From 6a860cfb3514e8d423ef1fac4b7205a4f53ef394 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Wed, 20 Mar 2024 21:02:33 -0700
Subject: [PATCH] ipn/ipnlocal: add c2n pprof option to force a GC

Like net/http/pprof has.

Updates tailscale/corp#18514

Change-Id: I264adb6dcf5732d19707783b29b7273b4ca69cf4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 ipn/ipnlocal/c2n_pprof.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ipn/ipnlocal/c2n_pprof.go b/ipn/ipnlocal/c2n_pprof.go
index 9341548ee..aacdbbc02 100644
--- a/ipn/ipnlocal/c2n_pprof.go
+++ b/ipn/ipnlocal/c2n_pprof.go
@@ -7,11 +7,17 @@ package ipnlocal
 
 import (
 	"net/http"
+	"runtime"
 	"runtime/pprof"
+	"strconv"
 )
 
 func init() {
 	c2nLogHeap = func(w http.ResponseWriter, r *http.Request) {
+		// Support same optional gc parameter as net/http/pprof:
+		if gc, _ := strconv.Atoi(r.FormValue("gc")); gc > 0 {
+			runtime.GC()
+		}
 		pprof.WriteHeapProfile(w)
 	}
 }