From 31289436f5ccf0d5d17a77087135d16430761e3d Mon Sep 17 00:00:00 2001
From: "Justin C. Miller" <justin@devjustinian.com>
Date: Sun, 7 Feb 2021 23:52:06 -0800
Subject: [PATCH] [kernel] Use PAUSE in spinwait

Using PAUSE in a tight loop allows other logical cores on the same
physical core to make use of more of the core's resources.
---
 src/kernel/clock.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/clock.cpp b/src/kernel/clock.cpp
index 44e1976..cca852a 100644
--- a/src/kernel/clock.cpp
+++ b/src/kernel/clock.cpp
@@ -17,6 +17,6 @@ void
 clock::spinwait(uint64_t us) const
 {
 	uint64_t when = value() + us;
-	while (value() < when);
+	while (value() < when) asm ("pause");
 }