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Date:	Mon, 14 Jul 2014 14:10:42 -0400
From:	Dan Streetman <ddstreet@...e.org>
To:	Seth Jennings <sjennings@...iantweb.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dan Streetman <ddstreet@...e.org>, Bob Liu <bob.liu@...cle.com>,
	Nitin Gupta <ngupta@...are.org>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Weijie Yang <weijie.yang@...sung.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Linux-MM <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv5 0/4] mm/zpool: add common api for zswap to use zbud/zsmalloc

Andrew, any thoughts on this latest version of the patch set?  Let me
know if I missed anything or you have any other suggestions.

Seth, did you get a chance to review this and/or test it out?



On Wed, Jul 2, 2014 at 5:45 PM, Dan Streetman <ddstreet@...e.org> wrote:
> In order to allow zswap users to choose between zbud and zsmalloc for
> the compressed storage pool, this patch set adds a new api "zpool" that
> provides an interface to both zbud and zsmalloc.  This does not include
> implementing shrinking in zsmalloc, which will be sent separately.
>
> I believe Seth originally was using zsmalloc for swap, but there were
> concerns about how significant the impact of shrinking zsmalloc would
> be when zswap had to start reclaiming pages.  That still may be an
> issue, but this at least allows users to choose themselves whether
> they want a lower-density or higher-density compressed storage medium.
> At least for situations where zswap reclaim is never or rarely reached,
> it probably makes sense to use the higher density of zsmalloc.
>
> Note this patch set does not change zram to use zpool, although that
> change should be possible as well.
>
> ---
> Changes since v4 : https://lkml.org/lkml/2014/6/2/711
>   -omit first patch, that removed gfp_t param from zpool_malloc()
>   -move function doc from zpool.h to zpool.c
>   -move module usage refcounting into patch that adds zpool
>   -add extra refcounting to prevent driver unregister if in use
>   -add doc clarifying concurrency usage
>   -make zbud/zsmalloc zpool functions static
>   -typo corrections
>
> Changes since v3 : https://lkml.org/lkml/2014/5/24/130
>   -In zpool_shrink() use # pages instead of # bytes
>   -Add reclaimed param to zpool_shrink() to indicate to caller
>    # pages actually reclaimed
>   -move module usage counting to zpool, from zbud/zsmalloc
>   -update zbud_zpool_shrink() to call zbud_reclaim_page() in a
>    loop until requested # pages have been reclaimed (or error)
>
> Changes since v2 : https://lkml.org/lkml/2014/5/7/927
>   -Change zpool to use driver registration instead of hardcoding
>    implementations
>   -Add module use counting in zbud/zsmalloc
>
> Changes since v1 https://lkml.org/lkml/2014/4/19/97
>  -remove zsmalloc shrinking
>  -change zbud size param type from unsigned int to size_t
>  -remove zpool fallback creation
>  -zswap manually falls back to zbud if specified type fails
>
>
> Dan Streetman (4):
>   mm/zbud: change zbud_alloc size type to size_t
>   mm/zpool: implement common zpool api to zbud/zsmalloc
>   mm/zpool: zbud/zsmalloc implement zpool
>   mm/zpool: update zswap to use zpool
>
>  include/linux/zbud.h  |   2 +-
>  include/linux/zpool.h | 106 +++++++++++++++
>  mm/Kconfig            |  43 +++---
>  mm/Makefile           |   1 +
>  mm/zbud.c             |  98 +++++++++++++-
>  mm/zpool.c            | 364 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  mm/zsmalloc.c         |  84 ++++++++++++
>  mm/zswap.c            |  75 ++++++-----
>  8 files changed, 722 insertions(+), 51 deletions(-)
>  create mode 100644 include/linux/zpool.h
>  create mode 100644 mm/zpool.c
>
> --
> 1.8.3.1
>
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