linux-kernel - Re: [RFC v2 1/3] migrate: new struct migration and add it to struct page

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Date:	Thu, 15 Oct 2015 11:27:15 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Hui Zhu <zhuhui@...omi.com>, Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.com>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...hat.com>,
	Tejun Heo <tj@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Jennifer Herbert <jennifer.herbert@...rix.com>,
	Hugh Dickins <hughd@...gle.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	David Rientjes <rientjes@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Wanpeng Li <wanpeng.li@...mail.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Greg Thelen <gthelen@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	teawater@...il.com
Subject: Re: [RFC v2 1/3] migrate: new struct migration and add it to struct
 page

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.

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