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Documentation/memcg: update memcg/kmem status

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Memcg/kmem reclaim support has been finally merged. Reflect this in the
documentation.

Acked-by: Michal Hocko <[email protected]>
Signed-off-by: Vladimir Davydov <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
This commit is contained in:
Vladimir Davydov 2015-04-01 17:30:36 +03:00 • committed by Jonathan Corbet
commit 197175427a
2 changed files with 3 additions and 11 deletions
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8
Documentation/cgroups/memory.txt
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@ -275,11 +275,6 @@ 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
@ -345,6 +340,9 @@ set:
In this case, the admin could set up K so that the sum of all groups is
never greater than the total memory, and freely set U at the cost of his
QoS.
WARNING: In the current implementation, memory reclaim will NOT be
triggered for a cgroup when it hits K while staying below U, which makes
this setup impractical.
U != 0, K >= U:
Since kmem charges will also be fed to the user counter and reclaim will be