Hello Clemens, On Tue, Oct 11, 2011 at 1:40 PM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote: > Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx> Thanks for this. Do you have a pointer to the relevant kernel commit? Cheers, Michael > --- 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
