linux-kernel - Re: [RFC PATCH 08/12] mm: use mirrorable to switch allocate mirrored memory

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Message-ID: <20150612080518.GA19075@hori1.linux.bs1.fc.nec.co.jp>
Date:	Fri, 12 Jun 2015 08:05:18 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"nao.horiguchi@...il.com" <nao.horiguchi@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Luck, Tony" <tony.luck@...el.com>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 08/12] mm: use mirrorable to switch allocate
 mirrored memory

On Thu, Jun 04, 2015 at 09:02:49PM +0800, Xishi Qiu wrote:
> Add a new interface in path /proc/sys/vm/mirrorable. When set to 1, it means
> we should allocate mirrored memory for both user and kernel processes.

As Dave and Kamezawa-san commented, documentation is not enough, so please
add a section in Documentation/sysctl/vm.txt for this new tuning parameter.

Thanks,
Naoya Horiguchi

> 
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>  include/linux/mmzone.h | 1 +
>  kernel/sysctl.c        | 9 +++++++++
>  mm/page_alloc.c        | 1 +
>  3 files changed, 11 insertions(+)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index f82e3ae..20888dd 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -85,6 +85,7 @@ struct mirror_info {
>  };
>  
>  extern struct mirror_info mirror_info;
> +extern int sysctl_mirrorable;
>  #  define is_migrate_mirror(migratetype) unlikely((migratetype) == MIGRATE_MIRROR)
>  #else
>  #  define is_migrate_mirror(migratetype) false
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 2082b1a..dc2625e 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -1514,6 +1514,15 @@ static struct ctl_table vm_table[] = {
>  		.extra2		= &one,
>  	},
>  #endif
> +#ifdef CONFIG_MEMORY_MIRROR
> +	{
> +		.procname	= "mirrorable",
> +		.data		= &sysctl_mirrorable,
> +		.maxlen		= sizeof(sysctl_mirrorable),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec_minmax,
> +	},
> +#endif
>  	{
>  		.procname	= "user_reserve_kbytes",
>  		.data		= &sysctl_user_reserve_kbytes,
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 249a8f6..63b90ca 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -212,6 +212,7 @@ int user_min_free_kbytes = -1;
>  
>  #ifdef CONFIG_MEMORY_MIRROR
>  struct mirror_info mirror_info;
> +int sysctl_mirrorable = 0;
>  #endif
>  
>  static unsigned long __meminitdata nr_kernel_pages;
> -- 
> 2.0.0
> 
> 
> --
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