DWS/chrony
1
0
Fork 0
mirror of https://gitlab.com/chrony/chrony.git synced 2025-12-03 17:35:06 -05:00
Code Issues Packages Projects Releases Wiki Activity

Add mlockall and SCHED_FIFO support

Browse Source 
The attached patch adds support for mlockall() as well as the SCHED_FIFO
real-time scheduler. It should result in reduced (and more consistent)
latency. Usage is documented in all the documents.
This commit is contained in:
John Hasler
2009-02-10 17:59:57 +01:00
committed by Miroslav Lichvar
parent cdc22df903
commit 35e662d810
11 changed files with 258 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
main.c
View File

@@ -25,6 +25,16 @@
=======================================================================
2009-1-28 John G. Hasler <jhasler@debian.org>
Added real-time support (Linux only) using sched_setscheduler() and
mlockall(). Files affected: main.c, conf.c, sys.c, sys_linux.c,
conf.h, configure, chronyd.8, chrony.texi, and
examples/chrony.conf.example. The changes are licensed under
version 2 of the GPL as described above.
=======================================================================
The main program
*/
@@ -211,6 +221,10 @@ int main
int do_init_rtc = 0;
int other_pid;
#if defined(HAVE_SCHED_SETSCHEDULER)
int return_value = 0;
#endif
LOG_Initialise();
/* Parse command line options */
@@ -219,6 +233,24 @@ int main
if (!strcmp("-f", *argv)) {
++argv, --argc;
conf_file = *argv;
#if defined(HAVE_SCHED_SETSCHEDULER)
/* Get real-time scheduler priority */
} else if (!strcmp("-P", *argv)) {
++argv, --argc;
return_value = sscanf(*argv, "%d", &SchedPriority);
if (return_value != 1 || SchedPriority < 1 || SchedPriority > 99) {
SchedPriority = 0;
LOG(LOGS_WARN, LOGF_Main, "Bad scheduler priority: [%s]", *argv);
}
#endif /* HAVE_SCHED_SETCHEDULER */
#if defined(HAVE_MLOCKALL)
/* Detect lockall switch */
} else if (!strcmp("-m", *argv)) {
LockAll = 1;
#endif /* HAVE_MLOCKALL */
} else if (!strcmp("-r", *argv)) {
reload = 1;
} else if (!strcmp("-u", *argv)) {
@@ -307,6 +339,18 @@ int main
signal(SIGHUP, signal_cleanup);
#endif /* WINNT */
#if defined(HAVE_SCHED_SETSCHEDULER)
if (SchedPriority > 0) {
SYS_SetScheduler(SchedPriority);
}
#endif
#if defined(HAVE_MLOCKALL)
if (LockAll == 1 ) {
SYS_MemLockAll(LockAll);
}
#endif
/* The program normally runs under control of the main loop in
the scheduler. */
SCH_MainLoop();