linux-kernel - Re: [PATCH 01/16 v5] pramfs: documentation

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Message-ID: <20110103074526.GA2687@ucw.cz>
Date:	Mon, 3 Jan 2011 08:45:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Tim Bird <tim.bird@...sony.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 01/16 v5] pramfs: documentation

Hi!

> +But the disk-based fs over non-volatile RAM block driver approach has
> +some drawbacks:
> +
> +1. Complexity of disk-based fs: disk-based filesystems such as ext2/ext3/ext4
> +   were designed for optimum performance on spinning disk media, so they
> +   implement features such as block groups, which attempts to group inode data
> +   into a contiguous set of data blocks to minimize disk seeking when accessing
> +   files. For RAM there is no such concern; a file's data blocks can be

Yes, and they are also used on 99% of machines out there -> well
debugged.

Is there fsck for pramfs available, for example?

> +   This increases the efficient use of space on the media, i.e. more
> +   space is dedicated to actual file data storage and less to meta-data
> +   needed to maintain that file data.

So... how big is overhead of pramfs compared to ext2?

Can pramfs handle powerdown at arbitrary time?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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