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sched_setscheduler.2: Document 2.6.39 changes to rules governing changes from SCHED_IDLE policy 

Since Linux 2.6.39, unprivileged processes under the
SCHED_IDLE policy can switch to another nonrealtime
policy if their nice value falls within the range
permitted by their RLIMIT_NICE limit.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2011-09-20 18:25:40 +02:00
parent 96f6255496
commit 7f98857ab9
1 changed files with 13 additions and 6 deletions
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19
man2/sched_setscheduler.2
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@ -44,11 +44,7 @@
.\"
.\" Worth looking at: http://rt.wiki.kernel.org/index.php
.\"
.\" FIXME: Linux 2.6.39: a thread operating under the SCHED_IDLE policy
.\" is now allowed to upgrade itself to the SCHED_BATCH or SCHED_OTHER
.\" policy if its RLIMIT_NICE resource limit is adequate.
.\"
.TH SCHED_SETSCHEDULER 2 2010-10-04 "Linux" "Linux Programmer's Manual"
.TH SCHED_SETSCHEDULER 2 2011-09-19 "Linux" "Linux Programmer's Manual"
.SH NAME
sched_setscheduler, sched_getscheduler \-
set and get scheduling policy/parameters
@ -358,11 +354,22 @@ as long as the effective user ID of the process making the change
matches the real or effective user ID of the target process.
.IP *
Special rules apply for the
.BR SCHED_IDLE :
.BR SCHED_IDLE .
In Linux kernels before 2.6.39,
an unprivileged process operating under this policy cannot
change its policy, regardless of the value of its
.BR RLIMIT_RTPRIO
resource limit.
In Linux kernels since 2.6.39,
.\" commit c02aa73b1d18e43cfd79c2f193b225e84ca497c8
an unprivileged process can switch to either the
.BR SCHED_BATCH
or the
.BR SCHED_NORMAL
policy so long as its nice value falls within the range permitted by its
.BR RLIMIT_NICE
resource limit (see
.BR getrlimit (2)).
.PP
Privileged
.RB ( CAP_SYS_NICE )