[CRIU] [PATCH] Attempt to restore cgroups

[Pavel Emelyanov]

On 07/08/2014 09:36 PM, Tycho Andersen wrote:
> During the dump phase, /proc/cgroups is parsed to find co-mounted cgroups.
> Then, for each task /proc/self/cgroup is parsed for the cgroups that it is a
> member of, and that cgroup is traversed to find any child cgroups which may
> also need restoring. All of this information is persisted along with the
> original cg_sets, which indicate which cgroups a task is a member of.
> 
> On restore, an initial phase creates all the cgroups which were saved and
> attempts to restore any peroperties they had. Then the tasks are restored into
> their respective cgroups via cg_sets as usual.
> 
> Signed-off-by: Tycho Andersen <tycho.andersen at canonical.com>
> ---

> diff --git a/include/cgroup.h b/include/cgroup.h
> index 148b26f..fc386fa 100644
> --- a/include/cgroup.h
> +++ b/include/cgroup.h
> @@ -7,5 +7,52 @@ int dump_task_cgroup(struct pstree_item *, u32 *);
>  int dump_cgroups(void);
>  int prepare_task_cgroup(struct pstree_item *);
>  int prepare_cgroup(void);
> +/* Restore things like cpu_limit in known cgroups. */
> +int prepare_cgroup_properties(void);
>  void fini_cgroup(void);
> +
> +#define HAS_MEM_LIMIT	(1 << 0)
> +#define HAS_CPU_SHARES	(1 << 1)
> +

Tycho, would you remove the mem limit and cpu shared so I could merge
the patch. Apparently this part will be heavily reworked, and it would
be better not to have temporary stuff in the commit.

Thanks,
Pavel