File hwclock-raiseprio.diff of Package util-linux

From: Kurt Garloff <garloff@suse.de>
Subject: Run hwclock with higher CPU priority
References: bnc441106

We have polling and busy waiting loops; decrease the chance of being
preempted in a bad moment by using a higher CPU priority.
(No error handling is intentional -- if it fails it fails.)

[Patch 1/4]

Index: util-linux-ng-2.14.1/hwclock/hwclock.c
===================================================================
--- util-linux-ng-2.14.1.orig/hwclock/hwclock.c
+++ util-linux-ng-2.14.1/hwclock/hwclock.c
@@ -80,8 +80,9 @@
 #include <sys/stat.h>
 #include <stdarg.h>
 #include <getopt.h>
 #include <sysexits.h>
+#include <sys/resource.h>
 
 #include "clock.h"
 #include "nls.h"
 
@@ -1253,8 +1254,15 @@ usage( const char *fmt, ... ) {
 
   hwclock_exit(fmt ? EX_USAGE : 0);
 }
 
+/* Raise priority to nice -15 level to increase accuracy */
+static void
+raise_priority()
+{
+	setpriority(PRIO_PROCESS, 0, PRIO_MIN*7/8+PRIO_MAX/8);
+}
+
 static const struct option longopts[] = {
 	{ "adjust", 0, 0, 'a' },
 	{ "help", 0, 0, 'h' },
 	{ "show", 0, 0, 'r' },
@@ -1542,8 +1550,9 @@ main(int argc, char **argv) {
 				  "of our search for an access method.\n"));
 		hwclock_exit(1);
 	}
 
+	raise_priority();
 	rc = manipulate_clock(show, adjust, noadjfile, set, set_time,
 				hctosys, systohc, startup_time, utc,
 				local_opt, testing);
 	hwclock_exit(rc);