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diff --git a/tools/perf/scripts/python/call-graph-from-sql.py b/tools/perf/scripts/python/call-graph-from-sql.py
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+++ b/tools/perf/scripts/python/call-graph-from-sql.py
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+#!/usr/bin/python2
+# call-graph-from-sql.py: create call-graph from sql database
+# Copyright (c) 2014-2017, Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+
+# To use this script you will need to have exported data using either the
+# export-to-sqlite.py or the export-to-postgresql.py script.  Refer to those
+# scripts for details.
+#
+# Following on from the example in the export scripts, a
+# call-graph can be displayed for the pt_example database like this:
+#
+#       python tools/perf/scripts/python/call-graph-from-sql.py pt_example
+#
+# Note that for PostgreSQL, this script supports connecting to remote databases
+# by setting hostname, port, username, password, and dbname e.g.
+#
+#       python tools/perf/scripts/python/call-graph-from-sql.py "hostname=myhost username=myuser password=mypassword dbname=pt_example"
+#
+# The result is a GUI window with a tree representing a context-sensitive
+# call-graph.  Expanding a couple of levels of the tree and adjusting column
+# widths to suit will display something like:
+#
+#                                         Call Graph: pt_example
+# Call Path                          Object      Count   Time(ns)  Time(%)  Branch Count   Branch Count(%)
+# v- ls
+#     v- 2638:2638
+#         v- _start                  ld-2.19.so    1     10074071   100.0         211135            100.0
+#           |- unknown               unknown       1        13198     0.1              1              0.0
+#           >- _dl_start             ld-2.19.so    1      1400980    13.9          19637              9.3
+#           >- _d_linit_internal     ld-2.19.so    1       448152     4.4          11094              5.3
+#           v-__libc_start_main@plt  ls            1      8211741    81.5         180397             85.4
+#              >- _dl_fixup          ld-2.19.so    1         7607     0.1            108              0.1
+#              >- __cxa_atexit       libc-2.19.so  1        11737     0.1             10              0.0
+#              >- __libc_csu_init    ls            1        10354     0.1             10              0.0
+#              |- _setjmp            libc-2.19.so  1            0     0.0              4              0.0
+#              v- main               ls            1      8182043    99.6         180254             99.9
+#
+# Points to note:
+#       The top level is a command name (comm)
+#       The next level is a thread (pid:tid)
+#       Subsequent levels are functions
+#       'Count' is the number of calls
+#       'Time' is the elapsed time until the function returns
+#       Percentages are relative to the level above
+#       'Branch Count' is the total number of branches for that function and all
+#       functions that it calls
+
+import sys
+from PySide.QtCore import *
+from PySide.QtGui import *
+from PySide.QtSql import *
+from decimal import *
+
+class TreeItem():
+
+        def __init__(self, db, row, parent_item):
+                self.db = db
+                self.row = row
+                self.parent_item = parent_item
+                self.query_done = False;
+                self.child_count = 0
+                self.child_items = []
+                self.data = ["", "", "", "", "", "", ""]
+                self.comm_id = 0
+                self.thread_id = 0
+                self.call_path_id = 1
+                self.branch_count = 0
+                self.time = 0
+                if not parent_item:
+                        self.setUpRoot()
+
+        def setUpRoot(self):
+                self.query_done = True
+                query = QSqlQuery(self.db)
+                ret = query.exec_('SELECT id, comm FROM comms')
+                if not ret:
+                        raise Exception("Query failed: " + query.lastError().text())
+                while query.next():
+                        if not query.value(0):
+                                continue
+                        child_item = TreeItem(self.db, self.child_count, self)
+                        self.child_items.append(child_item)
+                        self.child_count += 1
+                        child_item.setUpLevel1(query.value(0), query.value(1))
+
+        def setUpLevel1(self, comm_id, comm):
+                self.query_done = True;
+                self.comm_id = comm_id
+                self.data[0] = comm
+                self.child_items = []
+                self.child_count = 0
+                query = QSqlQuery(self.db)
+                ret = query.exec_('SELECT thread_id, ( SELECT pid FROM threads WHERE id = thread_id ), ( SELECT tid FROM threads WHERE id = thread_id ) FROM comm_threads WHERE comm_id = ' + str(comm_id))
+                if not ret:
+                        raise Exception("Query failed: " + query.lastError().text())
+                while query.next():
