Re: bogosort (was Re: Re: [RFC][PATCH -mm 5/6] Freezer: Use freezing timeout more efficiently)

Rafael J. Wysocki
2007-07-23T19:16:43Z

Hi,

On Monday, 23 July 2007 10:04, Pavel Machek wrote:
> Hi!
>
> > > > > Task here is to sort the tasks, and freeze them in such order that
> > > > > freezing works, right? Yep, we do not know the dependencies
> > > > > explicitely... but what you invented is bogosort.
> > > >
> > > > Define, please?
> > >
> > > Uff, sorry. http://en.wikipedia.org/wiki/Bogosort .
> >
> > So this thing is not bogosort, because it makes the tasks that haven't frozen
> > appear on the bottom. IOW, the first (failing) freezing attempt is used as
> > a sieve, so the process is not completely random.
>
> Aha..
>
> > > Hmm, if someone wants to retry... perhaps we should just return
> > > specific error and let the _userland_ do the retries? It can do it as
> > > efficiently as outer loop in freezer...
> >
> > No, because _that_ would be bogosort, as defined in Wikipedia. :-)
>
> Ok, I see. It is better than bogosort... but still ugly. Can we at
> least have someone tell us it helps with fuse before we proceed?

Well, I think Matthew has a failing system. :-)

Anyway, I have an idea how to improve it, but first I'd like to flush the
patch queue ...

Greetings,
Rafael

--
"Premature optimization is the root of all evil." - Donald Knuth