linux-kernel - Re: [PATCH] zsmalloc: remove unnecessary insertion/removal of zspage in compaction

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Date:	Wed, 25 Mar 2015 23:58:38 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jerome Marchand <jmarchan@...hat.com>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Dan Streetman <ddstreet@...e.org>,
	Seth Jennings <sjennings@...iantweb.net>,
	Ganesh Mahendran <opensource.ganesh@...il.com>,
	Luigi Semenzato <semenzato@...gle.com>,
	Gunho Lee <gunho.lee@....com>, Juneho Choi <juno.choi@....com>,
	Heesub Shin <heesub.shin@...sung.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] zsmalloc: remove unnecessary insertion/removal of zspage
 in compaction

I was missing mailing lists.
Ping again with correction.

On Mon, Mar 09, 2015 at 09:10:40AM +0900, Minchan Kim wrote:
> In putback_zspage, we don't need to insert a zspage into list of zspage
> in size_class again to just fix fullness group. We could do directly
> without reinsertion so we could save some instuctions.
> 
> Reported-by: Heesub Shin <heesub.shin@...sung.com>
> Signed-off-by: Minchan Kim <minchan@...nel.org>
> ---
>  mm/zsmalloc.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 71e4ef496918..e73a78cd340a 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -1707,14 +1707,14 @@ static struct page *alloc_target_page(struct size_class *class)
>  static void putback_zspage(struct zs_pool *pool, struct size_class *class,
>  				struct page *first_page)
>  {
> -	int class_idx;
>  	enum fullness_group fullness;
>  
>  	BUG_ON(!is_first_page(first_page));
>  
> -	get_zspage_mapping(first_page, &class_idx, &fullness);
> +	fullness = get_fullness_group(first_page);
>  	insert_zspage(first_page, class, fullness);
> -	fullness = fix_fullness_group(class, first_page);
> +	set_zspage_mapping(first_page, class->index, fullness);
> +
>  	if (fullness == ZS_EMPTY) {
>  		zs_stat_dec(class, OBJ_ALLOCATED, get_maxobj_per_zspage(
>  			class->size, class->pages_per_zspage));
> -- 
> 1.9.1
> 

-- 
Kind regards,
Minchan Kim
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