[PATCH V2 05/12] nvmet: use unlikely for uncommon commands

[Christoph Hellwig]

On Mon, Aug 31, 2020 at 03:27:00PM -0700, Chaitanya Kulkarni wrote:
> I/O commands (nvme_cmd_read, nvme_cmd_write) are most common commands
> when accessing passthru controller, most controllers should not
> have set the effects for r/w I/O commnds (atleast I don't know at this
> moment). Also, check for req->p.use_workqueue is true in two admin
> commands only which are low frequency commands.
> 
> Annotate use_workqueue and command effects check with unlikely in the
> fast path.

What difference does this make?