Re: [fuse-devel] Remove old and unused by the fs.

[Nikolaus R. <Nik...@ra...>]

Stef Bon <ste...@pu...> writes:
> Hello,
>
> I'm looking at the possibility to make my fs make remove old and
> unused entries and inodes, so have only entries and inodes in memory
> which are active somehow.
>
> It's possible to make the fuse libraries in the session loop, (only
> lowlevel) do some cleaning and maintaining of the entries and inodes
> when idle, so when there is nothing to do. When using epoll in the
> session loop this is possible.

Alternatively you could do this in a background thread. But doing it in
the session loop is probably a better idea. The less parallelism the
better.


> If you for example do :
>
> cd /somedir/dira/dirb/
> ls
> cd ../../../otherdir
>
> and work there
>
> the entries of the /somedir/dira/dirb, and the contents, and
> /somedir/dira and somedir are not used anymore.
> The idea is to forget first the etries/inodes which have the most
> "distance" from the root.
> Then their parents and so on.

I don't think that's a good idea. Expiring the most deeply nested
entries seems rather arbitrary to me. I think you should expire the
least-recently accessed inodes, and you should expire just as many as
you need to keep the number of in-memory inodes below some fixed
maximum.



Best,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

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