cmd/link: restore windows stack commit size back to 4KB

CL 49331 increased windows stack commit size to 2MB by mistake.
Revert that change.

Fixes #22439

Change-Id: I919e549e87da326f4ba45890b4d32f6d7046186f
Reviewed-on: https://go-review.googlesource.com/74490
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

src/cmd/link/internal/ld/pe.go

@@ -848,7 +848,14 @@ func (f *peFile) writeOptionalHeader(ctxt *Link) {
 	// runtime/cgo/gcc_windows_{386,amd64}.c and the correspondent
 	// CreateThread parameter in runtime.newosproc.
 	oh64.SizeOfStackReserve = 0x00200000
-	oh64.SizeOfStackCommit = 0x00200000 - 0x2000 // account for 2 guard pages
+	if !iscgo {
+		oh64.SizeOfStackCommit = 0x00001000
+	} else {
+		// TODO(brainman): Maybe remove optional header writing altogether for cgo.
+		// For cgo it is the external linker that is building final executable.
+		// And it probably does not use any information stored in optional header.
+		oh64.SizeOfStackCommit = 0x00200000 - 0x2000 // account for 2 guard pages
+	}
 
 	// 32-bit is trickier since there much less address space to
 	// work with. Here we use large stacks only in cgo binaries as
@@ -858,7 +865,7 @@ func (f *peFile) writeOptionalHeader(ctxt *Link) {
 		oh.SizeOfStackCommit = 0x00001000
 	} else {
 		oh.SizeOfStackReserve = 0x00100000
-		oh.SizeOfStackCommit = 0x00100000 - 0x2000
+		oh.SizeOfStackCommit = 0x00100000 - 0x2000 // account for 2 guard pages
 	}
 
 	oh64.SizeOfHeapReserve = 0x00100000

src/internal/syscall/windows/mksyscall.go

@@ -4,4 +4,4 @@
 
 package windows
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go security_windows.go
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go security_windows.go psapi_windows.go

src/internal/syscall/windows/psapi_windows.go

@@ -0,0 +1,20 @@
+// Copyright 2017 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 windows
+
+type PROCESS_MEMORY_COUNTERS struct {
+	CB                         uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uintptr
+	WorkingSetSize             uintptr
+	QuotaPeakPagedPoolUsage    uintptr
+	QuotaPagedPoolUsage        uintptr
+	QuotaPeakNonPagedPoolUsage uintptr
+	QuotaNonPagedPoolUsage     uintptr
+	PagefileUsage              uintptr
+	PeakPagefileUsage          uintptr
+}
+
+//sys	GetProcessMemoryInfo(handle syscall.Handle, memCounters *PROCESS_MEMORY_COUNTERS, cb uint32) (err error) = psapi.GetProcessMemoryInfo

src/internal/syscall/windows/zsyscall_windows.go

@@ -40,6 +40,7 @@ var (
 	modkernel32 = syscall.NewLazyDLL(sysdll.Add("kernel32.dll"))
 	modnetapi32 = syscall.NewLazyDLL(sysdll.Add("netapi32.dll"))
 	modadvapi32 = syscall.NewLazyDLL(sysdll.Add("advapi32.dll"))
+	modpsapi    = syscall.NewLazyDLL(sysdll.Add("psapi.dll"))
 
 	procGetAdaptersAddresses      = modiphlpapi.NewProc("GetAdaptersAddresses")
 	procGetComputerNameExW        = modkernel32.NewProc("GetComputerNameExW")
@@ -57,6 +58,7 @@ var (
 	procOpenThreadToken           = modadvapi32.NewProc("OpenThreadToken")
 	procLookupPrivilegeValueW     = modadvapi32.NewProc("LookupPrivilegeValueW")
 	procAdjustTokenPrivileges     = modadvapi32.NewProc("AdjustTokenPrivileges")
+	procGetProcessMemoryInfo      = modpsapi.NewProc("GetProcessMemoryInfo")
 )
 
 func GetAdaptersAddresses(family uint32, flags uint32, reserved uintptr, adapterAddresses *IpAdapterAddresses, sizePointer *uint32) (errcode error) {
@@ -243,3 +245,15 @@ func adjustTokenPrivileges(token syscall.Token, disableAllPrivileges bool, newst
 	}
 	return
 }
+
+func GetProcessMemoryInfo(handle syscall.Handle, memCounters *PROCESS_MEMORY_COUNTERS, cb uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetProcessMemoryInfo.Addr(), 3, uintptr(handle), uintptr(unsafe.Pointer(memCounters)), uintptr(cb))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}

