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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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5
Documentation/cgroups/memory.txt
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@ -270,6 +270,11 @@ When oom event notifier is registered, event will be delivered.
2.7 Kernel Memory Extension (CONFIG_MEMCG_KMEM)
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.
With the Kernel memory extension, the Memory Controller is able to limit
the amount of kernel memory used by the system. Kernel memory is fundamentally
different than user memory, since it can't be swapped out, which makes it