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

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Date:	Thu, 10 Feb 2011 08:58:19 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	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,
	ngupta@...are.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 Thu, Feb 10, 2011 at 8:57 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> On Thu, Feb 10, 2011 at 1:39 AM, Dan Magenheimer
> <dan.magenheimer@...cle.com> 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 thought of these other differences, both technical and
>> non-technical:
>>
>> - Zram is minimally invasive to the swap subsystem, requiring only
>>  one hook which is already upstream (though see below) and is
>>  apparently already used by some Linux users.  Frontswap is somewhat
>
> Yes. I think what someone is using it is a problem.
>
>>  more invasive and, UNTIL zcache-was-kztmem was posted a few weeks
>>  ago, had no non-Xen users (though some distros are already shipping
>>  the hooks in their kernels because Xen supports it); as a result,
>>  frontswap has gotten almost no review by kernel swap subsystem
>>  experts who I'm guessing weren't interested in anything that
>>  required Xen to use... hopefully that barrier is now resolved
>>  (but bottom line is frontswap is not yet upstream).
>
> That's why I suggested to remove frontswap in this turn.
> If any swap experts has a interest, maybe you can't receive any ack or

Typo.
If any swap experts don't have a interest,


-- 
Kind regards,
Minchan Kim
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