linux-kernel - Re: A desktop environment[1] kernel wishlist

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Message-ID: <54481091.3030306@gmx.de>
Date:	Wed, 22 Oct 2014 22:16:17 +0200
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Sergey <sergey@...mentaryos.org>, linux-kernel@...r.kernel.org
CC:	Jan Kara <jack@...e.cz>, Bastien Nocera <hadess@...ess.net>
Subject: Re: A desktop environment[1] kernel wishlist

On 21.10.2014 15:11, Sergey wrote:
> Hey everyone,
>
> I'm glad we're having some discussion on this, because we have almost
> exactly the same kernel wishlist internally for elementary OS / Pantheon DE.
>
> I believe I can further elaborate on the VFS monitoring part. We need a file
> monitoring facility that's scalable (unlike inotify) and can provide a
> decent level of detail (unlike fanotify). In particular, we need to be able
> to detect file/directory creation, renaming and removal events, as well as
> close_write event. And, in an ideal world, all of that without requiring
> root permissions.
When I read your wish, I guess adding the capability to watch mounts 
with inotify would satisfy your needs. Would you agree?

Best regards

Heinrich Schuchardt
>
> This can be almost accomplished by combining output of fanotify with that of
> a custom LSM module that just reports events to userspace (e.g. rlocate uses
> such a thing). There are two problems with this: first, it's a hideous hack,
> and second, it doesn't detect deletions.
>
> This is a big deal because without it we're stuck with always presenting the
> user with the filesystem. If you've seen library-based music players like
> Rhythmbox or Banshee, you know that they group and sort all your music by
> artist and album, but not by directory and file name, and that you can
> efficiently search all that metadata. We're trying to get the same thing
> into more applications, but the absence of VFS features described above is
> blocking us. Even after moving all the database management to a single
> daemon that does all the monitoring and very rarely has to rescan anything,
> the system either slows to a crawl (inotify) or the database gets out of
> date quickly (fanotify+LSM).
> In case I didn't make myself clear, a more detailed writeup on the design
> can be found here: http://tiny.cc/tearing-up-files
>
> Regarding the other items, AFAIK the kernel implements mechanism, not
> policy, so instead of "zswap selectively enabled by default" we just want
> "stable reliable zswap". We had to give up on zram previously (in pre-3.10
> days) because of kernel regressions leading to panics when zram was enabled.
> And we don't have the "Power management" part on our list because we haven't
> really delved in that yet. But our lists are identical in all the other
> areas, so that's not "just GNOME".
>
> PS: I'm not subscribed to LKML either, so please CC me.
>
> Cheers!
>
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