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--- wiki:scripts_and_tools [2012/04/30 18:07] – sfz to hydrogen emrum
+++ wiki:scripts_and_tools [2012/05/09 23:54] – save and restore irq process priorities emrum
@@ Line 397: / Line 397: @@
   * ardour3 + video patch
+\\
 \\
+==== save and restore irq process priorities ====
 \\
+<code bash>
+#!/bin/bash
+#
+# rtirq_power: save and restore irq process priorities
+#
+# This script is called when a change in power status happens, when
+# suspending it saves a list of all irq process priorities, when
+# resuming it changes the priorities of the proper irq processes
+# to the saved values
+#
+# Copyright (c) 2012 Fernando Lopez-Lezcano
+#
+#   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.
+. "${PM_FUNCTIONS}"
+case $1 in
+    hibernate|suspend)
+	/bin/ps -eo rtprio=,comm= --sort -rtprio | /bin/egrep ' irq/[0-9]*' | savestate rtirq
+        ;;
+    thaw|resume)
+	restorestate rtirq | while read IRQPRIO IRQCOMM ; do
+	    if [ -n "${IRQPRIO}" -a -n "${IRQCOMM}" ] ; then
+		IRQPID=`/bin/ps -e -o pid,comm | grep " ${IRQCOMM}" | awk '{print $1}'`
+		if [ -n "${IRQPID}" ] ; then
+		    PRIO=`/bin/ps -p ${IRQPID} -o rtprio=`
+		    if [ ${PRIO} -ne ${IRQPRIO} ] ; then
+			/usr/bin/chrt -f -p ${IRQPRIO} ${IRQPID}
+		    fi
+		fi
+	    fi
+	done
+        ;;
+    *) exit $NA
+        ;;
+esac
+</code>
+\\
+<quote>
+A first try at using a pm-utils script. This script saves the priority state of all irq* processes and restores them after a resume. It only restores the priority for processes that still exist after the resume, and will do nothing for new processes (ie: you plugin a usb card while the computer is sleeping). That would be taken care by my previously posted udev script which would change priority of newly inserted soundcards. I put 05rtirq it in /etc/pm/sleep.d/ directory... it seems to be working fine in my laptop.
+</quote>
+\\
+\\
+\\
+\\