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Commit 19717542 authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Jonathan Corbet
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Documentation/memcg: update memcg/kmem status 



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

Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Signed-off-by: default avatarVladimir Davydov <vdavydov@parallels.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 82c91e87

Documentation/cgroups/memory.txt

+3 −5
Original line number Diff line number Diff line
@@ -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

init/Kconfig

+0 −6
Original line number Diff line number Diff line
@@ -1032,12 +1032,6 @@ 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 HUGETLB_PAGE