linux-kernel - Re: [PATCH 2/8] kstaled: documentation and config option.

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Message-ID: <4E7CDDAD.7010704@redhat.com>
Date:	Fri, 23 Sep 2011 15:27:41 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michael Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 2/8] kstaled: documentation and config option.

On 09/16/2011 11:39 PM, Michel Lespinasse wrote:
> Extend memory cgroup documentation do describe the optional idle page
> tracking features, and add the corresponding configuration option.
>
>
> Signed-off-by: Michel Lespinasse<walken@...gle.com>

> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -370,3 +370,13 @@ config CLEANCACHE
>   	  in a negligible performance hit.
>
>   	  If unsure, say Y to enable cleancache
> +
> +config KSTALED
> +       depends on CGROUP_MEM_RES_CTLR

Looking at patch #3, I wonder if this needs to be dependent
on 64 bit, or at least make sure this is not selected when
a user builds a 32 bit kernel with NUMA.

The reason is that on a 32 bit system we could run out of
page flags + zone bits + node bits.

> +       bool "Per-cgroup idle page tracking"
> +       help
> +         This feature allows the kernel to report the amount of user pages
> +	 in a cgroup that have not been touched in a given time.
> +	 This information may be used to size the cgroups and/or for
> +	 job placement within a compute cluster.
> +	 See Documentation/cgroups/memory.txt for a more complete description.



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