From 78a3968c2c9f2d6e8eb6dc263b4a2517c72d71be Mon Sep 17 00:00:00 2001
From: Michael Anthony Knyszek <mknyszek@google.com>
Date: Thu, 24 Jul 2025 21:38:37 +0000
Subject: runtime/metrics: add metric for current Go-owned thread count

Fixes #15490.

Change-Id: I6ce9edc46398030ff639e22d4ca4adebccdfe1b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/690399
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
---
 src/runtime/runtime2.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/runtime/runtime2.go')

diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go
index a80a34a18e..042c3137cd 100644
--- a/src/runtime/runtime2.go
+++ b/src/runtime/runtime2.go
@@ -1225,7 +1225,9 @@ var isIdleInSynctest = [len(waitReasonStrings)]bool{
 }
 
 var (
-	allm          *m
+	// Linked-list of all Ms. Written under sched.lock, read atomically.
+	allm *m
+
 	gomaxprocs    int32
 	numCPUStartup int32
 	forcegc       forcegcstate
-- 
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