linux-kernel - Re: zsmalloc defrag (Was: [PATCH] mm: remove compressed copy from zram in-memory)

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Message-ID: <20130410005449.GG6836@blaptop>
Date:	Wed, 10 Apr 2013 09:54:49 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hugh Dickins <hughd@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Shaohua Li <shli@...nel.org>, Bob Liu <bob.liu@...cle.com>,
	Shuah Khan <shuah@...ehiking.org>
Subject: Re: zsmalloc defrag (Was: [PATCH] mm: remove compressed copy from
 zram in-memory)

On Tue, Apr 09, 2013 at 01:37:47PM -0700, Dan Magenheimer wrote:
> > From: Minchan Kim [mailto:minchan@...nel.org]
> > Subject: Re: zsmalloc defrag (Was: [PATCH] mm: remove compressed copy from zram in-memory)
> > 
> > On Tue, Apr 09, 2013 at 10:27:19AM +0900, Minchan Kim wrote:
> > > Hi Dan,
> > >
> > > On Mon, Apr 08, 2013 at 09:32:38AM -0700, Dan Magenheimer wrote:
> > > > > From: Minchan Kim [mailto:minchan@...nel.org]
> > > > > Sent: Monday, April 08, 2013 12:01 AM
> > > > > Subject: [PATCH] mm: remove compressed copy from zram in-memory
> > > >
> > > > (patch removed)
> > > >
> > > > > Fragment ratio is almost same but memory consumption and compile time
> > > > > is better. I am working to add defragment function of zsmalloc.
> > > >
> > > > Hi Minchan --
> > > >
> > > > I would be very interested in your design thoughts on
> > > > how you plan to add defragmentation for zsmalloc.  In
> > >
> > > What I can say now about is only just a word "Compaction".
> > > As you know, zsmalloc has a transparent handle so we can do whatever
> > > under user. Of course, there is a tradeoff between performance
> > > and memory efficiency. I'm biased to latter for embedded usecase.
> > >
> > > And I might post it because as you know well, zsmalloc
> > 
> > Incomplete sentense,
> > 
> > I might not post it until promoting zsmalloc because as you know well,
> > zsmalloc/zram's all new stuffs are blocked into staging tree.
> > Even if we could add it into staging, as you know well, staging is where
> > every mm guys ignore so we end up needing another round to promote it. sigh.
> > 
> > I hope it gets better after LSF/MM.
> 
> If zsmalloc is moving in the direction of supporting only zram,
> why should it be promoted into mm, or even lib?  Why not promote
> zram into drivers and put zsmalloc.c in the same directory?

I don't want to make zsmalloc zram specific and will do best effort
to generalize it to all z* familiy. If it is hard to reach out
agreement, yes, forking could be a easy solution like other embedded
product company but I don't want it.


> 
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-- 
Kind regards,
Minchan Kim
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