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cgroups.7: Add more detail on v2 'cpu' controller and realtime threads 

Explicitly note the scheduling policies that are relevant for the
v2 'cpu' controller.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-10-09 11:45:43 +02:00
parent 4644794c1e
commit 0bef253ec5
1 changed files with 11 additions and 2 deletions
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man7/cgroups.7
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@ -1541,8 +1541,17 @@ so as to minimize the (small) cost of traversing the cgroup hierarchy.
.SS The cgroups v2 """cpu""" controller and realtime processes
As at Linux 4.15, the cgroups v2
.I cpu
controller does not support control of realtime processes,
and the controller can be enabled in the root cgroup only
controller does not support control of realtime threads
(specifically threads scheduled under any of the policies
.BR SCHED_FIFO ,
.BR SCHED_RR ,
described
.BR SCHED_DEADLINE ;
see
.BR sched (7)).
Therefore, the
.I cpu
controller can be enabled in the root cgroup only
if all realtime threads are in the root cgroup.
(If there are realtime processes in nonroot cgroups, then a
.BR write (2)