Re: [RFC][PATCH 1/11] memcg: fix kconfig menu comment

[Randy Dunlap <randy.dunlap@oracle.com>]

On Thu, 23 Oct 2008 17:59:46 +0900 KAMEZAWA Hiroyuki wrote:

> Fixes menu help text for memcg-allocate-page-cgroup-at-boot.patch.
> 
> 
> Signed-off-by: KAMEZAWA hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> 
>  init/Kconfig |   16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> Index: mmotm-2.6.27+/init/Kconfig
> ===================================================================
> --- mmotm-2.6.27+.orig/init/Kconfig
> +++ mmotm-2.6.27+/init/Kconfig
> @@ -401,16 +401,20 @@ config CGROUP_MEM_RES_CTLR
>  	depends on CGROUPS && RESOURCE_COUNTERS
>  	select MM_OWNER
>  	help
> -	  Provides a memory resource controller that manages both page cache and
> -	  RSS memory.
> +	  Provides a memory resource controller that manages both anonymous
> +	  memory and page cache. (See Documentation/controllers/memory.txt)
>  
>  	  Note that setting this option increases fixed memory overhead
> -	  associated with each page of memory in the system by 4/8 bytes
> -	  and also increases cache misses because struct page on many 64bit
> -	  systems will not fit into a single cache line anymore.
> +	  associated with each page of memory in the system. By this,
> +	  20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
> +	  usage tracking struct at boot. Total amount of this is printed out
> +	  at boot.
>  
>  	  Only enable when you're ok with these trade offs and really
> -	  sure you need the memory resource controller.
> +	  sure you need the memory resource controller. Even when you enable
> +	  this, you can set "cgroup_disable=memory" at your boot option to
> +	  disable memoyr resource controller and you can avoid overheads.

	          memory

> +	  (and lose benefits of memory resource contoller)
>  
>  	  This config option also selects MM_OWNER config option, which
>  	  could in turn add some fork/exit overhead.


---
~Randy

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