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-rw-r--r--tools/perf/scripts/python/bin/compaction-times-record2
-rw-r--r--tools/perf/scripts/python/bin/compaction-times-report4
-rw-r--r--tools/perf/scripts/python/call-graph-from-postgresql.py327
-rw-r--r--tools/perf/scripts/python/compaction-times.py311
-rw-r--r--tools/perf/scripts/python/export-to-postgresql.py47
5 files changed, 691 insertions, 0 deletions
diff --git a/tools/perf/scripts/python/bin/compaction-times-record b/tools/perf/scripts/python/bin/compaction-times-record
new file mode 100644
index 000000000..6edcd40e1
--- /dev/null
+++ b/tools/perf/scripts/python/bin/compaction-times-record
@@ -0,0 +1,2 @@
+#!/bin/bash
+perf record -e compaction:mm_compaction_begin -e compaction:mm_compaction_end -e compaction:mm_compaction_migratepages -e compaction:mm_compaction_isolate_migratepages -e compaction:mm_compaction_isolate_freepages $@
diff --git a/tools/perf/scripts/python/bin/compaction-times-report b/tools/perf/scripts/python/bin/compaction-times-report
new file mode 100644
index 000000000..3dc13897c
--- /dev/null
+++ b/tools/perf/scripts/python/bin/compaction-times-report
@@ -0,0 +1,4 @@
+#!/bin/bash
+#description: display time taken by mm compaction
+#args: [-h] [-u] [-p|-pv] [-t | [-m] [-fs] [-ms]] [pid|pid-range|comm-regex]
+perf script -s "$PERF_EXEC_PATH"/scripts/python/compaction-times.py $@
diff --git a/tools/perf/scripts/python/call-graph-from-postgresql.py b/tools/perf/scripts/python/call-graph-from-postgresql.py
new file mode 100644
index 000000000..e78fdc2a5
--- /dev/null
+++ b/tools/perf/scripts/python/call-graph-from-postgresql.py
@@ -0,0 +1,327 @@
+#!/usr/bin/python2
+# call-graph-from-postgresql.py: create call-graph from postgresql database
+# Copyright (c) 2014, 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 the
+# export-to-postgresql.py script. Refer to that script for details.
+#
+# Following on from the example in the export-to-postgresql.py script, a
+# call-graph can be displayed for the pt_example database like this:
+#
+# python tools/perf/scripts/python/call-graph-from-postgresql.py pt_example
+#
+# Note 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-postgresql.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-postgresql.py <database name>"
+ raise Exception("Too few arguments")
+
+ dbname = sys.argv[1]
+
+ 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)
diff --git a/tools/perf/scripts/python/compaction-times.py b/tools/perf/scripts/python/compaction-times.py
new file mode 100644
index 000000000..239cb0568
--- /dev/null
+++ b/tools/perf/scripts/python/compaction-times.py
@@ -0,0 +1,311 @@
+# report time spent in compaction
+# Licensed under the terms of the GNU GPL License version 2
+
+# testing:
+# 'echo 1 > /proc/sys/vm/compact_memory' to force compaction of all zones
+
+import os
+import sys
+import re
+
+import signal
+signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+
+usage = "usage: perf script report compaction-times.py -- [-h] [-u] [-p|-pv] [-t | [-m] [-fs] [-ms]] [pid|pid-range|comm-regex]\n"
+
+class popt:
+ DISP_DFL = 0
+ DISP_PROC = 1
+ DISP_PROC_VERBOSE=2
+
+class topt:
+ DISP_TIME = 0
+ DISP_MIG = 1
+ DISP_ISOLFREE = 2
