Re: [PATCH 0/2] Postcopy migration and vhost-user errors

[Prasad Pandit]

Hi,

On Tue, 23 Jul 2024 at 10:33, Prasad Pandit <ppandit@redhat.com> wrote:
> On Sun, 21 Jul 2024 at 01:11, Michael S. Tsirkin <mst@redhat.com> wrote:
> > > > > On Wed, Jul 17, 2024 at 04:55:52AM -0400, Michael S. Tsirkin wrote:
> > > > > > I just want to understand how we managed to have two threads
> > > > > > talking in parallel. BQL is normally enough, which path
> > > > > > manages to invoke vhost-user with BQL not taken?
> > > > > > Just check BQL taken on each vhost user invocation and
> > > > > > you will figure it out.
> > > > >
> > > > OK, so postcopy_ram_ things run without the BQL?
>
> I'll check the postcopy_ram_* functions to see what's happening there.
===
2024-07-23T17:11:25.934756Z qemu-kvm: vhost_user_postcopy_end:
161184:161213: BQL not taken
2024-07-23T17:11:25.934994Z qemu-kvm: vhost_user_postcopy_end:
161184:161213: BQL not taken
2024-07-23T17:11:25.935095Z qemu-kvm: vhost_user_postcopy_end:
161184:161213: BQL not taken
===
* postcopy_ram_listen_thread() does not take the BQL. Trying to see
where to take it.

Thank you.
---
  - Prasad