+                        child_item = TreeItem(self.db, self.child_count, self)
+                        self.child_items.append(child_item)
+                        self.child_count += 1
+                        child_item.setUpLevel2(comm_id, query.value(0), query.value(1), query.value(2))
+
+        def setUpLevel2(self, comm_id, thread_id, pid, tid):
+                self.comm_id = comm_id
+                self.thread_id = thread_id
+                self.data[0] = str(pid) + ":" + str(tid)
+
+        def getChildItem(self, row):
+                return self.child_items[row]
+
+        def getParentItem(self):
+                return self.parent_item
+
+        def getRow(self):
+                return self.row
+
+        def timePercent(self, b):
+                if not self.time:
+                        return "0.0"
+                x = (b * Decimal(100)) / self.time
+                return str(x.quantize(Decimal('.1'), rounding=ROUND_HALF_UP))
+
+        def branchPercent(self, b):
+                if not self.branch_count:
+                        return "0.0"
+                x = (b * Decimal(100)) / self.branch_count
+                return str(x.quantize(Decimal('.1'), rounding=ROUND_HALF_UP))
+
+        def addChild(self, call_path_id, name, dso, count, time, branch_count):
+                child_item = TreeItem(self.db, self.child_count, self)
+                child_item.comm_id = self.comm_id
+                child_item.thread_id = self.thread_id
+                child_item.call_path_id = call_path_id
+                child_item.branch_count = branch_count
+                child_item.time = time
+                child_item.data[0] = name
+                if dso == "[kernel.kallsyms]":
+                        dso = "[kernel]"
+                child_item.data[1] = dso
+                child_item.data[2] = str(count)
+                child_item.data[3] = str(time)
+                child_item.data[4] = self.timePercent(time)
+                child_item.data[5] = str(branch_count)
+                child_item.data[6] = self.branchPercent(branch_count)
+                self.child_items.append(child_item)
+                self.child_count += 1
+
+        def selectCalls(self):
+                self.query_done = True;
+                query = QSqlQuery(self.db)
+                ret = query.exec_('SELECT id, call_path_id, branch_count, call_time, return_time, '
+                                  '( SELECT name FROM symbols WHERE id = ( SELECT symbol_id FROM call_paths WHERE id = call_path_id ) ), '
+                                  '( SELECT short_name FROM dsos WHERE id = ( SELECT dso_id FROM symbols WHERE id = ( SELECT symbol_id FROM call_paths WHERE id = call_path_id ) ) ), '
+                                  '( SELECT ip FROM call_paths where id = call_path_id ) '
+                                  'FROM calls WHERE parent_call_path_id = ' + str(self.call_path_id) + ' AND comm_id = ' + str(self.comm_id) + ' AND thread_id = ' + str(self.thread_id) +
+                                  ' ORDER BY call_path_id')
+                if not ret:
+                        raise Exception("Query failed: " + query.lastError().text())
+                last_call_path_id = 0
+                name = ""
+                dso = ""
+                count = 0
+                branch_count = 0
+                total_branch_count = 0
+                time = 0
+                total_time = 0
+                while query.next():
+                        if query.value(1) == last_call_path_id:
+                                count += 1
+                                branch_count += query.value(2)
+                                time += query.value(4) - query.value(3)
+                        else:
+                                if count:
+                                        self.addChild(last_call_path_id, name, dso, count, time, branch_count)
+                                last_call_path_id = query.value(1)
+                                name = query.value(5)
+                                dso = query.value(6)
+                                count = 1
+                                total_branch_count += branch_count
+                                total_time += time
+                                branch_count = query.value(2)
+                                time = query.value(4) - query.value(3)
+                if count:
+                        self.addChild(last_call_path_id, name, dso, count, time, branch_count)
+                total_branch_count += branch_count
+                total_time += time
+                # Top level does not have time or branch count, so fix that here
+                if total_branch_count > self.branch_count:
+                        self.branch_count = total_branch_count
+                        if self.branch_count:
+                                for child_item in self.child_items:
+                                        child_item.data[6] = self.branchPercent(child_item.branch_count)
+                if total_time > self.time:
+                        self.time = total_time
+                        if self.time:
+                                for child_item in self.child_items:
