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

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Message-ID: <ZswgHTRUR-wstAHf@infradead.org>
Date: Sun, 25 Aug 2024 23:26:37 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Jason Wang <jasowang@...hat.com>
Cc: Christoph Hellwig <hch@...radead.org>, Cindy Lu <lulu@...hat.com>,
	mst@...hat.com, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

On Mon, Aug 26, 2024 at 02:21:52PM +0800, Jason Wang wrote:
> > What is the application visible behavior that the API use is the proxy
> > for?
> 
> Vhost used to be created by kthreadd but some recent patches change it
> to behave like being froked by the owner. So the various attributes
> that interhit from the parent has been changed (scheduling and
> namespace etc).

Well, if that breaks userspace it needs to be changed to opt into the
new behavior rather than requiring a flag to not break the existing
applications.  Assuming the change is intentional to start with.