linux-kernel - Re: [PATCH] zram: update zram to use zpool

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] [day] [month] [year] [list]

Date:	Mon, 20 Jun 2016 17:00:21 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Vitaly Wool <vitalywool@...il.com>
CC:	Geliang Tang <geliangtang@...il.com>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Dan Streetman <ddstreet@...e.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] zram: update zram to use zpool

On Fri, Jun 17, 2016 at 10:30:58AM +0200, Vitaly Wool wrote:
> Hi Minchan,
> 
> On Thu, Jun 16, 2016 at 1:17 AM, Minchan Kim <minchan@...nel.org> wrote:
> > On Wed, Jun 15, 2016 at 10:42:07PM +0800, Geliang Tang wrote:
> >> Change zram to use the zpool api instead of directly using zsmalloc.
> >> The zpool api doesn't have zs_compact() and zs_pool_stats() functions.
> >> I did the following two things to fix it.
> >> 1) I replace zs_compact() with zpool_shrink(), use zpool_shrink() to
> >>    call zs_compact() in zsmalloc.
> >> 2) The 'pages_compacted' attribute is showed in zram by calling
> >>    zs_pool_stats(). So in order not to call zs_pool_state() I move the
> >>    attribute to zsmalloc.
> >>
> >> Signed-off-by: Geliang Tang <geliangtang@...il.com>
> >
> > NACK.
> >
> > I already explained why.
> > http://lkml.kernel.org/r/20160609013411.GA29779@bbox
> 
> This is a fair statement, to a certain extent. I'll let Geliang speak
> for himself but I am personally interested in this zram extension
> because I want it to work on MMU-less systems. zsmalloc can not handle
> that, so I want to be able to use zram over z3fold.

Could you tell me more detail? What's the usecase?

> 
> Best regards,
>    Vitaly
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>