From: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
To: Michael Kerrisk
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] sched_rr_get_interval.2: update Linux notes
Date: Tue, 11 Oct 2011 13:40:20 +0200 [thread overview]
Message-ID: <4E942B24.2080608@ladisch.de> (raw)
Signed-off-by: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
--- a/man2/sched_rr_get_interval.2
+++ b/man2/sched_rr_get_interval.2
@@ -98,18 +98,24 @@
.\" for SCHED_RR processes. For RR processes the timeslice is always
.\" DEF_TIMESLICE, or 0.1 secs.
.\" Was the following really true for older kernels?
-.\" Must build a 2.6.8 kernel and retest, and rewrite the following text
-.\" appropriately.
+.\" It is again true for at least Linux 2.6.12, but stopped in 2.6.24.
POSIX does not specify any mechanism for controlling the size of the
round-robin time quantum.
However, Linux provides a (nonportable) method of doing this.
-The quantum can be controlled by adjusting the process's nice value (see
+The quantum of both
+.B SCHED_RR
+and
+.B SCHED_OTHER
+processes can be controlled by adjusting the process's nice value (see
.BR setpriority (2)).
Assigning a negative (i.e., high) nice value results in a longer quantum;
assigning a positive (i.e., low) nice value results in a shorter quantum.
The default quantum is 0.1 seconds;
the degree to which changing the nice value affects the
quantum has varied somewhat across kernel versions.
+Since Linux 2.6.24, the
+.B SCHED_RR
+quantum cannot be modified.
.\" .SH BUGS
.\" As of Linux 1.3.81
.\" .BR sched_rr_get_interval ()
--
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next reply other threads:[~2011-10-11 11:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-11 11:40 Clemens Ladisch [this message]
[not found] ` <4E942B24.2080608-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2011-10-11 14:52 ` [PATCH] sched_rr_get_interval.2: update Linux notes Michael Kerrisk
[not found] ` <CAKgNAkgq42JVZ0whV-13Qq=3QJNgbuApxJuLHeg4sUtkbexDMA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-10-11 16:03 ` Clemens Ladisch
2011-10-16 5:08 ` Michael Kerrisk
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