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Eliminate redundant check in hot path

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This commit is contained in:
Zejun Zhao
2025-03-05 14:07:22 +08:00
committed by Tate, Hongliang Tian
parent c1e6f9a552
commit 73e0b30785
1 changed files with 2 additions and 4 deletions
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6
kernel/src/sched/sched_class/mod.rs
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@ -322,11 +322,9 @@ impl LocalRunQueue for PerCpuClassRqSet {
fn pick_next_current(&mut self) -> Option<&Arc<Task>> { fn pick_next_current(&mut self) -> Option<&Arc<Task>> {
self.pick_next_entity().and_then(|next| { self.pick_next_entity().and_then(|next| {
let next_ptr = Arc::as_ptr(&next.0); // We guarantee that a task can appear at once in a `PerCpuClassRqSet`. So, the `next` cannot be the same
// as the current task here.
if let Some((old, _)) = self.current.replace((next, CurrentRuntime::new())) { if let Some((old, _)) = self.current.replace((next, CurrentRuntime::new())) {
if Arc::as_ptr(&old.0) == next_ptr {
return None;
}
self.enqueue_entity(old, None); self.enqueue_entity(old, None);
} }
self.current.as_ref().map(|((task, _), _)| task) self.current.as_ref().map(|((task, _), _)| task)