runtime/debug: make TestFreeOSMemory repeatable

Fixes #4835.

R=golang-dev, fullung
CC=golang-dev
https://golang.org/cl/7319050

diff --git a/src/pkg/runtime/debug/garbage_test.go b/src/pkg/runtime/debug/garbage_test.go
index b8e2d622a6b5b48124762dc4629c18a2be56c3bf..ba536c746f5172e773bc356eaca06e5ce8c19224 100644 (file)
--- a/src/pkg/runtime/debug/garbage_test.go
+++ b/src/pkg/runtime/debug/garbage_test.go
@@ -71,11 +71,12 @@ func TestReadGCStats(t *testing.T) {
        }
 }
 
-var big = make([]byte, 1<<20)
+var big []byte
 
 func TestFreeOSMemory(t *testing.T) {
        var ms1, ms2 runtime.MemStats
 
+       big = make([]byte, 1<<20)
        big = nil
        runtime.GC()
        runtime.ReadMemStats(&ms1)