Re: [PATCH 01/16 v5] pramfs: documentation

[Pavel Machek <pavel@ucw.cz>]

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?

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