+ DISP_ISOLMIG = 4
+ DISP_ALL = 7
+
+class comm_filter:
+ def __init__(self, re):
+ self.re = re
+
+ def filter(self, pid, comm):
+ m = self.re.search(comm)
+ return m == None or m.group() == ""
+
+class pid_filter:
+ def __init__(self, low, high):
+ self.low = (0 if low == "" else int(low))
+ self.high = (0 if high == "" else int(high))
+
+ def filter(self, pid, comm):
+ return not (pid >= self.low and (self.high == 0 or pid <= self.high))
+
+def set_type(t):
+ global opt_disp
+ opt_disp = (t if opt_disp == topt.DISP_ALL else opt_disp|t)
+
+def ns(sec, nsec):
+ return (sec * 1000000000) + nsec
+
+def time(ns):
+ return "%dns" % ns if opt_ns else "%dus" % (round(ns, -3) / 1000)
+
+class pair:
+ def __init__(self, aval, bval, alabel = None, blabel = None):
+ self.alabel = alabel
+ self.blabel = blabel
+ self.aval = aval
+ self.bval = bval
+
+ def __add__(self, rhs):
+ self.aval += rhs.aval
+ self.bval += rhs.bval
+ return self
+
+ def __str__(self):
+ return "%s=%d %s=%d" % (self.alabel, self.aval, self.blabel, self.bval)
+
+class cnode:
+ def __init__(self, ns):
+ self.ns = ns
+ self.migrated = pair(0, 0, "moved", "failed")
+ self.fscan = pair(0,0, "scanned", "isolated")
+ self.mscan = pair(0,0, "scanned", "isolated")
+
+ def __add__(self, rhs):
+ self.ns += rhs.ns
+ self.migrated += rhs.migrated
+ self.fscan += rhs.fscan
+ self.mscan += rhs.mscan
+ return self
+
+ def __str__(self):
+ prev = 0
+ s = "%s " % time(self.ns)
+ if (opt_disp & topt.DISP_MIG):
+ s += "migration: %s" % self.migrated
+ prev = 1
+ if (opt_disp & topt.DISP_ISOLFREE):
+ s += "%sfree_scanner: %s" % (" " if prev else "", self.fscan)
+ prev = 1
+ if (opt_disp & topt.DISP_ISOLMIG):
+ s += "%smigration_scanner: %s" % (" " if prev else "", self.mscan)
+ return s
+
+ def complete(self, secs, nsecs):
+ self.ns = ns(secs, nsecs) - self.ns
+
+ def increment(self, migrated, fscan, mscan):
+ if (migrated != None):
+ self.migrated += migrated
+ if (fscan != None):
+ self.fscan += fscan
+ if (mscan != None):
+ self.mscan += mscan
+
+
+class chead:
+ heads = {}
+ val = cnode(0);
+ fobj = None
+
+ @classmethod
+ def add_filter(cls, filter):
+ cls.fobj = filter
+
+ @classmethod
+ def create_pending(cls, pid, comm, start_secs, start_nsecs):
+ filtered = 0
+ try:
+ head = cls.heads[pid]
+ filtered = head.is_filtered()
+ except KeyError:
+ if cls.fobj != None:
+ filtered = cls.fobj.filter(pid, comm)
+ head = cls.heads[pid] = chead(comm, pid, filtered)
+
+ if not filtered:
+ head.mark_pending(start_secs, start_nsecs)
+
+ @classmethod
+ def increment_pending(cls, pid, migrated, fscan, mscan):
+ head = cls.heads[pid]
+ if not head.is_filtered():
+ if head.is_pending():
+ head.do_increment(migrated, fscan, mscan)
+ else:
+ sys.stderr.write("missing start compaction event for pid %d\n" % pid)
+
+ @classmethod
+ def complete_pending(cls, pid, secs, nsecs):
+ head = cls.heads[pid]
+ if not head.is_filtered():
+ if head.is_pending():
+ head.make_complete(secs, nsecs)
+ else:
+ sys.stderr.write("missing start compaction event for pid %d\n" % pid)
+
+ @classmethod
+ def gen(cls):
+ if opt_proc != popt.DISP_DFL:
+ for i in cls.heads:
+ yield cls.heads[i]
+
+ @classmethod
+ def str(cls):
+ return cls.val
