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Documentation/memcg: warn about incomplete kmemcg state

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Kmemcg is currently under development and lacks some important features.
In particular, it does not have support of kmem reclaim on memory pressure
inside cgroup, which practically makes it unusable in real life.  Let's
warn about it in both Kconfig and Documentation to prevent complaints
arising.

Signed-off-by: Vladimir Davydov <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vladimir Davydov 2014-06-04 16:07:28 -07:00 • committed by Linus Torvalds
commit 2ee0646870
2 changed files with 11 additions and 0 deletions
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6
init/Kconfig
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@ -996,6 +996,12 @@ config MEMCG_KMEM
the kmem extension can use it to guarantee that no group of processes
will ever exhaust kernel resources alone.
WARNING: Current implementation lacks reclaim support. That means
allocation attempts will fail when close to the limit even if there
are plenty of kmem available for reclaim. That makes this option
unusable in real life so DO NOT SELECT IT unless for development
purposes.
config CGROUP_HUGETLB
bool "HugeTLB Resource Controller for Control Groups"
depends on RESOURCE_COUNTERS && HUGETLB_PAGE