On Wed 11-05-16 14:07:31, Qiang Huang wrote:
> The restriction of kmem setting is not there anymore because the
> accounting is enabled by default even in the cgroup v1 - see
> b313aeee2509 ("mm: memcontrol: enable kmem accounting for all
> cgroups in the legacy hierarchy").
>
> Update docs accordingly.
I am pretty sure there will be other things out of date in that file but
this is an improvemtn already.
> Signed-off-by: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Thanks!
> ---
> Documentation/cgroup-v1/memory.txt | 14 +++-----------
> 1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/Documentation/cgroup-v1/memory.txt b/Documentation/cgroup-v1/memory.txt
> index ff71e16..b14abf2 100644
> --- a/Documentation/cgroup-v1/memory.txt
> +++ b/Documentation/cgroup-v1/memory.txt
> @@ -280,17 +280,9 @@ 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
> possible to DoS the system by consuming too much of this precious resource.
>
> -Kernel memory won't be accounted at all until limit on a group is set. This
> -allows for existing setups to continue working without disruption. The limit
> -cannot be set if the cgroup have children, or if there are already tasks in the
> -cgroup. Attempting to set the limit under those conditions will return -EBUSY.
> -When use_hierarchy == 1 and a group is accounted, its children will
> -automatically be accounted regardless of their limit value.
> -
> -After a group is first limited, it will be kept being accounted until it
> -is removed. The memory limitation itself, can of course be removed by writing
> --1 to memory.kmem.limit_in_bytes. In this case, kmem will be accounted, but not
> -limited.
> +Kernel memory accounting is enabled for all memory cgroups by default. But
> +it can be disabled system-wide by passing cgroup.memory=nokmem to the kernel
> +at boot time. In this case, kernel memory will not be accounted at all.
>
> Kernel memory limits are not imposed for the root cgroup. Usage for the root
> cgroup may or may not be accounted. The memory used is accumulated into
> --
> 2.5.0
>
--
Michal Hocko
SUSE Labs
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