diff options
| -rw-r--r-- | man/systemd.conf.xml | 24 | ||||
| -rw-r--r-- | src/core/main.c | 6 | ||||
| -rw-r--r-- | src/core/system.conf | 1 |
3 files changed, 31 insertions, 0 deletions
diff --git a/man/systemd.conf.xml b/man/systemd.conf.xml index 2659f9ab7b..92942f1a93 100644 --- a/man/systemd.conf.xml +++ b/man/systemd.conf.xml @@ -216,6 +216,30 @@ </varlistentry> <varlistentry> + <term><varname>TimerSlackNSec=</varname></term> + + <listitem><para>Sets the timer slack + in nanoseconds for PID 1 which is then + inherited to all executed processes, + unless overriden individually, for + example with the + <varname>TimerSlackNSec=</varname> + setting in service units (for details + see + <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The + timer slack controls the accuracy of + wake-ups triggered by timers. See + <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry> + for more information. Note that in + contrast to most other time span + definitions this parameter takes an + integer value in nano-seconds if no + unit is specified. The usual time + units are understood + too.</para></listitem> + </varlistentry> + + <varlistentry> <term><varname>DefaultLimitCPU=</varname></term> <term><varname>DefaultLimitFSIZE=</varname></term> <term><varname>DefaultLimitDATA=</varname></term> diff --git a/src/core/main.c b/src/core/main.c index 4c3ee7d5a2..5cd012e957 100644 --- a/src/core/main.c +++ b/src/core/main.c @@ -90,6 +90,7 @@ static usec_t arg_runtime_watchdog = 0; static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE; static struct rlimit *arg_default_rlimit[RLIMIT_NLIMITS] = {}; static uint64_t arg_capability_bounding_set_drop = 0; +static nsec_t arg_timer_slack_nsec = (nsec_t) -1; static FILE* serialization = NULL; @@ -681,6 +682,7 @@ static int parse_config_file(void) { { "Manager", "RuntimeWatchdogSec", config_parse_usec, 0, &arg_runtime_watchdog }, { "Manager", "ShutdownWatchdogSec", config_parse_usec, 0, &arg_shutdown_watchdog }, { "Manager", "CapabilityBoundingSet", config_parse_bounding_set, 0, &arg_capability_bounding_set_drop }, + { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec }, { "Manager", "DefaultLimitCPU", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CPU]}, { "Manager", "DefaultLimitFSIZE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_FSIZE]}, { "Manager", "DefaultLimitDATA", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_DATA]}, @@ -1487,6 +1489,10 @@ int main(int argc, char *argv[]) { if (arg_running_as == MANAGER_SYSTEM && arg_runtime_watchdog > 0) watchdog_set_timeout(&arg_runtime_watchdog); + if (arg_timer_slack_nsec != (nsec_t) -1) + if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0) + log_error("Failed to adjust timer slack: %m"); + if (arg_capability_bounding_set_drop) { r = capability_bounding_set_drop(arg_capability_bounding_set_drop, true); if (r < 0) { diff --git a/src/core/system.conf b/src/core/system.conf index 7b9171b803..c6ba95c212 100644 --- a/src/core/system.conf +++ b/src/core/system.conf @@ -25,6 +25,7 @@ #RuntimeWatchdogSec=0 #ShutdownWatchdogSec=10min #CapabilityBoundingSet= +#TimerSlackNSec= #DefaultLimitCPU= #DefaultLimitFSIZE= #DefaultLimitDATA= |