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Date: Thu, 15 Oct 2015 18:53:28 +0900
From: Minchan Kim <minchan@kernel.org>
Subject: Re: [RFC v2 1/3] migrate: new struct migration and add it to struct
 page
Message-ID: <20151015095328.GA7001@bgram>
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Hui Zhu <zhuhui@xiaomi.com>, Nitin Gupta <ngupta@vflare.org>, Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Mel Gorman <mgorman@suse.de>, Dave Hansen <dave.hansen@linux.intel.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.com>, Konstantin Khlebnikov <khlebnikov@yandex-team.ru>, Andrea Arcangeli <aarcange@redhat.com>, Alexander Duyck <alexander.h.duyck@redhat.com>, Tejun Heo <tj@kernel.org>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Jennifer Herbert <jennifer.herbert@citrix.com>, Hugh Dickins <hughd@google.com>, Vladimir Davydov <vdavydov@parallels.com>, David Rientjes <rientjes@google.com>, Sasha Levin <sasha.levin@oracle.com>, "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Wanpeng Li <wanpeng.li@hotmail.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Greg Thelen <gthelen@google.com>, Al Viro <viro@zeniv.linux.org.uk>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, teawater@gmail.com

On Thu, Oct 15, 2015 at 11:27:15AM +0200, Vlastimil Babka wrote:
> On 10/15/2015 11:09 AM, Hui Zhu wrote:
> >I got that add function interfaces is really not a good idea.
> >So I add a new struct migration to put all migration interfaces and add
> >this struct to struct page as union of "mapping".
> 
> That's better, but not as flexible as the previously proposed
> approaches that Sergey pointed you at:
> 
>  http://lkml.iu.edu/hypermail/linux/kernel/1507.0/03233.html
>  http://lkml.iu.edu/hypermail/linux/kernel/1508.1/00696.html
> 
> There the operations are reachable via mapping, so we can support
> the special operations migration also when mapping is otherwise
> needed; your patch excludes mapping.
> 

Hello Hui,

FYI, I take over the work from Gioh and have a plan to improve the work.
So, Could you wait a bit? Of course, if you have better idea, feel free
to post it.

Thanks.

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