linux-kernel - Re: [-mm] Add an owner to the mm

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Message-Id: <20080403154106.39f26460.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 3 Apr 2008 15:41:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Paul Menage <menage@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [-mm] Add an owner to the mm_struct (v5)

just nitpicks ;)

On Thu, 03 Apr 2008 11:29:01 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

>  #define mm_match_cgroup(mm, cgroup)	\
> -	((cgroup) == rcu_dereference((mm)->mem_cgroup))
> +	((cgroup) == mem_cgroup_from_task((mm)->owner))
>  

After this patch, above should be 
==
#define mm_match_cgroup_css(mm, css, subsys_id)
	((css) == task_subsys_state((mm)->owner, subsys_id) 
==
This generic macro may be good for your purpose.


>  #endif
> diff -puN init/Kconfig~memory-controller-add-mm-owner init/Kconfig
> --- linux-2.6.25-rc8/init/Kconfig~memory-controller-add-mm-owner	2008-04-03 10:08:23.000000000 +0530
> +++ linux-2.6.25-rc8-balbir/init/Kconfig	2008-04-03 10:08:23.000000000 +0530
> @@ -371,9 +371,21 @@ config RESOURCE_COUNTERS
>            infrastructure that works with cgroups
>  	depends on CGROUPS
>  
> +config MM_OWNER
> +	bool "Enable ownership of mm structure"
> +	help
> +	  This option enables mm_struct's to have an owner. The advantage
> +	  of this approach is that it allows for several independent memory
> +	  based cgorup controllers to co-exist independently without too
> +	  much space overhead
	 Above is an explanation for this patch.
	  More simple text is better... How about
	 ==
	  This is necessary for some cgroup subsystem related to memory management.
	 ==
> +
> +	  This feature adds fork/exit overhead. So enable this only if
> +	  you need resource controllers
> +


>  config CGROUP_MEM_RES_CTLR
>  	bool "Memory Resource Controller for Control Groups"
>  	depends on CGROUPS && RESOURCE_COUNTERS
> +	select MM_OWNER

I don't like "select"....this should be
	depends on CGROUPS && RESOURCE_COUNTERS && MM_OWNER

Thanks,
-Kame

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