linux-kernel - Re: [PATCH 0/3] zram: generic RAM based compressed R/W block devices

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Date:	Thu, 17 Jun 2010 07:40:34 -0700
From:	Greg KH <greg@...ah.com>
To:	Nitin Gupta <ngupta@...are.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Cyp <cyp561@...il.com>, driverdev <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] zram: generic RAM based compressed R/W block
 devices

On Thu, Jun 17, 2010 at 07:09:01AM +0530, Nitin Gupta wrote:
> On 06/17/2010 12:13 AM, Greg KH wrote:
> > On Wed, Jun 16, 2010 at 07:44:20AM +0530, Nitin Gupta wrote:
> >> Hi Greg,
> >>
> >> On 05/28/2010 09:56 PM, Greg KH wrote:
> >>> On Fri, May 28, 2010 at 09:38:53PM +0530, Nitin Gupta wrote:
> >>>>
> >>>> On 05/24/2010 07:48 PM, Nitin Gupta wrote:
> >>>>> Creates RAM based block devices: /dev/zramX (X = 0, 1, ...).
> >>>>> Pages written to these disks are compressed and stored in memory
> >>>>> itself. These disks allow very fast I/O and compression provides
> >>>>> good amounts of memory savings.
> >>>>>
> >>>>> This is enhancement over existing ramzswap driver which creates
> >>>>> virtual block devices (/dev/ramzswapX) which could be used only
> >>>>> as swap disks.
> >>>>>
> >>>>> Now, with the ability to handle any kind of I/O request, zram
> >>>>> devices have lot more use cases:
> >>>>>  - /tmp storage
> >>>>>  - various caches under /var
> >>>>>  - swap disks
> >>>>>  - maybe even more! :)
> >>>>>
> >>>>> Performance numbers can be found at:
> >>>>> http://code.google.com/p/compcache/wiki/zramperf
> >>>>>
> >>>>
> >>>> Any reviews/comments, please?
> >>>
> >>> We are all busy with the .35-rc1 merge work at the moment, sorry.
> >>>
> >>
> >> Can you please apply these patches to linux-next?
> > 
> > Yes, I'm working on it, I should get to it by the end of this week.
> > 
> >> or maybe for .35-rc3/rc4 too?
> > 
> > No, this is not a bugfix, why would it be acceptable for the .35 kernel
> > release?
> > 
> 
> Since its a staging driver, I thought any kind of changes can be pulled in
> mainline too. Maybe I still don't understand how -staging works :)

staging works like any other part of the kernel tree when it comes to
merges with Linus, new stuff only goes in for the -rc1 release, bugfixes
only afterward.

thanks,

greg k-h
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