linux-kernel - Re: [PATCH v2 3/7] zsmalloc: support compaction

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Date:	Mon, 9 Mar 2015 09:05:06 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Heesub Shin <heesub.shin@...sung.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Juneho Choi <juno.choi@....com>,
	Gunho Lee <gunho.lee@....com>,
	Luigi Semenzato <semenzato@...gle.com>,
	Dan Streetman <ddstreet@...e.org>,
	Seth Jennings <sjennings@...iantweb.net>,
	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	opensource.ganesh@...il.com
Subject: Re: [PATCH v2 3/7] zsmalloc: support compaction

Hello Heesub,

On Thu, Mar 05, 2015 at 02:18:17PM +0900, Heesub Shin wrote:
> Hello Minchan,
> 
> Nice work!

Thanks. :)

> 
> On 03/04/2015 02:01 PM, Minchan Kim wrote:
> > +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);
> > +	insert_zspage(first_page, class, fullness);
> > +	fullness = fix_fullness_group(class, first_page);
> 
> Removal and re-insertion of zspage above can be eliminated, like this:
> 
> 	fullness = get_fullness_group(first_page);
> 	insert_zspage(first_page, class, fullness);
> 	set_zspage_mapping(first_page, class->index, fullness);

True.

Thanks for the review!

-- 
Kind regards,
Minchan Kim
--
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