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

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Message-ID: <5577AA87.3080607@jp.fujitsu.com>
Date:	Wed, 10 Jun 2015 12:09:59 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, nao.horiguchi@...il.com,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, 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 2015/06/09 19:09, Xishi Qiu wrote:
> On 2015/6/9 15:06, Kamezawa Hiroyuki wrote:
>
>> On 2015/06/04 22:02, 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.
>>>
>>> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
>>
>> I can't see why do we need this switch. If this is set, all GFP_HIGHUSER will use
>> mirrored memory ?
>>
>> Or will you add special MMAP/madvise flag to use mirrored memory ?
>>
>
> Hi Kame,
>
> Yes,
>
> MMAP/madvise
> 	-> add VM_MIRROR
> 		-> add GFP_MIRROR
> 			-> use MIGRATE_MIRROR list to alloc mirrored pages
>
> So user can use mirrored memory. What do you think?
>

I see. please explain it (your final plan) in patch description or in cover page of patches.

Thanks,
-Kame


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