From 9f75ecd5e12f2b9988086954933d610cd5647918 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@golang.org>
Date: Tue, 6 Dec 2016 19:55:10 +0000
Subject: [PATCH] runtime/debug: don't run a GC when setting SetGCPercent
 negative

If the user is calling SetGCPercent(-1), they intend to disable GC.
They probably don't intend to run one. If they do, they can call
runtime.GC themselves.

Change-Id: I40ef40dfc7e15193df9ff26159cd30e56b666f73
Reviewed-on: https://go-review.googlesource.com/34013
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
---
 src/runtime/debug/garbage.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/runtime/debug/garbage.go b/src/runtime/debug/garbage.go
index c82c024235b..27adc70fd3c 100644
--- a/src/runtime/debug/garbage.go
+++ b/src/runtime/debug/garbage.go
@@ -90,7 +90,9 @@ func ReadGCStats(stats *GCStats) {
 // A negative percentage disables garbage collection.
 func SetGCPercent(percent int) int {
 	old := setGCPercent(int32(percent))
-	runtime.GC()
+	if percent >= 0 {
+		runtime.GC()
+	}
 	return int(old)
 }