linux-kernel - Re: [PATCH] ksm: Expose configuration via sysctl

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Date:	Tue, 25 Feb 2014 12:15:28 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH] ksm: Expose configuration via sysctl

On Tue, Feb 25, 2014 at 12:28:04AM +0100, Alexander Graf wrote:
> Configuration of tunables and Linux virtual memory settings has traditionally
> happened via sysctl. Thanks to that there are well established ways to make
> sysctl configuration bits persistent (sysctl.conf).
> 
> KSM introduced a sysfs based configuration path which is not covered by user
> space persistent configuration frameworks.
> 
> In order to make life easy for sysadmins, this patch adds all access to all
> KSM tunables via sysctl as well. That way sysctl.conf works for KSM as well,
> giving us a streamlined way to make KSM configuration persistent.
> 
> Reported-by: Sasche Peilicke <speilicke@...e.com>
> Signed-off-by: Alexander Graf <agraf@...e.de>
> ---
>  kernel/sysctl.c |   10 +++++++
>  mm/ksm.c        |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 88 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 332cefc..2169a00 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -217,6 +217,9 @@ extern struct ctl_table random_table[];
>  #ifdef CONFIG_EPOLL
>  extern struct ctl_table epoll_table[];
>  #endif
> +#ifdef CONFIG_KSM
> +extern struct ctl_table ksm_table[];
> +#endif
>  
>  #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
>  int sysctl_legacy_va_layout;
> @@ -1279,6 +1282,13 @@ static struct ctl_table vm_table[] = {
>  	},
>  
>  #endif /* CONFIG_COMPACTION */
> +#ifdef CONFIG_KSM
> +	{
> +		.procname	= "ksm",
> +		.mode		= 0555,
> +		.child		= ksm_table,
> +	},
> +#endif

ksm can be a module, so this won't work.

Can we make those controls proper module parameters instead?
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