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Code

ctdb-daemon: Make sure ctdb runs with real-time priority

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Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This commit is contained in:
Amitay Isaacs 2014-09-12 11:22:36 +10:00 committed by Amitay Isaacs
parent 7ae7a9c463
commit d410b20601
4 changed files with 16 additions and 7 deletions
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11
ctdb/common/system_util.c
View File

@ -37,7 +37,7 @@
/*
if possible, make this task real time
*/
void set_scheduler(void)
bool set_scheduler(void)
{
#ifdef _AIX_
#if HAVE_THREAD_SETSCHED
@ -47,14 +47,15 @@ void set_scheduler(void)
ti = 0ULL;
if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
return;
return false;
}
if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
strerror(errno)));
return false;
} else {
DEBUG(DEBUG_NOTICE, ("Set scheduler to SCHED_RR\n"));
return true;
}
#endif
#else /* no AIX */
@ -70,11 +71,13 @@ void set_scheduler(void)
if (sched_setscheduler(0, policy, &p) == -1) {
DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
strerror(errno)));
return false;
} else {
DEBUG(DEBUG_NOTICE,("Set scheduler to SCHED_FIFO\n"));
return true;
}
#endif
#endif
return false;
}
/*

2
ctdb/include/ctdb_private.h
View File

@ -1090,7 +1090,7 @@ void ctdb_call_resend_all(struct ctdb_context *ctdb);
void ctdb_node_dead(struct ctdb_node *node);
void ctdb_node_connected(struct ctdb_node *node);
bool ctdb_blocking_freeze(struct ctdb_context *ctdb);
void set_scheduler(void);
bool set_scheduler(void);
void reset_scheduler(void);
struct tevent_signal *ctdb_init_sigchld(struct ctdb_context *ctdb);

5
ctdb/server/ctdb_daemon.c
View File

@ -1183,7 +1183,10 @@ int ctdb_start_daemon(struct ctdb_context *ctdb, bool do_fork, bool use_syslog)
if (ctdb->do_setsched) {
/* try to set us up as realtime */
set_scheduler();
if (!set_scheduler()) {
exit(1);
}
DEBUG(DEBUG_NOTICE, ("Set real-time scheduler priority\n"));
}
/* ensure the socket is deleted on exit of the daemon */

5
ctdb/server/ctdb_lock_helper.c
View File

@ -123,7 +123,10 @@ int main(int argc, char *argv[])
exit(1);
}
set_scheduler();
if (!set_scheduler()) {
fprintf(stderr, "%s: Unable to set real-time scheduler priority\n",
progname);
}
log_fd = atoi(argv[1]);
close(STDOUT_FILENO);