linux-kernel - Re: [PATCHv5 0/4] mm/zpool: add common api for zswap to use zbud/zsmalloc

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Date:	Wed, 16 Jul 2014 15:59:07 -0500
From:	Seth Jennings <sjennings@...iantweb.net>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	Andrew Morton <akpm@...ux-foundation.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

On Mon, Jul 14, 2014 at 02:10:42PM -0400, Dan Streetman wrote:
> 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?

I did have a chance to test it out quickly and didn't run into any
issues.  Your patchset is already in linux-next so I'll test more from
there.

Seth

> 
> 
> 
> 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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