From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755154AbcEQBS5 (ORCPT <rfc822;w@1wt.eu>);
	Mon, 16 May 2016 21:18:57 -0400
Received: from LGEAMRELO11.lge.com ([156.147.23.51]:45037 "EHLO
	lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1755138AbcEQBSy (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 16 May 2016 21:18:54 -0400
X-Original-SENDERIP: 156.147.1.125
X-Original-MAILFROM: minchan@kernel.org
X-Original-SENDERIP: 165.244.98.203
X-Original-MAILFROM: minchan@kernel.org
X-Original-SENDERIP: 10.177.223.161
X-Original-MAILFROM: minchan@kernel.org
Date: Tue, 17 May 2016 10:18:50 +0900
From: Minchan Kim <minchan@kernel.org>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>, <linux-kernel@vger.kernel.org>,
        <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>, Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
        Rafael Aquini <aquini@redhat.com>,
        <virtualization@lists.linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        John Einar Reitan <john.reitan@foss.arm.com>,
        <dri-devel@lists.freedesktop.org>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Gioh Kim <gi-oh.kim@profitbricks.com>
Subject: Re: [PATCH v5 02/12] mm: migrate: support non-lru movable page
 migration
Message-ID: <20160517011850.GD31335@bbox>
References: <1462760433-32357-1-git-send-email-minchan@kernel.org>
 <1462760433-32357-3-git-send-email-minchan@kernel.org>
 <20160516071751.GA32079@swordfish>
MIME-Version: 1.0
In-Reply-To: <20160516071751.GA32079@swordfish>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-MIMETrack: Itemize by SMTP Server on LGEKRMHUB01/LGE/LG Group(Release 8.5.3FP6|November
 21, 2013) at 2016/05/17 10:18:46,
	Serialize by Router on LGEKRMHUB01/LGE/LG Group(Release 8.5.3FP6|November
 21, 2013) at 2016/05/17 10:18:46,
	Serialize complete at 2016/05/17 10:18:46
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, May 16, 2016 at 04:17:51PM +0900, Sergey Senozhatsky wrote:
> On (05/09/16 11:20), Minchan Kim wrote:
> [..]
> > +++ b/include/linux/migrate.h
> > @@ -32,11 +32,16 @@ extern char *migrate_reason_names[MR_TYPES];
> >  
> >  #ifdef CONFIG_MIGRATION
> >  
> > +extern int PageMovable(struct page *page);
> > +extern void __SetPageMovable(struct page *page, struct address_space *mapping);
> > +extern void __ClearPageMovable(struct page *page);
> >  extern void putback_movable_pages(struct list_head *l);
> >  extern int migrate_page(struct address_space *,
> >  			struct page *, struct page *, enum migrate_mode);
> >  extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
> >  		unsigned long private, enum migrate_mode mode, int reason);
> > +extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
> > +extern void putback_movable_page(struct page *page);
> >  
> >  extern int migrate_prep(void);
> >  extern int migrate_prep_local(void);
> 
> given that some of Movable users can be built as modules, shouldn't
> at least some of those symbols be exported via EXPORT_SYMBOL?

Those functions aim for VM compaction so driver shouldn't use it.
Only driver should be aware of are __SetPageMovable and __CleraPageMovable.
I will export them.

Thanks for the review, Sergey!
> 
> 	-ss