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

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Date:	Mon, 8 Apr 2013 09:32:38 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Bob Liu <bob.liu@...cle.com>, Shuah Khan <shuah@...ehiking.org>
Subject: zsmalloc defrag (Was: [PATCH] mm: remove compressed copy from zram
 in-memory)

> 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
particular, I am wondering if your design will also
handle the requirements for zcache (especially for
cleancache pages) and perhaps also for ramster.

In https://lkml.org/lkml/2013/3/27/501 I suggested it
would be good to work together on a common design, but
you didn't reply.  Are you thinking that zsmalloc
improvements should focus only on zram, in which case
we may -- and possibly should -- end up with a different
allocator for frontswap-based/cleancache-based compression
in zcache (and possibly zswap)?

I'm just trying to determine if I should proceed separately
with my design (with Bob Liu, who expressed interest) or if
it would be beneficial to work together.

Thanks,
Dan
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