diff --git a/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph/0001-sleepgraph-add-support-for-RT-kernel-ftrace-flags.patch b/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph/0001-sleepgraph-add-support-for-RT-kernel-ftrace-flags.patch
new file mode 100644
index 0000000..f7f8bc0
--- /dev/null
+++ b/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph/0001-sleepgraph-add-support-for-RT-kernel-ftrace-flags.patch
@@ -0,0 +1,42 @@
+From 47a1db21f6c5d17c94c58c3fe0dcce35c623dbf4 Mon Sep 17 00:00:00 2001
+From: Liwei Song <liwei.song@windriver.com>
+Date: Tue, 23 Jun 2020 04:47:20 +0000
+Subject: [PATCH] sleepgraph: add support for RT kernel ftrace flags
+
+with PREEMPT_RT enabled in kernel, ftrace have a different
+flags format:
+
+                   _-----=> irqs-off
+                  / _----=> need-resched
+                 | / _----=> need-resched
+                 || / _---=> hardirq/softirq
+                 ||| / _--=> preempt-depth
+                 ||||/     delay
+TASK-PID   CPU#  |||||   TIMESTAMP  FUNCTION
+   | |       |   |||||      |         |
+
+add support for this.
+
+Upstream-Status: Submitted [https://github.com/intel/pm-graph/pull/18]
+
+Signed-off-by: Liwei Song <liwei.song@windriver.com>
+---
+ sleepgraph.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sleepgraph.py b/sleepgraph.py
+index cfed8e09e0e6..561f165cf9be 100755
+--- a/sleepgraph.py
++++ b/sleepgraph.py
+@@ -2689,7 +2689,7 @@ class TestProps:
+ 		'[ +!#\*@$]*(?P<dur>[0-9\.]*) .*\|  (?P<msg>.*)'
+ 	ftrace_line_fmt_nop = \
+ 		' *(?P<proc>.*)-(?P<pid>[0-9]*) *\[(?P<cpu>[0-9]*)\] *'+\
+-		'(?P<flags>.{4}) *(?P<time>[0-9\.]*): *'+\
++		'(?P<flags>.{4,7}) *(?P<time>[0-9\.]*): *'+\
+ 		'(?P<msg>.*)'
+ 	def __init__(self):
+ 		self.stamp = ''
+-- 
+2.24.1
+
diff --git a/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph_5.5.bb b/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph_5.5.bb
index a137886..4526eee 100644
--- a/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph_5.5.bb
+++ b/meta-openembedded/meta-oe/recipes-kernel/pm-graph/pm-graph_5.5.bb
@@ -9,6 +9,7 @@
 SRC_URI = "git://github.com/intel/pm-graph.git \
            file://0001-Makefile-fix-multilib-build-failure.patch \
            file://0001-sleepgraph.py-use-python3.patch \
+           file://0001-sleepgraph-add-support-for-RT-kernel-ftrace-flags.patch \
 "
 S = "${WORKDIR}/git"