Re: [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

[Cindy Lu]

On Wed, 21 Aug 2024 at 13:07, Christoph Hellwig <h...@infradead.org> wrote:
>
> On Mon, Aug 19, 2024 at 05:27:33PM +0800, Cindy Lu wrote:
> > Add a new UAPI to support setting the vhost device to
> > use kthread mode. The user space application needs to use
> > VHOST_SET_USE_KTHREAD to set the mode. This setting must
> > be set before VHOST_SET_OWNER is set.
>
> Usage of an API is a complete kernel internal detail that has absolutely
> no business being exposed to applications.
>
> What is the application visible behavior that the API use is the proxy
> for?
>
The userspace application may need to know the details of the kernel.
For example, some userspaces may use a script to track threads. If
they use task mode, the script may not work properly. In that case,
they can choose Kthread mode.
Thanks
Cindy
>