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

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Message-ID: <881d2462-895c-4ee6-a530-957a8dbac072@lunn.ch>
Date: Tue, 28 Oct 2025 22:14:29 +0100
From: Andrew Lunn <andrew@...n.ch>
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
Subject: Re: [PATCH v2] vhost: add a new ioctl VHOST_GET_VRING_WORKER_INFO
 and use in net.c

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