Re: [PATCH] cgroups: Allow dynamically changing net_classid

From: David Miller
Date: Mon Nov 23 2015 - 12:15:35 EST

From: Nina Schiff <ninasc@xxxxxx>
Date: Fri, 20 Nov 2015 12:16:10 -0800

> The classid of a process is changed either when a process is moved to
> or from a cgroup or when the net_cls.classid file is updated.
> Previously net_cls only supported propogating these changes to the
> cgroup's related sockets when a process was added or removed from the
> cgroup. This means it was neccessary to remove and re-add all processes
> to a cgroup in order to update its classid. This change introduces
> support for doing this dynamically - i.e. when the value is changed in
> the net_cls_classid file, this will also trigger an update to the
> classid associated with all sockets controlled by the cgroup.
> This mimics the behaviour of other cgroup subsystems.
> net_prio circumvents this issue by storing an index into a table with
> each socket (and so any updates to the table, don't require updating
> the value associated with the socket). net_cls, however, passes the
> socket the classid directly, and so this additional step is needed.
> Signed-off-by: Nina Schiff <ninasc@xxxxxx>

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