linux-kernel - Re: [PATCH V2 2/3] drivers/staging: zcache: host services and PAM services

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Message-ID: <4D52D091.1000504@vflare.org>
Date:	Wed, 09 Feb 2011 12:36:17 -0500
From:	Nitin Gupta <ngupta@...are.org>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	Minchan Kim <minchan.kim@...il.com>, gregkh@...e.de,
	Chris Mason <chris.mason@...cle.com>,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	matthew@....cx, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jeremy@...p.org, Kurt Hackel <kurt.hackel@...cle.com>,
	npiggin@...nel.dk, riel@...hat.com,
	Konrad Wilk <konrad.wilk@...cle.com>, mel@....ul.ie,
	kosaki.motohiro@...fujitsu.com, sfr@...b.auug.org.au,
	wfg@...l.ustc.edu.cn, tytso@....edu, viro@...iv.linux.org.uk,
	hughd@...gle.com, hannes@...xchg.org
Subject: Re: [PATCH V2 2/3] drivers/staging: zcache: host services and PAM
 services

On 02/09/2011 11:39 AM, Dan Magenheimer wrote:
>
>
>> From: Minchan Kim [mailto:minchan.kim@...il.com]
>
>> As I read your comment, I can't find the benefit of zram compared to
>> frontswap.
>
> Well, I am biased, but I agree that frontswap is a better technical
> solution than zram. ;-)  But "dynamic-ity" is very important to
> me and may be less important to others.
>


I agree that frontswap is better than zram when considering swap as the 
use case - no bio overhead, dynamic resizing. However, zram being a 
*generic* block-device has some unique cases too like hosting files on 
/tmp, various caches under /var or any place where a compressed 
in-memory block device can help.

So, frontswap and zram have overlapping use case of swap but are not the 
same.

Thanks,
Nitin
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