linux-kernel - Re: [PATCH 5/5] memcg: rename cgroup_event to mem_cgroup

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Message-ID: <51FF1B7A.8070607@huawei.com>
Date:	Mon, 5 Aug 2013 11:26:50 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<hannes@...xchg.org>, <mhocko@...e.cz>, <bsingharora@...il.com>,
	<kamezawa.hiroyu@...fujitsu.com>, <cgroups@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] memcg: rename cgroup_event to mem_cgroup_event

On 2013/8/5 0:07, Tejun Heo wrote:
> cgroup_event is only available in memcg now.  Let's brand it that way.
> While at it, add a comment encouraging deprecation of the feature and
> remove the respective section from cgroup documentation.
> 
> This patch is cosmetic.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
>  Documentation/cgroups/cgroups.txt | 19 -------------
>  mm/memcontrol.c                   | 57 +++++++++++++++++++++++++--------------
>  2 files changed, 37 insertions(+), 39 deletions(-)
> 
> diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
> index 638bf17..ca5aee9 100644
> --- a/Documentation/cgroups/cgroups.txt
> +++ b/Documentation/cgroups/cgroups.txt
> @@ -472,25 +472,6 @@ you give a subsystem a name.
>  The name of the subsystem appears as part of the hierarchy description
>  in /proc/mounts and /proc/<pid>/cgroups.
> 

2. Usage Examples and Syntax
  2.1 Basic Usage
  2.2 Attaching processes
  2.3 Mounting hierarchies by name
  2.4 Notification API

remove the index ?
 
> -2.4 Notification API
> ---------------------
> -
> -There is mechanism which allows to get notifications about changing
> -status of a cgroup.
> -
> -To register a new notification handler you need to:
> - - create a file descriptor for event notification using eventfd(2);
> - - open a control file to be monitored (e.g. memory.usage_in_bytes);
> - - write "<event_fd> <control_fd> <args>" to cgroup.event_control.
> -   Interpretation of args is defined by control file implementation;
> -
> -eventfd will be woken up by control file implementation or when the
> -cgroup is removed.
> -
> -To unregister a notification handler just close eventfd.
> -
> -NOTE: Support of notifications should be implemented for the control
> -file. See documentation for the subsystem.
>  

Why not move this section to Documentation/cgroups/memory.txt?

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