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

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Date:	Tue, 17 May 2016 10:30:09 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	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 (05/17/16 10:18), Minchan Kim wrote:
[..]
> > >  #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.
> 

and PageMovable(), probably?

zsmalloc():

	VM_BUG_ON_PAGE(!PageMovable(page), page);


> Thanks for the review, Sergey!

no prob! sorry, I'm a bit slow and late here.

	-ss