On Thu, Oct 27, 2011 at 03:26:23PM +0200, Kevin Wolf wrote: > Am 19.09.2011 16:37, schrieb Frediano Ziglio: > > Now that iothread is always compiled sending a signal seems only an > > additional step. This patch also avoid writing to two pipe (one from signal > > and one in qemu_service_io). > > > > Work with kvm enabled or disabled. strace output is more readable (less > > syscalls). > > > > Signed-off-by: Frediano Ziglio <fredd...@gmail.com> > > Something in this change has bad effects, in the sense that it seems to > break bdrv_read_em.
How does it break bdrv_read_em? Are you seeing QEMU hung with 100% CPU utilization or deadlocked? One interesting thing is that qemu_aio_wait() does not release the QEMU mutex, so we cannot write to a pipe with the mutex held and then spin waiting for the iothread to do work for us. Exactly how kill and qemu_notify_event() were different I'm not sure right now but it could be a factor. Stefan
