Re: dirty balancing deadlock

[Miklos Szeredi]

> > > > If so, writes to B will decrease the dirty memory threshold.
> > > 
> > > Yes, but not by enough.  Say A dirties a 1100 pages, limit is 1000.
> > > Some pages queued for writeback (doesn't matter how much).  B writes
> > > back 1, 1099 dirty remain in A, zero in B.  balance_dirty_pages() for
> > > B doesn't know that there's nothing more to write back for B, it's
> > > just waiting there for those 1099, which'll never get written.
> > 
> > hm, OK, arguable.  I guess something like this..
> 
> Doesn't help the fuse case, but does seem to help the loopback mount
> one.

No sorry, it doesn't even help the loopback deadlock.  It sometimes
takes quite a while to trigger...

Miklos
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