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mm: memcontrol: let v2 cgroups follow changes in system swappiness

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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@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: <stable@vger.kernel.org>	[4.5]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-05-05 16:22:03 -07:00 committed by Linus Torvalds
parent 145bdaa150
commit 4550c4e157
1 changed files with 4 additions and 0 deletions
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4
include/linux/swap.h
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@ -533,6 +533,10 @@ 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;