linux-kernel - Re: [PATCH 01/10] mm/page_alloc: remove unlikely macro on free_one

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Date:	Fri, 04 Jul 2014 14:03:10 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	t.stanislaws@...sung.com, Gioh Kim <gioh.kim@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] mm/page_alloc: remove unlikely macro on free_one_page()

On 07/04/2014 09:57 AM, Joonsoo Kim wrote:
> Isolation is really rare case so !is_migrate_isolate() is
> likely case. Remove unlikely macro.

Good catch. Why not replace it with likely then? Any difference in the assembly?

> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  mm/page_alloc.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 8dac0f0..0d4cf7a 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -735,7 +735,7 @@ static void free_one_page(struct zone *zone,
>  	zone->pages_scanned = 0;
>  
>  	__free_one_page(page, pfn, zone, order, migratetype);
> -	if (unlikely(!is_migrate_isolate(migratetype)))
> +	if (!is_migrate_isolate(migratetype))
>  		__mod_zone_freepage_state(zone, 1 << order, migratetype);
>  	spin_unlock(&zone->lock);
>  }
> 

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