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Allow starting a new process with the specified parameters. For example: 

# schedctl -C SCHED_FIFO top
This commit is contained in:
ad 2008-05-25 23:22:16 +00:00
parent 9d0947ae6e
commit e25a4f7edc
2 changed files with 56 additions and 29 deletions
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34
usr.sbin/schedctl/schedctl.8
View File

@ -1,4 +1,4 @@
.\" $NetBSD: schedctl.8,v 1.5 2008/04/30 13:11:02 martin Exp $
.\" $NetBSD: schedctl.8,v 1.6 2008/05/25 23:22:16 ad Exp $
.\"
.\" Copyright (c) 2008 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 28, 2008
.Dd May 26, 2008
.Dt SCHEDCTL 8
.Os
.Sh NAME
@ -35,29 +35,31 @@
.Nd control scheduling of processes and threads
.Sh SYNOPSIS
.Nm
.Fl p Ar pid
.Op Fl A Ar processors
.Op Fl A Ar cpus
.Op Fl C Ar class
.Op Fl P Ar priority
.Op Fl P Ar pri
.Op Fl t Ar lid
.Fl p Ar pid | Ar command
.Sh DESCRIPTION
The
.Nm
command can be used to control the scheduling of processes and threads.
It also returns information about current scheduling parameters
It also returns information about the current scheduling parameters
of the process or thread.
Only the super-user may change the scheduling parameters.
.Nm
can also be used to start a new command using the specified parameters.
.Pp
Available options:
.Bl -tag -width indent
.It Fl A Ar processors
.It Fl A Ar cpus
Set of the processors on which process or thread should run, that
is, affinity.
Processors are defined as numbers (starting from zero) and separated
by commas.
A value of \-1 is used to unset the affinity.
.It Fl C Ar class
Scheduling class (policy) might be:
Scheduling class (policy), one of:
.Bl -tag -width SCHEDOTHERXX
.It Dv SCHED_OTHER
Time-sharing (TS) scheduling policy.
@ -68,7 +70,7 @@ First in, first out (FIFO) scheduling policy.
.It Dv SCHED_RR
Round-robin scheduling policy.
.El
.It Fl P Ar priority
.It Fl P Ar pri
Priority which will be set for the process or thread.
For all scheduling classes, priority might be set to any value in
the range from
@ -79,9 +81,16 @@ the range from
.It Fl p Ar pid
The target process which will be affected.
If the process has more than one thread, all of them will be affected.
.Pp
If
.Fl p
is not given, a command to execute must be given on the command line.
.It Fl t Ar lid
Thread in the specified process.
If specified, only this thread in the process will be affected.
May only be specified if
.Fl p
is also given.
.El
.Sh EXAMPLES
Show scheduling information about the process whose ID is
@ -100,6 +109,13 @@ in process whose ID is
.Bd -literal -offset indent
# schedctl -p 123 -t 1 -A 0,1 -C 2 -P 63
.Ed
.Pp
Run the
.Xr top 1
command with real-time priority:
.Bd -literal -offset indent
# schedctl -C SCHED_FIFO top
.Ed
.Sh SEE ALSO
.Xr nice 1 ,
.Xr getpriority 2 ,

51
usr.sbin/schedctl/schedctl.c
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@ -1,4 +1,4 @@
/* $NetBSD: schedctl.c,v 1.6 2008/04/28 16:52:17 ad Exp $ */
/* $NetBSD: schedctl.c,v 1.7 2008/05/25 23:22:16 ad Exp $ */
/*
* Copyright (c) 2008, Mindaugas Rasiukevicius <rmind at NetBSD org>
@ -33,7 +33,7 @@
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: schedctl.c,v 1.6 2008/04/28 16:52:17 ad Exp $");
__RCSID("$NetBSD: schedctl.c,v 1.7 2008/05/25 23:22:16 ad Exp $");
#endif
#include <stdio.h>
@ -142,29 +142,39 @@ main(int argc, char **argv)
}
/* At least PID must be specified */
if (pid == 0)
usage();
if (pid == 0) {
if (argc == 1 || lid != 0)
usage();
pid = getpid();
} else {
if (argc != 1)
usage();
}
/* Set the scheduling information for thread/process */
sched_set(pid, lid, policy, set ? sp : NULL, cpuset);
/* Show information about each thread */
kd = kvm_open(NULL, NULL, NULL, KVM_NO_FILES, "kvm_open");
if (kd == NULL)
err(EXIT_FAILURE, "kvm_open");
lwp_list = kvm_getlwps(kd, pid, 0, sizeof(struct kinfo_lwp), &count);
if (lwp_list == NULL)
err(EXIT_FAILURE, "kvm_getlwps");
for (lwp = lwp_list, i = 0; i < count; lwp++, i++) {
if (lid && lid != lwp->l_lid)
continue;
thread_info(pid, lwp->l_lid);
if (pid != getpid()) {
kd = kvm_open(NULL, NULL, NULL, KVM_NO_FILES, "kvm_open");
if (kd == NULL)
err(EXIT_FAILURE, "kvm_open");
lwp_list = kvm_getlwps(kd, pid, 0, sizeof(struct kinfo_lwp), &count);
if (lwp_list == NULL)
err(EXIT_FAILURE, "kvm_getlwps");
for (lwp = lwp_list, i = 0; i < count; lwp++, i++) {
if (lid && lid != lwp->l_lid)
continue;
thread_info(pid, lwp->l_lid);
}
kvm_close(kd);
free(sp);
free(cpuset);
return 0;
}
kvm_close(kd);
free(sp);
free(cpuset);
return 0;
(void)execvp(argv[optind], argv + optind);
err(EXIT_FAILURE, "execvp");
}
static void
@ -297,7 +307,8 @@ showcpuset(cpuset_t *cpuset)
static void
usage(void)
{
fprintf(stderr, "usage: %s -p pid [-t lid] [-A processor] "
"[-C class] [-P priority]\n", getprogname());
fprintf(stderr, "usage: %s [-t lid] [-A processor] "
"[-C class] [-P priority] {-p pid|command}\n", getprogname());
exit(EXIT_FAILURE);
}