Format::NCHW44 ||
+        param().format == Param::Format::NCHW32) {
+        c_pos = 1;
+        spatial_pos = 2;
+    } else if (param().format == Param::Format::NHWC) {
+        c_pos = 3;
+        spatial_pos = 1;
+    } else if (param().format == Param::Format::CHWN4) {
+        c_pos = 0;
+        spatial_pos = 1;
+        batch_pos = 3;
+    } else {
+        megdnn_assert(param().format == Param::Format::NHWCD4);
+        c_pos = 2;
+        spatial_pos = 1;
+    }
+    size_t N = src.layout.shape[batch_pos], C = src.layout.shape[c_pos],
+           IH = src.layout.shape[spatial_pos + 0],
+           IW = src.layout.shape[spatial_pos + 1];
+    size_t OH = dst.layout.shape[spatial_pos + 0],
+           OW = dst.layout.shape[spatial_pos + 1];
+    if (param().format == Param::Format::NHWCD4) {
+        C *= 4;
+        IW = src.layout.shape[spatial_pos + 2];
+        OW = dst.layout.shape[spatial_pos + 2];
+    }
+    if (param().format == Param::Format::NCHW4 ||
+        param().format == Param::Format::NCHW44 ||
+        param().format == Param::Format::CHWN4) {
+        C *= 4;
+    }
+    if (param().format == Param::Format::NCHW88) {
+        C *= 8;
+    }
+    if (param().format == Param::Format::NCHW32) {
+        C *= 32;
+    }
+    size_t PH = param().pad_h, PW = param().pad_w;
+    size_t FH = param().window_h, FW = param().window_w;
+    size_t SH = param().stride_h, SW = param().stride_w;
+#define DISPATCH_WITH_POOLER_AND_IDX_GETTER(Pooler, IdxGetter)                 \
+    MIDOUT_BEGIN(megdnn_naive_pooling, midout_iv(#Pooler #IdxGetter##_hash)) { \
+        MEGDNN_DISPATCH_CPU_KERN(                                              \
+                static_cast<naive::HandleImpl*>(handle()),                     \
+                pooling_forward_impl<Pooler MEGDNN_COMMA IdxGetter>(           \
+                        sptr, dptr, src.layout.dtype, N, C, IH, IW, OH, OW,    \
+                        PH, PW, SH, SW, FH, FW));                              \
+    }                                                                          \
+    MIDOUT_END();
 
 #define DISPATCH_WITH_POOLER(Pooler)                                      \
     switch (param().format) {                                             \
@@ -484,14 +486,12 @@ void PoolingForwardImpl::exec(_megdnn_tensor_in src, _megdnn_tensor_out dst,
             }                                                   \
         }                                                       \
     }
-        MEGDNN_FOREACH_COMPUTING_DTYPE(cb)
-        MEGDNN_FOREACH_QUANTIZED_DTYPE(cb)
+    MEGDNN_FOREACH_COMPUTING_DTYPE(cb)
+    MEGDNN_FOREACH_QUANTIZED_DTYPE(cb)
 #undef cb
 #undef DISPATCH_WITH_POOLER_AND_IDX_GETTER
 #undef DISPATCH_WITH_POOLER
-        megdnn_assert_internal(0);
-    }
-    MIDOUT_END();
+    megdnn_assert_internal(0);
 }
 
 WorkspaceBundle PoolingBackwardImpl::get_workspace_bundle(