diff --git a/services/libs/jinux-std/src/vm/vmo/mod.rs b/services/libs/jinux-std/src/vm/vmo/mod.rs
index 535def9e1..2098ba77c 100644
--- a/services/libs/jinux-std/src/vm/vmo/mod.rs
+++ b/services/libs/jinux-std/src/vm/vmo/mod.rs
@@ -127,23 +127,11 @@ bitflags! {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum VmoType {
-    /// This vmo_ is created as a copy on write child
-    CopyOnWriteChild,
-    /// This vmo_ is created as a slice child
-    SliceChild,
-    /// This vmo_ is not created as a child of a parent vmo
-    NotChild,
-}
-
 pub(super) struct Vmo_ {
     /// Flags
     flags: VmoFlags,
     /// VmoInner
     inner: Mutex<VmoInner>,
-    /// vmo type
-    vmo_type: VmoType,
 }
 
 struct VmoInner {
@@ -321,6 +309,14 @@ impl VmoInner {
 
         Ok(frame)
     }
+
+    fn is_cow_child(&self) -> bool {
+        if let Some(inherited_pages) = &self.inherited_pages {
+            inherited_pages.is_copy_on_write
+        } else {
+            false
+        }
+    }
 }
 
 impl Vmo_ {
@@ -474,7 +470,7 @@ impl<R> Vmo<R> {
     }
 
     pub fn is_cow_child(&self) -> bool {
-        self.0.vmo_type == VmoType::CopyOnWriteChild
+        self.0.inner.lock().is_cow_child()
     }
 }
 
diff --git a/services/libs/jinux-std/src/vm/vmo/options.rs b/services/libs/jinux-std/src/vm/vmo/options.rs
index 4bd58e20f..fa554cb05 100644
--- a/services/libs/jinux-std/src/vm/vmo/options.rs
+++ b/services/libs/jinux-std/src/vm/vmo/options.rs
@@ -11,7 +11,6 @@ use typeflags_util::{SetExtend, SetExtendOp};
 use crate::prelude::*;
 
 use crate::vm::vmo::InheritedPages;
-use crate::vm::vmo::VmoType;
 use crate::vm::vmo::{VmoInner, Vmo_};
 use jinux_rights::{Dup, Rights, TRightSet, TRights, Write};
 
@@ -136,7 +135,6 @@ fn alloc_vmo_(size: usize, flags: VmoFlags, pager: Option<Arc<dyn Pager>>) -> Re
     Ok(Vmo_ {
         flags,
         inner: Mutex::new(vmo_inner),
-        vmo_type: VmoType::NotChild,
     })
 }
 
@@ -499,14 +497,9 @@ fn alloc_child_vmo_(
         committed_pages: BTreeMap::new(),
         inherited_pages: Some(inherited_pages),
     };
-    let vmo_type = match child_type {
-        ChildType::Cow => VmoType::CopyOnWriteChild,
-        ChildType::Slice => VmoType::SliceChild,
-    };
     Ok(Vmo_ {
         flags: child_flags,
         inner: Mutex::new(vmo_inner),
-        vmo_type,
     })
 }