| sched_4bsd.4 (159594) | sched_4bsd.4 (170312) |
|---|---|
| 1.\" Copyright (c) 2005 Robert N. M. Watson 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" | 1.\" Copyright (c) 2005 Robert N. M. Watson 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" |
| 25.\" $FreeBSD: head/share/man/man4/sched_4bsd.4 159594 2006-06-14 02:16:51Z delphij $ | 25.\" $FreeBSD: head/share/man/man4/sched_4bsd.4 170312 2007-06-05 01:10:47Z delphij $ |
| 26.\" | 26.\" |
| 27.Dd April 7, 2005 | 27.Dd June 5, 2007 |
| 28.Os 29.Dt SCHED_4BSD 4 30.Sh NAME 31.Nm sched_4bsd 32.Nd "4.4BSD scheduler" 33.Sh SYNOPSIS 34.Cd "options SCHED_4BSD" 35.Sh DESCRIPTION --- 19 unchanged lines hidden (view full) --- 55.It Va kern.sched.preemption 56This read-only sysctl reports whether or not the kernel is configured to 57support preemption, which reduces the latency to run lower priority threads 58on wakeup. 59.El 60.Pp 61Some sysctls will be available only on systems supporting SMP. 62.Sh SEE ALSO | 28.Os 29.Dt SCHED_4BSD 4 30.Sh NAME 31.Nm sched_4bsd 32.Nd "4.4BSD scheduler" 33.Sh SYNOPSIS 34.Cd "options SCHED_4BSD" 35.Sh DESCRIPTION --- 19 unchanged lines hidden (view full) --- 55.It Va kern.sched.preemption 56This read-only sysctl reports whether or not the kernel is configured to 57support preemption, which reduces the latency to run lower priority threads 58on wakeup. 59.El 60.Pp 61Some sysctls will be available only on systems supporting SMP. 62.Sh SEE ALSO |
| 63.Xr sched_core 4 , | |
| 64.Xr sched_ule 4 , 65.Xr sysctl 8 66.Sh HISTORY 67The 68.Nm 69scheduler has been present, in various forms, since the inception of 70.Bx . 71.Sh BUGS 72While a highly robust and time-tested scheduler, 73.Nm 74lacks specific knowledge of how to schedule advantageously in non-symmetric 75processor configurations, such as hyper-threading. | 63.Xr sched_ule 4 , 64.Xr sysctl 8 65.Sh HISTORY 66The 67.Nm 68scheduler has been present, in various forms, since the inception of 69.Bx . 70.Sh BUGS 71While a highly robust and time-tested scheduler, 72.Nm 73lacks specific knowledge of how to schedule advantageously in non-symmetric 74processor configurations, such as hyper-threading. |