diff --git a/Cargo.lock b/Cargo.lock
index 837b0a9bd..82dd27107 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -646,6 +646,7 @@ dependencies = [
 name = "hyperion-kernel"
 version = "0.1.0"
 dependencies = [
+ "arcstr",
  "crossbeam",
  "futures-util",
  "hyperion-arch",
diff --git a/crates/kernel/Cargo.toml b/crates/kernel/Cargo.toml
index e41a58009..e33ebe44d 100644
--- a/crates/kernel/Cargo.toml
+++ b/crates/kernel/Cargo.toml
@@ -14,6 +14,7 @@ multiboot2 = []
 # Pick limine OR bootboot OR multiboot1 OR multiboot2, they conflict with eachother
 
 [dependencies]
+arcstr.workspace = true
 spin.workspace = true
 x86_64.workspace = true
 time.workspace = true
diff --git a/crates/kernel/src/testfw.rs b/crates/kernel/src/testfw.rs
index f1a5b4408..df9ebb36f 100644
--- a/crates/kernel/src/testfw.rs
+++ b/crates/kernel/src/testfw.rs
@@ -2,9 +2,10 @@
 
 // extern crate test;
 
-use alloc::{borrow::Cow, format, string::String};
+use alloc::{format, string::String};
 use core::{any::type_name, panic::PanicInfo};
 
+use arcstr::ArcStr;
 use crossbeam::queue::SegQueue;
 use hyperion_log::{print, println, LogLevel};
 use hyperion_scheduler::yield_now;
@@ -62,7 +63,7 @@ pub fn test_runner(tests: &'static [&'static dyn TestCase]) {
         hyperion_scheduler::spawn(move || {
             let name = test.name();
             // println!("running {name}");
-            hyperion_scheduler::rename(name.into());
+            hyperion_scheduler::rename(name);
 
             test.run();
 
@@ -79,7 +80,7 @@ pub fn test_runner(tests: &'static [&'static dyn TestCase]) {
     }
 
     hyperion_scheduler::spawn(move || {
-        hyperion_scheduler::rename("testfw waiter".into());
+        hyperion_scheduler::rename("testfw waiter");
 
         let mut completed = 0;
 
@@ -126,7 +127,7 @@ pub fn test_panic_handler(info: &PanicInfo) -> ! {
 
 //
 
-static RESULTS: SegQueue<(Cow<'static, str>, Option<String>)> = SegQueue::new();
+static RESULTS: SegQueue<(ArcStr, Option<String>)> = SegQueue::new();
 
 //
 
diff --git a/crates/scheduler/src/lib.rs b/crates/scheduler/src/lib.rs
index ed2c40ee9..168da4032 100644
--- a/crates/scheduler/src/lib.rs
+++ b/crates/scheduler/src/lib.rs
@@ -258,7 +258,7 @@ fn cpu_time_elapsed() -> u64 {
     let now = HPET.nanos() as u64;
     let last = last_time().swap(now, Ordering::SeqCst);
 
-    now - last
+    now.saturating_sub(last)
 }
 
 fn reset_cpu_timer() {