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

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Message-ID: <54AC1991.9060908@suse.cz>
Date:	Tue, 06 Jan 2015 18:21:21 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Fabian Frederick <fabf@...net.be>, linux-kernel@...r.kernel.org
CC:	linux-mm@...ck.org
Subject: Re: [PATCH 1/1 linux-next] mm,compaction: move suitable_migration_target()
 under CONFIG_COMPACTION

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()?

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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