doc/next: document cgo call overhead improvement

Change-Id: Ibac18513d2f76172665b4f3a4ea09b69ae0bdef3
Reviewed-on: https://go-review.googlesource.com/c/go/+/725664
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>

diff --git a/doc/next/4-runtime.md b/doc/next/4-runtime.md
index d8fcb8f9ee9fa764e8bf5686597a20baae0e0acd..4f7c1b0a1f7d92eb08a2d6a9fc639ec500df6b87 100644 (file)
--- a/doc/next/4-runtime.md
+++ b/doc/next/4-runtime.md
@@ -20,3 +20,9 @@ The new garbage collector may be disabled by setting
 This opt-out setting is expected to be removed in Go 1.27.
 If you disable the new garbage collector for any reason related to its
 performance or behavior, please [file an issue](/issue/new).
+
+### Faster cgo calls
+
+<!-- CL 646198 -->
+
+The baseline runtime overhead of cgo calls has been reduced by ~30%.