+
+ def __init__(self, comm, pid, filtered):
+ self.comm = comm
+ self.pid = pid
+ self.val = cnode(0)
+ self.pending = None
+ self.filtered = filtered
+ self.list = []
+
+ def __add__(self, rhs):
+ self.ns += rhs.ns
+ self.val += rhs.val
+ return self
+
+ def mark_pending(self, secs, nsecs):
+ self.pending = cnode(ns(secs, nsecs))
+
+ def do_increment(self, migrated, fscan, mscan):
+ self.pending.increment(migrated, fscan, mscan)
+
+ def make_complete(self, secs, nsecs):
+ self.pending.complete(secs, nsecs)
+ chead.val += self.pending
+
+ if opt_proc != popt.DISP_DFL:
+ self.val += self.pending
+
+ if opt_proc == popt.DISP_PROC_VERBOSE:
+ self.list.append(self.pending)
+ self.pending = None
+
+ def enumerate(self):
+ if opt_proc == popt.DISP_PROC_VERBOSE and not self.is_filtered():
+ for i, pelem in enumerate(self.list):
+ sys.stdout.write("%d[%s].%d: %s\n" % (self.pid, self.comm, i+1, pelem))
+
+ def is_pending(self):
+ return self.pending != None
+
+ def is_filtered(self):
+ return self.filtered
+
+ def display(self):
+ if not self.is_filtered():
+ sys.stdout.write("%d[%s]: %s\n" % (self.pid, self.comm, self.val))
+
+
+def trace_end():
+ sys.stdout.write("total: %s\n" % chead.str())
+ for i in chead.gen():
+ i.display(),
+ i.enumerate()
+
+def compaction__mm_compaction_migratepages(event_name, context, common_cpu,
+ common_secs, common_nsecs, common_pid, common_comm,
+ common_callchain, nr_migrated, nr_failed):
+
+ chead.increment_pending(common_pid,
+ pair(nr_migrated, nr_failed), None, None)
+
+def compaction__mm_compaction_isolate_freepages(event_name, context, common_cpu,
+ common_secs, common_nsecs, common_pid, common_comm,
+ common_callchain, start_pfn, end_pfn, nr_scanned, nr_taken):
+
+ chead.increment_pending(common_pid,
+ None, pair(nr_scanned, nr_taken), None)
+
+def compaction__mm_compaction_isolate_migratepages(event_name, context, common_cpu,
+ common_secs, common_nsecs, common_pid, common_comm,
+ common_callchain, start_pfn, end_pfn, nr_scanned, nr_taken):
+
+ chead.increment_pending(common_pid,
+ None, None, pair(nr_scanned, nr_taken))
+
+def compaction__mm_compaction_end(event_name, context, common_cpu,
+ common_secs, common_nsecs, common_pid, common_comm,
+ common_callchain, zone_start, migrate_start, free_start, zone_end,
+ sync, status):
+
+ chead.complete_pending(common_pid, common_secs, common_nsecs)
+
+def compaction__mm_compaction_begin(event_name, context, common_cpu,
+ common_secs, common_nsecs, common_pid, common_comm,
+ common_callchain, zone_start, migrate_start, free_start, zone_end,
+ sync):
+
+ chead.create_pending(common_pid, common_comm, common_secs, common_nsecs)
+
+def pr_help():
+ global usage
+
+ sys.stdout.write(usage)
+ sys.stdout.write("\n")
+ sys.stdout.write("-h display this help\n")
+ sys.stdout.write("-p display by process\n")
+ sys.stdout.write("-pv display by process (verbose)\n")
+ sys.stdout.write("-t display stall times only\n")
+ sys.stdout.write("-m display stats for migration\n")
+ sys.stdout.write("-fs display stats for free scanner\n")
+ sys.stdout.write("-ms display stats for migration scanner\n")
+ sys.stdout.write("-u display results in microseconds (default nanoseconds)\n")
+
+