+                                        child_item.data[4] = self.timePercent(child_item.time)
+
+        def childCount(self):
+                if not self.query_done:
+                        self.selectCalls()
+                return self.child_count
+
+        def columnCount(self):
+                return 7
+
+        def columnHeader(self, column):
+                headers = ["Call Path", "Object", "Count ", "Time (ns) ", "Time (%) ", "Branch Count ", "Branch Count (%) "]
+                return headers[column]
+
+        def getData(self, column):
+                return self.data[column]
+
+class TreeModel(QAbstractItemModel):
+
+        def __init__(self, db, parent=None):
+                super(TreeModel, self).__init__(parent)
+                self.db = db
+                self.root = TreeItem(db, 0, None)
+
+        def columnCount(self, parent):
+                return self.root.columnCount()
+
+        def rowCount(self, parent):
+                if parent.isValid():
+                        parent_item = parent.internalPointer()
+                else:
+                        parent_item = self.root
+                return parent_item.childCount()
+
+        def headerData(self, section, orientation, role):
+                if role == Qt.TextAlignmentRole:
+                        if section > 1:
+                                return Qt.AlignRight
+                if role != Qt.DisplayRole:
+                        return None
+                if orientation != Qt.Horizontal:
+                        return None
+                return self.root.columnHeader(section)
+
+        def parent(self, child):
+                child_item = child.internalPointer()
+                if child_item is self.root:
+                        return QModelIndex()
+                parent_item = child_item.getParentItem()
+                return self.createIndex(parent_item.getRow(), 0, parent_item)
+
+        def index(self, row, column, parent):
+                if parent.isValid():
+                        parent_item = parent.internalPointer()
+                else:
+                        parent_item = self.root
+                child_item = parent_item.getChildItem(row)
+                return self.createIndex(row, column, child_item)
+
+        def data(self, index, role):
+                if role == Qt.TextAlignmentRole:
+                        if index.column() > 1:
+                                return Qt.AlignRight
+                if role != Qt.DisplayRole:
+                        return None
+                index_item = index.internalPointer()
+                return index_item.getData(index.column())
+
+class MainWindow(QMainWindow):
+
+        def __init__(self, db, dbname, parent=None):
+                super(MainWindow, self).__init__(parent)
+
+                self.setObjectName("MainWindow")
+                self.setWindowTitle("Call Graph: " + dbname)
+                self.move(100, 100)
+                self.resize(800, 600)
+                style = self.style()
+                icon = style.standardIcon(QStyle.SP_MessageBoxInformation)
+                self.setWindowIcon(icon);
+
+                self.model = TreeModel(db)
+
+                self.view = QTreeView()
+                self.view.setModel(self.model)
+
+                self.setCentralWidget(self.view)
+
+if __name__ == '__main__':
+        if (len(sys.argv) < 2):
+                print >> sys.stderr, "Usage is: call-graph-from-sql.py <database name>"
+                raise Exception("Too few arguments")
+
+        dbname = sys.argv[1]
+
+        is_sqlite3 = False
+        try:
+                f = open(dbname)
+                if f.read(15) == "SQLite format 3":
+                        is_sqlite3 = True
+                f.close()
+        except:
+                pass
+
+        if is_sqlite3:
+                db = QSqlDatabase.addDatabase('QSQLITE')
+        else:
+                db = QSqlDatabase.addDatabase('QPSQL')
+                opts = dbname.split()
+                for opt in opts:
+                        if '=' in opt:
+                                opt = opt.split('=')
+                                if opt[0] == 'hostname':
+                                        db.setHostName(opt[1])
+                                elif opt[0] == 'port':
+                                        db.setPort(int(opt[1]))
+                                elif opt[0] == 'username':
+                                        db.setUserName(opt[1])
+                                elif opt[0] == 'password':
+                                        db.setPassword(opt[1])
+                                elif opt[0] == 'dbname':
+                                        dbname = opt[1]
+                        else:
+                                dbname = opt
+
+        db.setDatabaseName(dbname)
+        if not db.open():
+                raise Exception("Failed to open database " + dbname + " error: " + db.lastError().text())
+
+        app = QApplication(sys.argv)
+        window = MainWindow(db, dbname)
+        window.show()
+        err = app.exec_()
+        db.close()
+        sys.exit(err)