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authorShakeel Butt <shakeelb@google.com>2020-04-01 21:07:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-02 09:35:28 -0700
commit8965aa28cdf0e5c25b44c9da0f0fbb49c4c0d7a0 (patch)
treefa2caffc773b8613b655cf8da803beaf66a46f4d /mm/memcontrol.c
parent8a931f801340c2be10552c7b5622d5f4852f3a36 (diff)
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memcg: css_tryget_online cleanups
Currently multiple locations in memcg code, css_tryget_online() is being used. However it doesn't matter whether the cgroup is online for the callers. Online used to matter when we had reparenting on offlining and we needed a way to prevent new ones from showing up. The failure case for couple of these css_tryget_online usage is to fallback to root_mem_cgroup which kind of make bypassing the memcg limits possible for some workloads. For example creating an inotify group in a subcontainer and then deleting that container after moving the process to a different container will make all the event objects allocated for that group to the root_mem_cgroup. So, using css_tryget_online() is dangerous for such cases. Two locations still use the online version. The swapin of offlined memcg's pages and the memcg kmem cache creation. The kmem cache indeed needs the online version as the kernel does the reparenting of memcg kmem caches. For the swapin case, it has been left for later as the fallback is not really that concerning. With swap accounting enabled, if the memcg of the swapped out page is not online then the memcg extracted from the given 'mm' will be charged and if 'mm' is NULL then root memcg will be charged. However I could not find a code path where the given 'mm' will be NULL for swap-in case. Signed-off-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Roman Gushchin <guro@fb.com> Link: http://lkml.kernel.org/r/20200302203109.179417-1-shakeelb@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 07032c088608..6f64bff8fe17 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -656,7 +656,7 @@ retry:
*/
__mem_cgroup_remove_exceeded(mz, mctz);
if (!soft_limit_excess(mz->memcg) ||
- !css_tryget_online(&mz->memcg->css))
+ !css_tryget(&mz->memcg->css))
goto retry;
done:
return mz;
@@ -972,7 +972,8 @@ struct mem_cgroup *get_mem_cgroup_from_page(struct page *page)
return NULL;
rcu_read_lock();
- if (!memcg || !css_tryget_online(&memcg->css))
+ /* Page should not get uncharged and freed memcg under us. */
+ if (!memcg || WARN_ON_ONCE(!css_tryget(&memcg->css)))
memcg = root_mem_cgroup;
rcu_read_unlock();
return memcg;
@@ -985,10 +986,13 @@ EXPORT_SYMBOL(get_mem_cgroup_from_page);
static __always_inline struct mem_cgroup *get_mem_cgroup_from_current(void)
{
if (unlikely(current->active_memcg)) {
- struct mem_cgroup *memcg = root_mem_cgroup;
+ struct mem_cgroup *memcg;
rcu_read_lock();
- if (css_tryget_online(&current->active_memcg->css))
+ /* current->active_memcg must hold a ref. */
+ if (WARN_ON_ONCE(!css_tryget(&current->active_memcg->css)))
+ memcg = root_mem_cgroup;
+ else
memcg = current->active_memcg;
rcu_read_unlock();
return memcg;
@@ -6789,7 +6793,7 @@ void mem_cgroup_sk_alloc(struct sock *sk)
goto out;
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcpmem_active)
goto out;
- if (css_tryget_online(&memcg->css))
+ if (css_tryget(&memcg->css))
sk->sk_memcg = memcg;
out:
rcu_read_unlock();