linux-kernel - Re: [RFC][PATCH 04/10] zsmalloc: cosmetic compaction code adjustments

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Date:	Thu, 4 Jun 2015 12:14:12 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCH 04/10] zsmalloc: cosmetic compaction code adjustments

On Sat, May 30, 2015 at 12:05:22AM +0900, Sergey Senozhatsky wrote:
> change zs_object_copy() argument order to be (DST, SRC) rather
> than (SRC, DST). copy/move functions usually have (to, from)
> arguments order.

Yeb,

> 
> rename alloc_target_page() to isolate_target_page(). this
> function doesn't allocate anything, it isolates target page,
> pretty much like isolate_source_page().

The reason I named it as alloc_target_page is I had a plan to
alloc new page which might be helpful sometime but I cannot
think of any benefit now so I follow your your patch.

> 
> tweak __zs_compact() comment.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Acked-by: Minchan Kim <minchan@...nel.org>

> ---
>  mm/zsmalloc.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 9ef6f15..fa72a81 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -1469,7 +1469,7 @@ void zs_free(struct zs_pool *pool, unsigned long handle)
>  }
>  EXPORT_SYMBOL_GPL(zs_free);
>  
> -static void zs_object_copy(unsigned long src, unsigned long dst,
> +static void zs_object_copy(unsigned long dst, unsigned long src,
>  				struct size_class *class)
>  {
>  	struct page *s_page, *d_page;
> @@ -1610,7 +1610,7 @@ static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
>  
>  		used_obj = handle_to_obj(handle);
>  		free_obj = obj_malloc(d_page, class, handle);
> -		zs_object_copy(used_obj, free_obj, class);
> +		zs_object_copy(free_obj, used_obj, class);
>  		index++;
>  		record_obj(handle, free_obj);
>  		unpin_tag(handle);
> @@ -1626,7 +1626,7 @@ static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
>  	return ret;
>  }
>  
> -static struct page *alloc_target_page(struct size_class *class)
> +static struct page *isolate_target_page(struct size_class *class)
>  {
>  	int i;
>  	struct page *page;
> @@ -1714,11 +1714,11 @@ static unsigned long __zs_compact(struct zs_pool *pool,
>  		cc.index = 0;
>  		cc.s_page = src_page;
>  
> -		while ((dst_page = alloc_target_page(class))) {
> +		while ((dst_page = isolate_target_page(class))) {
>  			cc.d_page = dst_page;
>  			/*
> -			 * If there is no more space in dst_page, try to
> -			 * allocate another zspage.
> +			 * If there is no more space in dst_page, resched
> +			 * and see if anyone had allocated another zspage.
>  			 */
>  			if (!migrate_zspage(pool, class, &cc))
>  				break;
> -- 
> 2.4.2.337.gfae46aa
> 

-- 
Kind regards,
Minchan Kim
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