Thread (1 message) 1 message, 1 author, 2011-10-11

Re: [PATCH] sched_rr_get_interval.2: update Linux notes

From: Michael Kerrisk <hidden>
Date: 2011-10-11 14:52:51

Possibly related (same subject, not in this thread)

Hello Clemens,

On Tue, Oct 11, 2011 at 1:40 PM, Clemens Ladisch [off-list ref] wrote:
Signed-off-by: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
Thanks for this. Do you have a pointer to the relevant kernel commit?

Cheers,

Michael

quoted hunk
--- 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 ()


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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