diff --git a/poky/scripts/pybootchartgui/pybootchartgui/samples.py b/poky/scripts/pybootchartgui/pybootchartgui/samples.py
index 9fc309b..472dc27 100644
--- a/poky/scripts/pybootchartgui/pybootchartgui/samples.py
+++ b/poky/scripts/pybootchartgui/pybootchartgui/samples.py
@@ -37,6 +37,23 @@
         return str(self.time) + "\t" + str(self.user) + "\t" + \
                str(self.sys) + "\t" + str(self.io) + "\t" + str (self.swap)
 
+class CPUPressureSample:
+    def __init__(self, time, avg10, avg60, avg300, deltaTotal):
+        self.time = time
+        self.avg10 = avg10
+        self.avg60 = avg60
+        self.avg300 = avg300
+        self.deltaTotal = deltaTotal
+
+class IOPressureSample:
+    def __init__(self, time, avg10, avg60, avg300, deltaTotal):
+        self.time = time
+        self.avg10 = avg10
+        self.avg60 = avg60
+        self.avg300 = avg300
+        self.deltaTotal = deltaTotal
+
+
 class MemSample:
     used_values = ('MemTotal', 'MemFree', 'Buffers', 'Cached', 'SwapTotal', 'SwapFree',)