linux-kernel - Re: [PATCH 1/1 linux-next] mm,compaction: move suitable_migration_target() under CONFIG

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Date:	Fri, 9 Jan 2015 22:30:30 +0100 (CET)
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>
Cc:	linux-mm@...ck.org
Subject: Re: [PATCH 1/1 linux-next] mm,compaction: move
 suitable_migration_target() under CONFIG_COMPACTION



> On 06 January 2015 at 18:21 Vlastimil Babka <vbabka@...e.cz> wrote:
>
>
> On 01/03/2015 05:04 PM, Fabian Frederick wrote:
> > suitable_migration_target() is only used by isolate_freepages()
> > Define it under CONFIG_COMPACTION || CONFIG_CMA is not needed.
> >
> > Fix the following warning:
> > mm/compaction.c:311:13: warning: 'suitable_migration_target' defined
> > but not used [-Wunused-function]
> >
> > Signed-off-by: Fabian Frederick <fabf@...net.be>
>
> I agree, I would just move it to the section where isolation_suitable() and
> related others are, maybe at the end of this section below
> update_pageblock_skip()?

Yes of course, that would solve the warning as well.

Fabian
>
> Vlastimil

>
> > ---
> >  mm/compaction.c | 44 ++++++++++++++++++++++----------------------
> >  1 file changed, 22 insertions(+), 22 deletions(-)
> >
> > diff --git a/mm/compaction.c b/mm/compaction.c
> > index 546e571..38b151c 100644
> > --- a/mm/compaction.c
> > +++ b/mm/compaction.c
> > @@ -307,28 +307,6 @@ static inline bool compact_should_abort(struct
> > compact_control *cc)
> >     return false;
> >  }
> > 
> > -/* Returns true if the page is within a block suitable for migration to */
> > -static bool suitable_migration_target(struct page *page)
> > -{
> > -   /* If the page is a large free page, then disallow migration */
> > -   if (PageBuddy(page)) {
> > -           /*
> > -            * We are checking page_order without zone->lock taken. But
> > -            * the only small danger is that we skip a potentially suitable
> > -            * pageblock, so it's not worth to check order for valid range.
> > -            */
> > -           if (page_order_unsafe(page) >= pageblock_order)
> > -                   return false;
> > -   }
> > -
> > -   /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> > -   if (migrate_async_suitable(get_pageblock_migratetype(page)))
> > -           return true;
> > -
> > -   /* Otherwise skip the block */
> > -   return false;
> > -}
> > -
> >  /*
> >   * Isolate free pages onto a private freelist. If @strict is true, will
> >abort
> >   * returning 0 on any invalid PFNs or non-free pages inside of the
> >pageblock
> > @@ -802,6 +780,28 @@ isolate_migratepages_range(struct compact_control *cc,
> > unsigned long start_pfn,
> > 
> >  #endif /* CONFIG_COMPACTION || CONFIG_CMA */
> >  #ifdef CONFIG_COMPACTION
> > +/* Returns true if the page is within a block suitable for migration to */
> > +static bool suitable_migration_target(struct page *page)
> > +{
> > +   /* If the page is a large free page, then disallow migration */
> > +   if (PageBuddy(page)) {
> > +           /*
> > +            * We are checking page_order without zone->lock taken. But
> > +            * the only small danger is that we skip a potentially suitable
> > +            * pageblock, so it's not worth to check order for valid range.
> > +            */
> > +           if (page_order_unsafe(page) >= pageblock_order)
> > +                   return false;
> > +   }
> > +
> > +   /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
> > +   if (migrate_async_suitable(get_pageblock_migratetype(page)))
> > +           return true;
> > +
> > +   /* Otherwise skip the block */
> > +   return false;
> > +}
> > +
> >  /*
> >   * Based on information in the current compact_control, find blocks
> >   * suitable for isolating free pages from and then isolate them.
> >
>
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