From 49e744c65c8e3d2f72357f865dbd1908796950cf Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 12 Aug 2025 22:06:41 -0400
Subject: kernel: proc: Improve handling of 'nswitch'

- Extend 'nswitch' to 64-bits as it increments fast
- Ensure writes to 'nswitch' are atomic

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/proc_machdep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'sys/arch')

diff --git a/sys/arch/amd64/amd64/proc_machdep.c b/sys/arch/amd64/amd64/proc_machdep.c
index ad807fe..a1d6563 100644
--- a/sys/arch/amd64/amd64/proc_machdep.c
+++ b/sys/arch/amd64/amd64/proc_machdep.c
@@ -256,7 +256,7 @@ sched_switch_to(struct trapframe *tf, struct proc *td)
 
     /* Update stats */
     cpustat = &ci->stat;
-    cpustat->nswitch++;
+    atomic_inc_64(&cpustat->nswitch);
 
     ci->curtd = td;
     pcbp = &td->pcb;
-- 
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