On Tue, 2007-08-21 at 17:34 +0200, Roch - PAE wrote:
> adrian cockcroft writes:
> > Why can't you adapt ZFS for swap? It does the transactional clustering of
> > random writes into sequential related blocks, aggressive prefetch on read,
> > and would also guard against corrupt blocks in swap. Anon-ZFS?
> > Adrian
>
> Good point. And It works already, swap to a zvol
For small values of "works". See:
6528296 system hang while zvol swap space shorted
Quoting from the evaluation:
"The txg_sync_thread T3 is waiting on a lock (vq_lock) held by a
zio_vdev_io_done thread T4 who is waiting on memory. The swapout
thread T1 who would release memory is blocked on a lock held by
paegout thread T2 who wants to start a transaction is blocked in
txg_wait_open due to T1. Thus completing the deadlock."
- Bill
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