linux-kernel - Re: [v3 PATCH 5/5] doc: memcontrol: add description for wipe_on

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Message-Id: <0746F690-2C0C-4041-842A-19CEB28A5E45@oracle.com>
Date:   Thu, 10 Jan 2019 05:00:13 -0700
From:   William Kucharski <william.kucharski@...cle.com>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     Michal Hocko <mhocko@...e.com>, hannes@...xchg.org,
        shakeelb@...gle.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v3 PATCH 5/5] doc: memcontrol: add description for
 wipe_on_offline

Just a few grammar corrections since this is going into Documentation:


> On Jan 9, 2019, at 12:14 PM, Yang Shi <yang.shi@...ux.alibaba.com> wrote:
> 
> Add desprition of wipe_on_offline interface in cgroup documents.
Add a description of the wipe_on_offline interface to the cgroup documents.

> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Shakeel Butt <shakeelb@...gle.com>
> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
> ---
> Documentation/admin-guide/cgroup-v2.rst |  9 +++++++++
> Documentation/cgroup-v1/memory.txt      | 10 ++++++++++
> 2 files changed, 19 insertions(+)
> 
> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
> index 0290c65..e4ef08c 100644
> --- a/Documentation/admin-guide/cgroup-v2.rst
> +++ b/Documentation/admin-guide/cgroup-v2.rst
> @@ -1303,6 +1303,15 @@ PAGE_SIZE multiple when read back.
>         memory pressure happens. If you want to avoid that, force_empty will be
>         useful.
> 
> +  memory.wipe_on_offline
> +
> +        This is similar to force_empty, but it just does memory reclaim
> +        asynchronously in css offline kworker.
> +
> +        Writing into 1 will enable it, disable it by writing into 0.
Writing a 1 will enable it; writing a 0 will disable it.

> +
> +        It would reclaim as much as possible memory just as what force_empty does.
It will reclaim as much memory as possible, just as force_empty does.

> +
> 
> Usage Guidelines
> ~~~~~~~~~~~~~~~~
> diff --git a/Documentation/cgroup-v1/memory.txt b/Documentation/cgroup-v1/memory.txt
> index 8e2cb1d..1c6e1ca 100644
> --- a/Documentation/cgroup-v1/memory.txt
> +++ b/Documentation/cgroup-v1/memory.txt
> @@ -71,6 +71,7 @@ Brief summary of control files.
>  memory.stat			 # show various statistics
>  memory.use_hierarchy		 # set/show hierarchical account enabled
>  memory.force_empty		 # trigger forced page reclaim
> + memory.wipe_on_offline		 # trigger forced page reclaim when offlining
>  memory.pressure_level		 # set memory pressure notifications
>  memory.swappiness		 # set/show swappiness parameter of vmscan
> 				 (See sysctl's vm.swappiness)
> @@ -581,6 +582,15 @@ hierarchical_<counter>=<counter pages> N0=<node 0 pages> N1=<node 1 pages> ...
> 
> The "total" count is sum of file + anon + unevictable.
> 
> +5.7 wipe_on_offline
> +
> +This is similar to force_empty, but it just does memory reclaim asynchronously
> +in css offline kworker.
> +
> +Writing into 1 will enable it, disable it by writing into 0.
Writing a 1 will enable it; writing a 0 will disable it.

> +
> +It would reclaim as much as possible memory just as what force_empty does.
It will reclaim as much memory as possible, just as force_empty does.

> +
> 6. Hierarchy support
> 
> The memory controller supports a deep hierarchy and hierarchical accounting.
> -- 
> 1.8.3.1
>