From 28f9a2862642b0fcba08ec2e79a17c36518792ba Mon Sep 17 00:00:00 2001
From: Nikolay Sivko <n.sivko@gmail.com>
Date: Sun, 2 Nov 2014 10:17:50 +0300
Subject: [PATCH] [linux] fill SwapMemoryStat.Sin/Sout from /proc/vmstat

---
 mem_linux.go | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/mem_linux.go b/mem_linux.go
index 2cb8911..fa113ba 100644
--- a/mem_linux.go
+++ b/mem_linux.go
@@ -65,6 +65,26 @@ func SwapMemory() (*SwapMemoryStat, error) {
 	} else {
 		ret.UsedPercent = 0
 	}
-
+	lines, _ := readLines("/proc/vmstat")
+	for _, l := range lines {
+		fields := strings.Fields(l)
+		if len(fields) < 2 {
+			continue
+		}
+		switch fields[0] {
+		case "pswpin":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.Sin = value * 4 * 1024
+		case "pswpout":
+			value, err := strconv.ParseUint(fields[1], 10, 64)
+			if err != nil {
+				continue
+			}
+			ret.Sout = value * 4 * 1024
+		}
+	}
 	return ret, nil
 }