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    SubjectRe: [dm-devel] [PATCH] DM-CRYPT: Scale to multiple CPUs
    > > >> 2) Per volume threads and mempools were added to solve low memory
    > > >> problems (exhausted mempools), isn't now possible deadlock here again?
    > > >
    > > > Increasing the number of parallel submitters does not increase deadlocks
    > > > with mempool as long as they don't nest. They would just
    > > > block each other, but eventually make progress as one finishes.
    > >
    > > I mean if they nest of course, sorry for confusion.
    > No change to that, it's the same as it always worked.
    > Anyways, Right now you would need to nest more than 16 times I think
    > to exhaust the mempool (or 8, but the pages are less critical I think)
    > For me that seems like a "don't do that if hurts" situation.

    If the mempools are per-instance (they are), it can nest any number of
    times, because each nested instance will get new mempools. It is not a


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