test: Reduce size of test_bitmap

`test_bitmap` invoked with `AtomicBitmapArc` in `miri` test took very
long to complete, which exceeds the time limit of Buildkit agent.

Reduced the size of `AtomicBitmap`.

Signed-off-by: Ruoqing He <[email protected]>

Author: RuoqingHe

src/bitmap/backend/atomic_bitmap.rs

@@ -275,7 +275,7 @@ mod tests {
 
     #[test]
     fn test_bitmap_impl() {
-        let b = AtomicBitmap::new(0x2000, DEFAULT_PAGE_SIZE);
+        let b = AtomicBitmap::new(0x800, DEFAULT_PAGE_SIZE);
         test_bitmap(&b);
     }
 }

src/bitmap/backend/atomic_bitmap_arc.rs

@@ -82,7 +82,7 @@ mod tests {
     #[test]
     fn test_bitmap_impl() {
         // SAFETY: `128` is non-zero.
-        let b = AtomicBitmapArc::new(AtomicBitmap::new(0x2000, unsafe {
+        let b = AtomicBitmapArc::new(AtomicBitmap::new(0x800, unsafe {
             NonZeroUsize::new_unchecked(128)
         }));
         test_bitmap(&b);

src/bitmap/backend/slice.rs

@@ -103,8 +103,8 @@ mod tests {
 
     #[test]
     fn test_slice() {
-        let bitmap_size = 0x1_0000;
-        let dirty_offset = 0x1000;
+        let bitmap_size = 0x800;
+        let dirty_offset = 0x400;
         let dirty_len = 0x100;
 
         {

src/bitmap/mod.rs

@@ -140,10 +140,10 @@ pub(crate) mod tests {
     }
 
     // Helper method that tests a generic `B: Bitmap` implementation. It assumes `b` covers
-    // an area of length at least 0x2000.
+    // an area of length at least 0x800.
     pub fn test_bitmap<B: Bitmap>(b: &B) {
-        let len = 0x2000;
-        let dirty_offset = 0x1000;
+        let len = 0x800;
+        let dirty_offset = 0x400;
         let dirty_len = 0x100;
 
         // Some basic checks.