runtime: fix GODEBUG=schedtrace=X delay handling.

debug.schedtrace is an int32. Convert it to int64 before
multiplying with constant 1000000. Otherwise, schedtrace
values more than 2147 result in int32 overflow causing
incorrect delays between traces.

Change-Id: I064e8d7b432c1e892a705ee1f31a2e8cdd2c3ea3
Reviewed-on: https://go-review.googlesource.com/17712
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index f641d38a943e8423864b58b9731d8779125f0ff3..9ef7bfb9541c8d4c400411eeaae3156696c5268f 100644 (file)
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -3413,7 +3413,7 @@ func sysmon() {
                        lastscavenge = now
                        nscavenge++
                }
-               if debug.schedtrace > 0 && lasttrace+int64(debug.schedtrace*1000000) <= now {
+               if debug.schedtrace > 0 && lasttrace+int64(debug.schedtrace)*1000000 <= now {
                        lasttrace = now
                        schedtrace(debug.scheddetail > 0)
                }