linux-kernel - Re: [PATCH v3 10/16] zsmalloc: factor page chain functionality out

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Message-ID: <20160418003305.GA5882@swordfish>
Date:	Mon, 18 Apr 2016 09:33:05 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jlayton@...chiereds.net, bfields@...ldses.org,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, koct9i@...il.com,
	aquini@...hat.com, virtualization@...ts.linux-foundation.org,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Rik van Riel <riel@...hat.com>, rknize@...orola.com,
	Gioh Kim <gi-oh.kim@...fitbricks.com>,
	Sangseok Lee <sangseok.lee@....com>,
	Chan Gyun Jeong <chan.jeong@....com>,
	Al Viro <viro@...IV.linux.org.uk>,
	YiPing Xu <xuyiping@...ilicon.com>
Subject: Re: [PATCH v3 10/16] zsmalloc: factor page chain functionality out

Hello,

On (03/30/16 16:12), Minchan Kim wrote:
> @@ -1421,7 +1434,6 @@ static unsigned long obj_malloc(struct size_class *class,
>  	unsigned long m_offset;
>  	void *vaddr;
>  
> -	handle |= OBJ_ALLOCATED_TAG;

a nitpick, why did you replace this ALLOCATED_TAG assignment
with 2 'handle | OBJ_ALLOCATED_TAG'?

	-ss

>  	obj = get_freeobj(first_page);
>  	objidx_to_page_and_offset(class, first_page, obj,
>  				&m_page, &m_offset);
> @@ -1431,10 +1443,10 @@ static unsigned long obj_malloc(struct size_class *class,
>  	set_freeobj(first_page, link->next >> OBJ_ALLOCATED_TAG);
>  	if (!class->huge)
>  		/* record handle in the header of allocated chunk */
> -		link->handle = handle;
> +		link->handle = handle | OBJ_ALLOCATED_TAG;
>  	else
>  		/* record handle in first_page->private */
> -		set_page_private(first_page, handle);
> +		set_page_private(first_page, handle | OBJ_ALLOCATED_TAG);
>  	kunmap_atomic(vaddr);
>  	mod_zspage_inuse(first_page, 1);
>  	zs_stat_inc(class, OBJ_USED, 1);