linux-kernel - Re: [PATCHv13 0/4] zswap: compressed swap caching

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Message-ID: <51B9BC5E.6060407@oracle.com>
Date:	Thu, 13 Jun 2013 20:34:38 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dave Hansen <dave@...1.net>, Joe Perches <joe@...ches.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Hugh Dickens <hughd@...gle.com>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv13 0/4] zswap: compressed swap caching

Hi Seth,

On 06/04/2013 04:33 AM, Seth Jennings wrote:
> This is the latest version of the zswap patchset for compressed swap caching.
> This is submitted for merging into linux-next and inclusion in v3.11.
> 

Have you noticed that pool_pages >> stored_pages, like this:
[root@...dev32 zswap]# cat *
0
424057
99538
0
2749448
0
24
60018
16837
[root@...dev32 zswap]# cat pool_pages
97372
[root@...dev32 zswap]# cat stored_pages
53701
[root@...dev32 zswap]#

I think it's unreasonable to use more pool pages than stored pages!

Regards,
-Bob
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