Re: Any chance to get snapshot-aware defragmentation?

["Niccolò Belli" <darkbasic@linuxsystems.it>]

On venerdì 18 maggio 2018 18:20:51 CEST, David Sterba wrote:
> Josef started working on that in 2014 and did not finish it. The patches
> can be still found in his tree. The problem is in excessive memory
> consumption when there are many snapshots that need to be tracked during
> the defragmentation, so there are measures to avoid OOM. There's
> infrastructure ready for use (shrinkers), there are maybe some problems
> but fundamentally is should work.
>
> I'd like to get the snapshot-aware working again too, we'd need to find
> a volunteer to resume the work on the patchset.

Yeah I know of Josef's work, but 4 years had passed since then without any 
news on this front.

What I would really like to know is why nobody resumed his work: is it 
because it's impossible to implement snapshot-aware degram without 
excessive ram usage or is it simply because nobody is interested?

Niccolò