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    SubjectRe: dirty balancing deadlock
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    > > > > 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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