linux-kernel - Re: [PATCH 00/17] pramfs: persistent and protected RAM filesystem

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Date:	Sun, 10 Jun 2012 13:20:55 +0200
From:	Christian Stroetmann <stroetmann@...olinux.com>
To:	Marco Stornelli <marco.stornelli@...il.com>
CC:	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] pramfs: persistent and protected RAM filesystem

On Sun, June 10, 2012 Marco Stornelli wrote:
> Hi all,
>
> after the merge of pramfs in the LTSI kernel and after the "hot topic" 
> NVM Mapping API, here a new submission of pramfs code. Even if the 
> code won't be in mainline the review is really useful to me, so any 
> comment is welcome.
Hello

I think we have here two cases:
1. "A block of non-volatile RAM separate for normal system memory", 
[documentation Pramfs] and
2. The whole RAM is non-volatile and so the whole situation is changed, 
and an NVM Mapping API is needed and "hotly" discussed.

For 1. your solution is a very good concept that is getting around 
issues solely related with specific optimizations for disc-based file 
systems, like the 2 problems described in the documentation of Pramfs, but
for 2. there is no need for a file system anymore, as we use it today 
while working with a computer system, because data needs not to be 
written to a file system at all, and so the file system will become 
something like a backup system in the most common use cases of a 
computing device, if I should describe it a little bit too provocative. 
In this case your approach taken to handle the 2 problems mentioned in 
the documentation of Pramfs would have to be driven further by focusing 
more on the management of the RAM, the power, and the long-term data 
storage (backup) for harmonizing Pramfs with them. A further point is to 
make Pramfs bootable, if this not already possible somehow.
>
>
> The patch series is based on 3.5-rc2.
>
> Pramfs documentation:
>
> http://pramfs.sourceforge.net
>
> Git repo:
>
> git://pramfs.git.sourceforge.net/gitroot/pramfs/pramfs
>
> Marco

Have fun
Christian Stroetmann
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