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home:michael_meeks:fastboot
util-linux
hwclock-raiseprio.diff
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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);
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