From 8f82bff545ed7d1f432038b7ad97e46c4bb5cf77 Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Fri, 16 Nov 2012 20:06:11 +0400
Subject: [PATCH] runtime: hide mheap from race detector This significantly
 decreases amount of shadow memory mapped by race detector. I haven't tested
 on Windows, but on Linux it reduces virtual memory size from 1351m to 330m
 for fmt.test. Fixes #4379.

R=golang-dev, alex.brainman, iant
CC=golang-dev
https://golang.org/cl/6849057
---
 src/pkg/runtime/race.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/pkg/runtime/race.c b/src/pkg/runtime/race.c
index 23866f01d1..aae43852a3 100644
--- a/src/pkg/runtime/race.c
+++ b/src/pkg/runtime/race.c
@@ -34,9 +34,16 @@ static bool onstack(uintptr argp);
 void
 runtime·raceinit(void)
 {
+	uintptr sz;
+
 	m->racecall = true;
 	runtime∕race·Initialize();
-	runtime∕race·MapShadow(noptrdata, enoptrbss - noptrdata);
+	sz = (byte*)&runtime·mheap - noptrdata;
+	if(sz)
+		runtime∕race·MapShadow(noptrdata, sz);
+	sz = enoptrbss - (byte*)(&runtime·mheap+1);
+	if(sz)
+		runtime∕race·MapShadow(&runtime·mheap+1, sz);
 	m->racecall = false;
 }
 
-- 
2.48.1