utils: added pmqos-static script for debug purposes

resolves: rhbz#1015676

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>

Makefile

@@ -15,7 +15,7 @@ archive: clean
 
 	cp tuned.py tuned.spec tuned.service tuned.tmpfiles Makefile tuned-adm.py \
 		tuned.bash dbus.conf recommend.conf tuned-main.conf $(VERSIONED_NAME)
-	cp -a doc experiments man profiles systemtap tuned $(VERSIONED_NAME)
+	cp -a doc experiments libexec man profiles systemtap tuned $(VERSIONED_NAME)
 
 	tar cjf $(VERSIONED_NAME).tar.bz2 $(VERSIONED_NAME)
 
@@ -94,6 +94,12 @@ install:
 	cp -a doc/* $(DESTDIR)/usr/share/doc/$(VERSIONED_NAME)
 	cp AUTHORS COPYING README $(DESTDIR)/usr/share/doc/$(VERSIONED_NAME)
 
+	# Install libexec scripts
+	install -m 0755 -Dd $(DESTDIR)/usr/libexec/tuned
+	for file in libexec/*; do \
+		install -m 0755 $$file $(DESTDIR)/usr/libexec/tuned; \
+	done
+
 clean:
 	find -name "*.pyc" | xargs rm -f
 	rm -rf $(VERSIONED_NAME) rpm-build-dir

libexec/pmqos-static.py

@@ -0,0 +1,158 @@
+#!/usr/bin/python
+#
+# pmqos-static.py: Simple daemon for setting static PM QoS values. It is a part
+#                  of 'tuned' and it should not be called manually.
+#
+# Copyright (C) 2011 Red Hat, Inc.
+# Authors: Jan Vcelak <jvcelak@redhat.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+
+import os
+import signal
+import struct
+import sys
+import time
+
+# Used interface is described in Linux kernel documentation:
+# Documentation/power/pm_qos_interface.txt
+
+ALLOWED_INTERFACES = [ "cpu_dma_latency", "network_latency", "network_throughput" ]
+PIDFILE = "/var/run/tuned/pmqos-static.pid"
+
+def do_fork():
+	pid = os.fork()
+	if pid > 0:
+		sys.exit(0)
+
+def close_fds():
+	s_in = file('/dev/null', 'r')
+	s_out = file('/dev/null', 'a+')
+	s_err = file('/dev/null', 'a+', 0)
+	os.dup2(s_in.fileno(), sys.stdin.fileno())
+	os.dup2(s_out.fileno(), sys.stdout.fileno())
+	os.dup2(s_err.fileno(), sys.stderr.fileno())
+
+def write_pidfile():
+	f = os.open(PIDFILE, os.O_CREAT | os.O_TRUNC | os.O_WRONLY, 0644)
+	os.write(f, "%d" % os.getpid())
+	os.close(f)
+
+def daemonize():
+	do_fork()
+	os.chdir("/")
+	os.setsid()
+	os.umask(0)
+	do_fork()
+	close_fds()
+
+def set_pmqos(name, value):
+	filename = "/dev/%s" % name
+	bin_value = struct.pack("i", int(value))
+	fd = os.open(filename, os.O_WRONLY)
+	os.write(fd, bin_value)
+	return fd
+
+def sleep_forever():
+	while True:
+		time.sleep(86400)
+
+def sigterm_handler(signum, frame):
+	global pmqos_fds
+	if type(pmqos_fds) is list:
+		for fd in pmqos_fds:
+			os.close(fd)
+	sys.exit(0)
+
+def run_daemon(options):
+	try:
+		daemonize()
+		write_pidfile()
+		signal.signal(signal.SIGTERM, sigterm_handler)
+	except Exception, e:
+		print >>sys.stderr, "Cannot daemonize (%s)." % e
+		return False
+
+	global pmqos_fds
+	pmqos_fds = []
+
+	for (name, value) in options.items():
+		try:
+			new_fd = set_pmqos(name, value)
+			pmqos_fds.append(new_fd)
+		except:
+			# we are daemonized
+			pass
+
+	if len(pmqos_fds) > 0:
+		sleep_forever()
+	else:
+		return False
+
+def kill_daemon(force = False):
+	try:
+		with open(PIDFILE, "r") as pidfile:
+			daemon_pid = int(pidfile.read())
+	except IOError, e:
+		if not force: print >>sys.stderr, "Cannot open PID file (%s)." % e
+		return False
+
+	try:
+		os.kill(daemon_pid, signal.SIGTERM)
+	except OSError, e:
+		if not force: print >>sys.stderr, "Cannot terminate the daemon (%s)." % e
+		return False
+
+	try:
+		os.unlink(PIDFILE)
+	except OSError, e:
+		if not force: print >>sys.stderr, "Cannot delete the PID file (%s)." % e
+		return False
+
+	return True
+
+if __name__ == "__main__":
+
+	disable = False
+	options = {}
+
+	for option in sys.argv[1:]:
+		if option == "disable":
+			disable = True
+			break
+
+		try:
+			(name, value) = option.split("=")
+		except ValueError:
+			name = option
+			value = None
+
+		if name in ALLOWED_INTERFACES and len(value) > 0:
+			options[name] = value
+		else:
+			print >>sys.stderr, "Invalid option (%s)." % option
+
+
+	if disable:
+		sys.exit(0 if kill_daemon() else 1)
+
+	if len(options) == 0:
+		print >>sys.stderr, "No options set. Not starting."
+		sys.exit(1)
+
+	kill_daemon(True)
+	run_daemon(options)
+	sys.exit(1)

tuned.spec

@@ -26,8 +26,8 @@ Summary: Various tuned utilities
 Requires: powertop
 
 %description utils
-This package contains utilities that can help you to fine tune your
-system and manage tuned profiles.
+This package contains utilities that can help you to fine tune and
+debug your system and manage tuned profiles.
 
 %package utils-systemtap
 Summary: Disk and net statistic monitoring systemtap scripts
@@ -124,6 +124,7 @@ sed -i 's|.*/\([^/]\+\)/[^\.]\+\.conf|\1|' /etc/tuned/active_profile
 %defattr(-,root,root,-)
 %doc COPYING
 %{_bindir}/powertop2tuned
+%{_libexecdir}/tuned/
 
 %files utils-systemtap
 %defattr(-,root,root,-)