Hello Clemens,

Thanks once again for this patch. See my notes below.

On Tue, Oct 11, 2011 at 1:40 PM, Clemens Ladisch [off-list ref] wrote:

(At this point, I think we can simply drop these source code comments
altogether. Your patch supplied the needed details.)

 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

I don't really want to document the SCHED_OTHER detail here. This page
is about SCHED_RR processes. The point about SCHED_OTHER is an
implementation detail that isn't relevant to SCHED_RR.

 .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.

Here's the goodies!

 .\" .SH BUGS
 .\" As of Linux 1.3.81
 .\" .BR sched_rr_get_interval ()

So, I tweaked your patch somewhat, and applied the patch below for
man-pages-3.36.

Cheers,

Michael

--- a/man2/sched_rr_get_interval.2
+++ b/man2/sched_rr_get_interval.2

@@ -102,16 +102,9 @@ is available define
 in
 .IR <unistd.h> .
 .SS Linux Notes
-.\" FIXME
-.\" From at least Linux 2.6.9, the following is no longer true
-.\" 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.
 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.
+Older Linux kernels provide a (nonportable) method of doing this.
 The quantum 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;

@@ -119,6 +112,11 @@ 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,
+.\" commit a4ec24b48ddef1e93f7578be53270f0b95ad666c
+the
+.BR 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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