On 10/05/2018 02:43 PM, Pavel Hrdina wrote:
> When creating cgroup hierarchy we need to enable controllers in the
> parent cgroup in order to be usable. That means writing "+{controller}"
> into cgroup.subtree_control file. We can enable only controllers that
> are enabled for parent cgroup, that means we need to do that for the
> whole cgroup tree.
>
> Cgroups for threads needs to be handled differently in cgroup v2. There
> are two types of controllers:
>
> - domain controllers: these cannot be enabled for threads
> - threaded controllers: these can be enabled for threads
>
> In addition there are multiple types of cgroups:
>
> - domain: normal cgroup
> - domain threaded: a domain cgroup that serves as root for threaded
> cgroups
> - domain invalid: invalid cgroup, can be changed into threaded, this
> is the default state if you create subgroup inside
> domain threaded group or threaded group
> - threaded: threaded cgroup which can have domain threaded or
> threaded as parent group
>
> In order to create threaded cgroup it's sufficient to write "threaded"
> into cgroup.type file, it will automatically make parent cgroup
> "domain threaded" if it was only "domain". In case the parent cgroup
> is already "domain threaded" or "threaded" it will modify only the type
> of current cgroup. After that we can enable threaded controllers.
>
> Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> ---
> src/util/vircgroup.c | 2 +-
> src/util/vircgroupbackend.h | 1 +
> src/util/vircgroupv2.c | 76 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 78 insertions(+), 1 deletion(-)
ACK
Michal
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