src/runtime/crash_cgo_test.go

@@ -13,6 +13,7 @@ import (
 	"os"
 	"os/exec"
 	"runtime"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -452,3 +453,20 @@ func TestCgoLockOSThreadExit(t *testing.T) {
 	t.Parallel()
 	testLockOSThreadExit(t, "testprogcgo")
 }
+
+func testWindowsStackMemory(t *testing.T, o string) {
+	stackUsage, err := strconv.Atoi(o)
+	if err != nil {
+		t.Fatalf("Failed to read stack usage: %v", err)
+	}
+	if expected, got := 100<<10, stackUsage; got > expected {
+		t.Fatalf("expected < %d bytes of memory per thread, got %d", expected, got)
+	}
+}
+
+func TestWindowsStackMemoryCgo(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows specific test")
+	}
+	testWindowsStackMemory(t, runTestProg(t, "testprogcgo", "StackMemory"))
+}

src/runtime/syscall_windows_test.go

@@ -537,6 +537,10 @@ func TestWERDialogue(t *testing.T) {
 	cmd.CombinedOutput()
 }
 
+func TestWindowsStackMemory(t *testing.T) {
+	testWindowsStackMemory(t, runTestProg(t, "testprog", "StackMemory"))
+}
+
 var used byte
 
 func use(buf []byte) {

src/runtime/testdata/testprog/syscall_windows.go

@@ -4,11 +4,18 @@
 
 package main
 
-import "syscall"
+import (
+	"internal/syscall/windows"
+	"runtime"
+	"sync"
+	"syscall"
+	"unsafe"
+)
 
 func init() {
 	register("RaiseException", RaiseException)
 	register("ZeroDivisionException", ZeroDivisionException)
+	register("StackMemory", StackMemory)
 }
 
 func RaiseException() {
@@ -25,3 +32,39 @@ func ZeroDivisionException() {
 	z := x / y
 	println(z)
 }
+
+func getPagefileUsage() (uintptr, error) {
+	p, err := syscall.GetCurrentProcess()
+	if err != nil {
+		return 0, err
+	}
+	var m windows.PROCESS_MEMORY_COUNTERS
+	err = windows.GetProcessMemoryInfo(p, &m, uint32(unsafe.Sizeof(m)))
+	if err != nil {
+		return 0, err
+	}
+	return m.PagefileUsage, nil
+}
+
+func StackMemory() {
+	mem1, err := getPagefileUsage()
+	if err != nil {
+		panic(err)
+	}
+	const threadCount = 100
+	var wg sync.WaitGroup
+	for i := 0; i < threadCount; i++ {
+		wg.Add(1)
+		go func() {
+			runtime.LockOSThread()
+			wg.Done()
+			select {}
+		}()
+	}
+	wg.Wait()
+	mem2, err := getPagefileUsage()
+	if err != nil {
+		panic(err)
+	}
+	print((mem2 - mem1) / threadCount)
+}

src/runtime/testdata/testprogcgo/stack_windows.go

@@ -0,0 +1,54 @@
+// Copyright 2015 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 main
+
+import "C"
+import (
+	"internal/syscall/windows"
+	"runtime"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+func init() {
+	register("StackMemory", StackMemory)
+}
+
+func getPagefileUsage() (uintptr, error) {
+	p, err := syscall.GetCurrentProcess()
+	if err != nil {
+		return 0, err
+	}
+	var m windows.PROCESS_MEMORY_COUNTERS
+	err = windows.GetProcessMemoryInfo(p, &m, uint32(unsafe.Sizeof(m)))
+	if err != nil {
+		return 0, err
+	}
+	return m.PagefileUsage, nil
+}
+
+func StackMemory() {
+	mem1, err := getPagefileUsage()
+	if err != nil {
+		panic(err)
+	}
+	const threadCount = 100
+	var wg sync.WaitGroup
+	for i := 0; i < threadCount; i++ {
+		wg.Add(1)
+		go func() {
+			runtime.LockOSThread()
+			wg.Done()
+			select {}
+		}()
+	}
+	wg.Wait()
+	mem2, err := getPagefileUsage()
+	if err != nil {
+		panic(err)
+	}
+	print((mem2 - mem1) / threadCount)
+}