code review 128380043: runtime: fix MemStats on 32-bits

src/pkg/runtime/gc_test.go

 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package runtime_test
 
 import (
         "os"
         "runtime"
         "runtime/debug"
@@ skipping 146 matching lines @@
 func TestGcLastTime(t *testing.T) {
         ms := new(runtime.MemStats)
         t0 := time.Now().UnixNano()
         runtime.GC()
         t1 := time.Now().UnixNano()
         runtime.ReadMemStats(ms)
         last := int64(ms.LastGC)
         if t0 > last || last > t1 {
                 t.Fatalf("bad last GC time: got %v, want [%v, %v]", last, t0, t1)
         }
+        pause := ms.PauseNs[(ms.NumGC+255)%256]
+        if pause == 0 || pause > 10e9 {
+                t.Fatalf("bad last GC pause: got %v, want [0, 10e9]", pause)
+        }
 }
 
 var hugeSink interface{}
 
 func TestHugeGCInfo(t *testing.T) {
         // The test ensures that compiler can chew these huge types even on weakest machines.
         // The types are not allocated at runtime.
         if hugeSink != nil {
                 // 400MB on 32 bots, 4TB on 64-bits.
                 const n = (400 << 20) + (unsafe.Sizeof(uintptr(0))-4)<<40
@@ skipping 98 matching lines @@
                         }
                 }
         }()
         for i := 0; i < 1e4; i++ {
                 func() {
                         defer print("")
                 }()
         }
         close(done)
 }