On Tue, Jul 06, 2021 at 04:45:30PM +0800, Ming Lei wrote:

quoted

/sys/kernel/debug/block/nvme0c0n1# find . -type f -exec grep -aH . {} \;

It is the mpath device's debugfs, what is output for the nvmef's
debugfs?

Do you mean /sys/kernel/debug/block/{nvme0n1,nvme0n2}? These are
directories are empty.

There is only /sys/class/nvme/nvme0, but I don't think this is what you
are asking for.