perf(kernel::rendy): do not over-allocate

Regresssion. In future, the `alloc_boxed_buffer` must be fully removed.
The zeroing is also not required.

Signed-off-by: Anhad Singh <[email protected]>

Author: Andy-Python-Programmer

.gitignore

@@ -34,3 +34,4 @@ host-pkgs/
 host-builds/
 pkgs/
 builds/
+raw-data

Makefile

@@ -48,7 +48,7 @@ qemu: $(KERNEL_TARGET) $(USERLAND_TARGET)
 
 .PHONY: qemu_perf
 qemu_perf: $(KERNEL_TARGET) $(USERLAND_TARGET)
-	${QEMU_PATH}/qemu-system-x86_64 -cdrom target/aero.iso -m 8G -serial stdio --boot d -s -drive file=target/disk.img,if=none,id=NVME1,format=raw -device nvme,drive=NVME1,serial=nvme -plugin './target/kern-profile.so,out=raw-data,delay=30' -d plugin -cpu max
+	${QEMU_PATH}/qemu-system-x86_64 -cdrom target/aero.iso -m 8G -serial stdio --boot d -s -drive file=target/disk.img,if=none,id=NVME1,format=raw -device nvme,drive=NVME1,serial=nvme -plugin './target/kern-profile.so,out=raw-data,delay=25' -d plugin -cpu max
 
 .PHONY: qemu_p
 qemu_p:

src/aero_kernel/src/rendy.rs

@@ -738,17 +738,10 @@ impl<'this> DebugRendy<'this> {
         let cols = (width - DEFAULT_MARGIN * 2) / FONT_WIDTH;
         let rows = (height - DEFAULT_MARGIN * 2) / FONT_HEIGHT;
 
-        let grid_size = rows * cols * core::mem::size_of::<Character>();
-        let grid = mem::alloc_boxed_buffer::<Character>(grid_size);
-
-        let queue_size = rows * cols * core::mem::size_of::<QueueCharacter>();
-        let queue = mem::alloc_boxed_buffer::<QueueCharacter>(queue_size);
-
-        let map_size = rows * cols * core::mem::size_of::<Option<*const QueueCharacter>>();
-        let map = mem::alloc_boxed_buffer::<Option<*mut QueueCharacter>>(map_size);
-
-        let bg_canvas_size = width * height * core::mem::size_of::<u32>();
-        let bg_canvas = mem::alloc_boxed_buffer::<u32>(bg_canvas_size);
+        let grid = mem::alloc_boxed_buffer::<Character>(rows * cols);
+        let queue = mem::alloc_boxed_buffer::<QueueCharacter>(rows * cols);
+        let map = mem::alloc_boxed_buffer::<Option<*mut QueueCharacter>>(rows * cols);
+        let bg_canvas = mem::alloc_boxed_buffer::<u32>(width * height);
 
         let mut this = Self {
             inner: Inner {