On Thu, Sep 21, 2023 at 11:34:43AM -0500, Stuart Hayes wrote:
Shut down devices asynchronously, ensuring that each device is shut down
before its parents.
This can dramatically reduce system shutdown/reboot time on systems that
have devices that take many seconds to shut down, such as some NVMe drives.
On one system tested, the shutdown time went from 11 minutes without this
patch to 55 seconds with the patch.
That's a nice improvement, but I think we need a lot more testing on a
wide range of systems before we can take a patch like this.
Also, what about busses that don't want this type of shutdown? We allow
busses to opt-in for async probing, shouldn't that be also done for
shutting them down to resolve issues for busses that can not handle
this?
thanks,
greg k-h