> > Arguably we just have the wrong backing-device here, and what we should do
> > is to propagate the real backing device's pointer through up into the
> > filesystem. There's machinery for this which things like DM stacks use.
> >
> > I wonder if the post-2.6.23 changes happened to make this problem go away.
>
> The per BDI dirty stuff in 24 should make this work, I just checked and
> loopback thingies seem to have their own BDI, so all should be well.
This is not only about loopback (I think the lockup can happen even
without loopback) --- the main problem is:
Why are there over-limit dirty pages that no one is writing?
Mikulas
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