1 files changed, 35 insertions, 0 deletions
diff --git a/src/runtime/pprof/pprof_rusage.go b/src/runtime/pprof/pprof_rusage.go
new file mode 100644
index 0000000..aa429fb
--- /dev/null
+++ b/src/runtime/pprof/pprof_rusage.go
@@ -0,0 +1,35 @@
+// Copyright 2019 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.
+
+//go:build unix
+
+package pprof
+
+import (
+	"fmt"
+	"io"
+	"runtime"
+	"syscall"
+)
+
+// Adds MaxRSS to platforms that are supported.
+func addMaxRSS(w io.Writer) {
+	var rssToBytes uintptr
+	switch runtime.GOOS {
+	case "aix", "android", "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
+		rssToBytes = 1024
+	case "darwin", "ios":
+		rssToBytes = 1
+	case "illumos", "solaris":
+		rssToBytes = uintptr(syscall.Getpagesize())
+	default:
+		panic("unsupported OS")
+	}
+
+	var rusage syscall.Rusage
+	err := syscall.Getrusage(syscall.RUSAGE_SELF, &rusage)
+	if err == nil {
+		fmt.Fprintf(w, "# MaxRSS = %d\n", uintptr(rusage.Maxrss)*rssToBytes)
+	}
+}