netdev - Re: [PATCH v2] vhost: add a new ioctl VHOST_GET_VRING_WORKER

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Message-ID: <CAPpAL=yN9QLc2svWrtWutvjzXOCgKWLc9smh9RNPS1=hK_Ug8Q@mail.gmail.com>
Date: Wed, 5 Nov 2025 00:41:31 +0800
From: Lei Yang <leiyang@...hat.com>
To: Nick Hudson <nhudson@...mai.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Eugenio Pérez <eperezma@...hat.com>, 
	Max Tottenham <mtottenh@...mai.com>, kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2] vhost: add a new ioctl VHOST_GET_VRING_WORKER_INFO and
 use in net.c

Tested this patch with virtio-net regression tests, everything works fine.

Tested-by: Lei Yang <leiyang@...hat.com>

On Wed, Oct 29, 2025 at 5:14 AM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Tue, Oct 28, 2025 at 03:28:54PM +0000, Nick Hudson wrote:
> > The vhost_net (and vhost_sock) drivers create worker tasks to handle
> > the virtual queues. Provide a new ioctl VHOST_GET_VRING_WORKER_INFO that
> > can be used to determine the PID of these tasks so that, for example,
> > they can be pinned to specific CPU(s).
>
> Could you add something about the lifetime of the PID. How do you know
> the PID still belongs to the worker by the time you come to use it?
>
>         Andrew
>