+comm_re = None
+pid_re = None
+pid_regex = "^(\d*)-(\d*)$|^(\d*)$"
+
+opt_proc = popt.DISP_DFL
+opt_disp = topt.DISP_ALL
+
+opt_ns = True
+
+argc = len(sys.argv) - 1
+if argc >= 1:
+ pid_re = re.compile(pid_regex)
+
+ for i, opt in enumerate(sys.argv[1:]):
+ if opt[0] == "-":
+ if opt == "-h":
+ pr_help()
+ exit(0);
+ elif opt == "-p":
+ opt_proc = popt.DISP_PROC
+ elif opt == "-pv":
+ opt_proc = popt.DISP_PROC_VERBOSE
+ elif opt == '-u':
+ opt_ns = False
+ elif opt == "-t":
+ set_type(topt.DISP_TIME)
+ elif opt == "-m":
+ set_type(topt.DISP_MIG)
+ elif opt == "-fs":
+ set_type(topt.DISP_ISOLFREE)
+ elif opt == "-ms":
+ set_type(topt.DISP_ISOLMIG)
+ else:
+ sys.exit(usage)
+
+ elif i == argc - 1:
+ m = pid_re.search(opt)
+ if m != None and m.group() != "":
+ if m.group(3) != None:
+ f = pid_filter(m.group(3), m.group(3))
+ else:
+ f = pid_filter(m.group(1), m.group(2))
+ else:
+ try:
+ comm_re=re.compile(opt)
+ except:
+ sys.stderr.write("invalid regex '%s'" % opt)
+ sys.exit(usage)
+ f = comm_filter(comm_re)
+
+ chead.add_filter(f)
diff --git a/tools/perf/scripts/python/export-to-postgresql.py b/tools/perf/scripts/python/export-to-postgresql.py
index 4cdafd880..84a32037a 100644
--- a/tools/perf/scripts/python/export-to-postgresql.py
+++ b/tools/perf/scripts/python/export-to-postgresql.py
@@ -15,6 +15,53 @@ import sys
import struct
import datetime
+# To use this script you will need to have installed package python-pyside which
+# provides LGPL-licensed Python bindings for Qt. You will also need the package
+# libqt4-sql-psql for Qt postgresql support.
+#
+# The script assumes postgresql is running on the local machine and that the
+# user has postgresql permissions to create databases. Examples of installing
+# postgresql and adding such a user are:
+#
+# fedora:
+#
+# $ sudo yum install postgresql postgresql-server python-pyside qt-postgresql
+# $ sudo su - postgres -c initdb
+# $ sudo service postgresql start
+# $ sudo su - postgres
+# $ createuser <your user id here>
+# Shall the new role be a superuser? (y/n) y
+#
+# ubuntu:
+#
+# $ sudo apt-get install postgresql
+# $ sudo su - postgres
+# $ createuser <your user id here>
+# Shall the new role be a superuser? (y/n) y
+#
+# An example of using this script with Intel PT:
+#
+# $ perf record -e intel_pt//u ls
+# $ perf script -s ~/libexec/perf-core/scripts/python/export-to-postgresql.py pt_example branches calls
+# 2015-05-29 12:49:23.464364 Creating database...
+# 2015-05-29 12:49:26.281717 Writing to intermediate files...
+# 2015-05-29 12:49:27.190383 Copying to database...
+# 2015-05-29 12:49:28.140451 Removing intermediate files...
+# 2015-05-29 12:49:28.147451 Adding primary keys
+# 2015-05-29 12:49:28.655683 Adding foreign keys
+# 2015-05-29 12:49:29.365350 Done
+#
+# To browse the database, psql can be used e.g.
+#
+# $ psql pt_example
+# pt_example=# select * from samples_view where id < 100;
+# pt_example=# \d+
+# pt_example=# \d+ samples_view
+# pt_example=# \q
+#
+# An example of using the database is provided by the script
+# call-graph-from-postgresql.py. Refer to that script for details.
+
from PySide.QtSql import *
# Need to access PostgreSQL C library directly to use COPY FROM STDIN