From d7c7f87432aa2d20eefd3b4f38a78eba5e7373a0 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 10 Jul 2025 03:20:13 -0400
Subject: kernel: sched: Greatly simplify yield logic

The purpose of yielding to the scheduler is to tell it you want to
preempt early in order to not starve processes while waiting for I/O. We
can trigger the timer earlier on for stability as a ~10 usec delay
should not be too terrible.

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_sched.c | 19 -------------------
 1 file changed, 19 deletions(-)

(limited to 'sys')

diff --git a/sys/kern/kern_sched.c b/sys/kern/kern_sched.c
index 774ba71..30036c0 100644
--- a/sys/kern/kern_sched.c
+++ b/sys/kern/kern_sched.c
@@ -258,27 +258,8 @@ sched_enter(void)
 void
 sched_yield(void)
 {
-    struct proc *td;
-    struct cpu_info *ci = this_cpu();
-
-    if ((td = ci->curtd) == NULL) {
-        return;
-    }
-
-    td->rested = true;
-
-    /* FIXME: Hang yielding when waited on */
-    if (ISSET(td->flags, PROC_WAITED)) {
-        return;
-    }
-
-    ci->curtd = NULL;
     md_inton();
     sched_oneshot(false);
-
-    md_hlt();
-    md_intoff();
-    ci->curtd = td;
 }
 
 void
-- 
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