linux-kernel - Re: [PATCHv3 0/6] mm/zpool: add common api for zswap to use zbud/zsmalloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140527224410.GC25781@cerebellum.variantweb.net>
Date:	Tue, 27 May 2014 17:44:10 -0500
From:	Seth Jennings <sjennings@...iantweb.net>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Weijie Yang <weijie.yang@...sung.com>,
	Nitin Gupta <ngupta@...are.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bob Liu <bob.liu@...cle.com>, Hugh Dickins <hughd@...gle.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: [PATCHv3 0/6] mm/zpool: add common api for zswap to use
 zbud/zsmalloc

On Sat, May 24, 2014 at 03:06:03PM -0400, Dan Streetman 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.  Only minor changes
> to zbud's interface were needed.  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.

Much cleaner now, thanks Dan :)

A few more comments (see replies to 3/6 and 6/6)

Seth

> 
> ---
> 
> 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 (6):
>   mm/zbud: zbud_alloc() minor param change
>   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
>   mm/zpool: prevent zbud/zsmalloc from unloading when used
> 
>  include/linux/zbud.h  |   2 +-
>  include/linux/zpool.h | 214 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  mm/Kconfig            |  43 +++++-----
>  mm/Makefile           |   1 +
>  mm/zbud.c             | 113 ++++++++++++++++++++++----
>  mm/zpool.c            | 197 ++++++++++++++++++++++++++++++++++++++++++++++
>  mm/zsmalloc.c         |  86 ++++++++++++++++++++
>  mm/zswap.c            |  76 ++++++++++--------
>  8 files changed, 668 insertions(+), 64 deletions(-)
>  create mode 100644 include/linux/zpool.h
>  create mode 100644 mm/zpool.c
> 
> -- 
> 1.8.3.1
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/