From 57cd7738c29e1f1bc7ceb0b73b06884902a79696 Mon Sep 17 00:00:00 2001
From: David Anderson <danderson@tailscale.com>
Date: Tue, 8 Dec 2020 16:45:34 -0800
Subject: [PATCH] tsweb: add an endpoint to manually trigger a GC.

Signed-off-by: David Anderson <danderson@tailscale.com>
---
 tsweb/tsweb.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tsweb/tsweb.go b/tsweb/tsweb.go
index 134f034cf..411e615a4 100644
--- a/tsweb/tsweb.go
+++ b/tsweb/tsweb.go
@@ -44,6 +44,16 @@ func registerCommonDebug(mux *http.ServeMux) {
 	mux.Handle("/debug/pprof/", Protected(http.DefaultServeMux)) // to net/http/pprof
 	mux.Handle("/debug/vars", Protected(http.DefaultServeMux))   // to expvar
 	mux.Handle("/debug/varz", Protected(http.HandlerFunc(varzHandler)))
+	mux.Handle("/debug/gc", Protected(http.HandlerFunc(gcHandler)))
+}
+
+func gcHandler(w http.ResponseWriter, r *http.Request) {
+	w.Write([]byte("running GC...\n"))
+	if f, ok := w.(http.Flusher); ok {
+		f.Flush()
+	}
+	runtime.GC()
+	w.Write([]byte("Done.\n"))
 }
 
 func DefaultCertDir(leafDir string) string {