From d1ca25be49ab19232d650dd40f52e2dd7567b600 Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Sat, 14 Nov 2020 19:19:27 +0000
Subject: [PATCH] thread: pad tid lock

On a kernel with other changes this bumps 104-way thread creation/destruction
from 0.96 mln ops/s to 1.1 mln ops/s.
---
 sys/kern/kern_thread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c
index 4da09d63010..39fe0ce1235 100644
--- a/sys/kern/kern_thread.c
+++ b/sys/kern/kern_thread.c
@@ -135,7 +135,7 @@ static int thread_unsuspend_one(struct thread *td, struct proc *p,
     bool boundary);
 static void thread_free_batched(struct thread *td);
 
-static struct mtx tid_lock;
+static __exclusive_cache_line struct mtx tid_lock;
 static bitstr_t *tid_bitmap;
 
 static MALLOC_DEFINE(M_TIDHASH, "tidhash", "thread hash");