linux-kernel - Re: [RFC][PATCHv3 2/7] zsmalloc: partial page ordering within a fullness

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Date:	Thu, 18 Jun 2015 21:45:26 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	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][PATCHv3 2/7] zsmalloc: partial page ordering within a
 fullness_list

On (06/18/15 21:13), Sergey Senozhatsky wrote:
> I think it makes sense to also consider 'fullness_group fullness' in
> insert_zspage(). Unconditionally put ZS_ALMOST_FULL pages to list
> head, or (if zspage is !ZS_ALMOST_FULL) compage ->inuse.
> 
> IOW, something like this
> 
> ---
> 
>  mm/zsmalloc.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 692b7dc..d576397 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -645,10 +645,11 @@ static void insert_zspage(struct page *page, struct size_class *class,
>  		 * We want to see more ZS_FULL pages and less almost
>  		 * empty/full. Put pages with higher ->inuse first.
>  		 */
> -		if (page->inuse < (*head)->inuse)
> -			list_add_tail(&page->lru, &(*head)->lru);
> -		else
> +		if (fullness == ZS_ALMOST_FULL ||
> +				(page->inuse >= (*head)->inuse))
>  			list_add(&page->lru, &(*head)->lru);
> +		else
> +			list_add_tail(&page->lru, &(*head)->lru);
>  	}
>  
>  	*head = page;
> 


             almost_full         full almost_empty obj_allocated   obj_used pages_used

Base
 Total                 3          168           26          2324       1822        307
 Total                 3          167           29          2391       1815        314
 Total                 5          172           25          2392       1827        313

Patched
 Total                 4          180           27          2425       1835        327
 Total                 4          169           27          2405       1825        312
 Total                 2          176           28          2452       1825        315


... no chance the test is right.

	-ss
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