On 10/3/24 2:48 PM, Keith Busch wrote:
The only "bonus" I have is not repeatedly explaining why people can't use h/w features the way they want.
Hi Keith, Although that's a fair argument, what are the use cases for this patch series? Filesystems in the kernel? Filesystems implemented in user space? Perhaps something else? This patch series adds new a new user space interface for passing hints to storage devices (in io_uring). As we all know such interfaces are hard to remove once these have been added. We don't need new user space interfaces to support FDP for filesystems in the kernel. For filesystems implemented in user space, would using NVMe pass-through be a viable approach? With this approach, no new user space interfaces have to be added. I'm wondering how to unblock FDP users without adding a new controversial mechanism in the kernel. Thanks, Bart.
