On Fri 08-04-16 18:49:04, Johannes Weiner wrote:
> Cgroup2 currently doesn't have a per-cgroup swappiness setting. We
> might want to add one later - that's a different discussion - but
> until we do, the cgroups should always follow the system setting.
> Otherwise it will be unchangeably set to whatever the ancestor
> inherited from the system setting at the time of cgroup creation.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 4.5
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> include/linux/swap.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index e58dba3..15d17c8 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -534,6 +534,10 @@ static inline swp_entry_t get_swap_page(void)
> #ifdef CONFIG_MEMCG
> static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
> {
> + /* Cgroup2 doesn't have per-cgroup swappiness */
> + if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
> + return vm_swappiness;
> +
> /* root ? */
> if (mem_cgroup_disabled() || !memcg->css.parent)
> return vm_swappiness;
> --
> 2.8.0
--
Michal Hocko
SUSE Labs
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