Il 08/10/2013 14:33, Kevin Wolf ha scritto: >>> > > this converts read, write and flush functions from aio to coroutines. >> > >> > I'm not sure it's already the time for this... Cancellation sucks in >> > QEMU, and this is going to make things even worse. > Not sure what you're referring to. If you mean iscsi_aio_cancel(), isn't > it dead code anyway since we changed block.c to use coroutines for > everything? bdrv_co_io_em() even throws the acb away, so even if you > wanted, there's no way to cancel the request even today.
SCSI tries to use cancellation, and this results in VCPU threads starving all other threads. So I would like to introduce cancellation points for coroutines. Paolo
