linux-kernel - Re: [PATCH 5/5] mm/compaction: clean-up code on success of ballon isolation

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Message-ID: <52F4B662.5070809@suse.cz>
Date:	Fri, 07 Feb 2014 11:33:06 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Mel Gorman <mgorman@...e.de>, Joonsoo Kim <js1304@...il.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] mm/compaction: clean-up code on success of ballon
 isolation

On 02/07/2014 06:08 AM, Joonsoo Kim wrote:
> It is just for clean-up to reduce code size and improve readability.
> There is no functional change.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> diff --git a/mm/compaction.c b/mm/compaction.c
> index 985b782..7a4e3b7 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -554,11 +554,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
>  			if (unlikely(balloon_page_movable(page))) {
>  				if (locked && balloon_page_isolate(page)) {
>  					/* Successfully isolated */
> -					cc->finished_update_migrate = true;
> -					list_add(&page->lru, migratelist);
> -					cc->nr_migratepages++;
> -					nr_isolated++;
> -					goto check_compact_cluster;
> +					goto isolate_success;
>  				}
>  			}
>  			continue;
> @@ -610,13 +606,14 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
>  		VM_BUG_ON(PageTransCompound(page));
>  
>  		/* Successfully isolated */
> -		cc->finished_update_migrate = true;
>  		del_page_from_lru_list(page, lruvec, page_lru(page));
> +
> +isolate_success:
> +		cc->finished_update_migrate = true;
>  		list_add(&page->lru, migratelist);
>  		cc->nr_migratepages++;
>  		nr_isolated++;
>  
> -check_compact_cluster:
>  		/* Avoid isolating too much */
>  		if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) {
>  			++low_pfn;
> 

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