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

From: Pavel Machek
Date: Mon Jan 03 2011 - 02:45:44 EST


> +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

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?

(cesky, pictures)
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