Re: Journalling filesystems

[Ludovic Courtès]

Hi,

Today, 3 hours, 44 minutes, 10 seconds ago, Marcus Brinkmann wrote:
> I also have the feeling that there are other designs that can provide
> an alternative or supplement to this (mmh, persistence?
> check-pointing?  Versioning?)

Yes, persistence (ie. application and kernel state checkpointing and
rollback operations) is, in my opinion, one of the coolest things since
sliced bread.  ;-)  Linux 2.6 actually has so-called "software suspend"
which is exactly that.

There is a whole lot of interesting paper on that topic, among which a
very famous paper about L3 by Jochen Liedtke [1], a more recent one
about how this could be implemented in user-space on top of L4 [2], and
papers about the implementation of persistence in KeyKOS and EROS [3].

> In any case, this whole issue seems to me to be big enough for a dozen
> or so independent projects for themselves.

Sure.

Thanks,
Ludovic.

[1] http://os.inf.tu-dresden.de/L4/doc.html
[2] http://l4ka.org/projects/persistence/
[3] http://www.eros-os.org/devel/00Devel.html