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ke/sched: fix promotion path

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Threads that get promoted should preempt the next thread if possible.
This commit is contained in:
Loïc Grégoire
2026-07-23 16:37:30 -04:00
parent 00ae1a21f2
commit 85b0ee5320
1 changed files with 13 additions and 2 deletions
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src/kern/sched.zig
+13 -2
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@@ -591,8 +591,19 @@ pub fn update_priority_locked(td: *ke.Thread, new_prio: u8) void {
cpu.current_thread_prio.store(new_prio, .monotonic); cpu.current_thread_prio.store(new_prio, .monotonic);
// Do nothing else on promotion. // On promotion, check if a thread was already selection for preemption,
if (new_prio >= old_prio) return; // if we now preempt that thread, then insert it back into its queue.
if (new_prio > old_prio) {
if (cpu.next_thread) |n| {
if (should_prio_preempt(td, n.priority, false)) {
cpu.next_thread = null;
insert_in_queue(cpu, n, true);
n.cpu = c;
cpu.preemption_reason = .None;
}
}
return;
}
// Demotion: try to preempt the thread if possible. // Demotion: try to preempt the thread if possible.
if (cpu.next_thread != null) return; if (cpu.next_thread != null) return;