linux-kernel - Re: [PATCH 1/2] mm: introduce memory.min

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Date:   Fri, 20 Apr 2018 10:01:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Roman Gushchin <guro@...com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        kernel-team@...com, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 1/2] mm: introduce memory.min

On 04/20/18 09:36, Roman Gushchin wrote:

> ---
>  Documentation/cgroup-v2.txt  | 20 +++++++++
>  include/linux/memcontrol.h   | 15 ++++++-
>  include/linux/page_counter.h | 11 ++++-
>  mm/memcontrol.c              | 99 ++++++++++++++++++++++++++++++++++++--------
>  mm/page_counter.c            | 63 ++++++++++++++++++++--------
>  mm/vmscan.c                  | 19 ++++++++-
>  6 files changed, 189 insertions(+), 38 deletions(-)
> 
> diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
> index 657fe1769c75..49c846020f96 100644
> --- a/Documentation/cgroup-v2.txt
> +++ b/Documentation/cgroup-v2.txt
> @@ -1002,6 +1002,26 @@ PAGE_SIZE multiple when read back.
>  	The total amount of memory currently being used by the cgroup
>  	and its descendants.
>  
> +  memory.min
> +	A read-write single value file which exists on non-root
> +	cgroups.  The default is "0".
> +
> +	Hard memory protection.  If the memory usage of a cgroup
> +	is within its effectife min boundary, the cgroup's memory

	              effective

> +	won't be reclaimed under any conditions. If there is no
> +	unprotected reclaimable memory available, OOM killer
> +	is invoked.
> +
> +	Effective low boundary is limited by memory.min values of
> +	all ancestor cgroups. If there is memory.mn overcommitment

	                                  memory.min ? overcommit

> +	(child cgroup or cgroups are requiring more protected memory,

	                                          drop ending ','  ^^

> +	than parent will allow), then each child cgroup will get
> +	the part of parent's protection proportional to the its

	                                             to its

> +	actual memory usage below memory.min.
> +
> +	Putting more memory than generally available under this
> +	protection is discouraged and may lead to constant OOMs.
> +
>    memory.low
>  	A read-write single value file which exists on non-root
>  	cgroups.  The default is "0".


-- 
~Randy