linux-kernel - Re: [RFC 2/7] vhost: Add kthread support in function vhost_worker

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Message-ID: <CACLfguUrEAEena_43od1MCyr+B9SJfx+Wj6XyL4b-yZasrkzrg@mail.gmail.com>
Date: Wed, 28 Aug 2024 17:32:57 +0800
From: Cindy Lu <lulu@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: mst@...hat.com, linux-kernel@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC 2/7] vhost: Add kthread support in function vhost_worker_queue()

On Tue, 27 Aug 2024 at 10:36, Jason Wang <jasowang@...hat.com> wrote:
>
> On Mon, Aug 19, 2024 at 5:29 PM Cindy Lu <lulu@...hat.com> wrote:
> >
> > Added back the previously removed function vhost_worker_queue() and
> > renamed it to vhost_worker_queue_khtread(). The new vhost_worker_queue()
> > will select the different mode based on the value of the parameter.
> >
> > Signed-off-by: Cindy Lu <lulu@...hat.com>
>
> It looks like a partial revert of some previous commit, please mention
> the commit id in the change log as least.
>
> So did for the following 3 or 4 patches.
>
> Thanks
>
sure, will add this
Thanks
cindy
> > ---
> >  drivers/vhost/vhost.c | 30 ++++++++++++++++++++++++++++--
> >  drivers/vhost/vhost.h |  1 +
> >  2 files changed, 29 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> > index da701f6b3f2c..6261c9df468e 100644
> > --- a/drivers/vhost/vhost.c
> > +++ b/drivers/vhost/vhost.c
> > @@ -236,8 +236,8 @@ void vhost_poll_stop(struct vhost_poll *poll)
> >  }
> >  EXPORT_SYMBOL_GPL(vhost_poll_stop);
> >
> > -static void vhost_worker_queue(struct vhost_worker *worker,
> > -                              struct vhost_work *work)
> > +static void vhost_worker_queue_task(struct vhost_worker *worker,
> > +                                   struct vhost_work *work)
> >  {
> >         if (!test_and_set_bit(VHOST_WORK_QUEUED, &work->flags)) {
> >                 /* We can only add the work to the list after we're
> > @@ -249,6 +249,32 @@ static void vhost_worker_queue(struct vhost_worker *worker,
> >         }
> >  }
> >
> > +static void vhost_work_queue_kthread(struct vhost_worker *worker,
> > +                                    struct vhost_work *work)
> > +{
> > +       if (!worker)
> > +               return;
> > +
> > +       if (!test_and_set_bit(VHOST_WORK_QUEUED, &work->flags)) {
> > +               /* We can only add the work to the list after we're
> > +                * sure it was not in the list.
> > +                * test_and_set_bit() implies a memory barrier.
> > +                */
> > +               llist_add(&work->node, &worker->work_list);
> > +
> > +               wake_up_process(worker->task);
> > +       }
> > +}
> > +
> > +static void vhost_worker_queue(struct vhost_worker *worker,
> > +                              struct vhost_work *work)
> > +{
> > +       if (use_kthread) {
> > +               vhost_work_queue_kthread(worker, work);
> > +       } else {
> > +               vhost_worker_queue_task(worker, work);
> > +       }
> > +}
> >  bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work)
> >  {
> >         struct vhost_worker *worker;
> > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> > index bb75a292d50c..c7f126fd09e8 100644
> > --- a/drivers/vhost/vhost.h
> > +++ b/drivers/vhost/vhost.h
> > @@ -27,6 +27,7 @@ struct vhost_work {
> >  };
> >
> >  struct vhost_worker {
> > +       struct task_struct      *task;
> >         struct vhost_task       *vtsk;
> >         struct vhost_dev        *dev;
> >         /* Used to serialize device wide flushing with worker swapping. */
> > --
> > 2.45.0
> >
>