linux-kernel - RE: [RFC/PATCH] zcache/ramster rewrite and promotion

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Message-ID: <f54214e7-cee4-4cbf-aad1-6c1f91867879@default>
Date:	Mon, 6 Aug 2012 07:07:23 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Konrad Wilk <konrad.wilk@...cle.com>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: RE: [RFC/PATCH] zcache/ramster rewrite and promotion

> From: Pekka Enberg [mailto:penberg@...nel.org]
> Subject: Re: [RFC/PATCH] zcache/ramster rewrite and promotion
> 
> Hi Dan,
> 
> On Wed, Aug 1, 2012 at 12:13 AM, Dan Magenheimer
> <dan.magenheimer@...cle.com> wrote:
> > Ramster does the same thing but manages it peer-to-peer across
> > multiple systems using kernel sockets.  One could argue that
> > the dependency on sockets makes it more of a driver than "mm"
> > but ramster is "memory management" too, just a bit more exotic.
> 
> How do you configure it?

Hi Pekka --

It looks like the build/configuration how-to at
https://oss.oracle.com/projects/tmem/dist/files/RAMster/HOWTO-v5-120214 
is out-of-date and I need to fix some things in it.  I'll post
a link to it after I update it.

> Can we move parts of the network protocol under
> net/ramster or something?

Ramster is built on top of kernel sockets.  Both that networking
part and the configuration part of the ramster code are heavily
leveraged from ocfs2 and I suspect there is a lot of similarity
to gfs code as well.  In the code for both of those filesystems
I think the network and configuration code lives in the same
directory with the file system, so that was the model I was following.

I'm OK with placing it wherever kernel developers want to put
it, as long as the reason is not NIMBY-ness. [1]  My preference
is to keep all the parts together, at least for the review phase,
but if there is a consensus that it belongs someplace else,
I will be happy to move it.

Dan

[1] http://en.wikipedia.org/wiki/NIMBY
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