linux-kernel - Re: [PATCH v5 02/12] mm: migrate: support non-lru movable page migration

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Date:	Tue, 17 May 2016 10:18:50 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Rafael Aquini <aquini@...hat.com>,
	<virtualization@...ts.linux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	John Einar Reitan <john.reitan@...s.arm.com>,
	<dri-devel@...ts.freedesktop.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Gioh Kim <gi-oh.kim@...fitbricks.com>
Subject: Re: [PATCH v5 02/12] mm: migrate: support non-lru movable page
 migration

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